Fume Hoods and Enclosures

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(Video) Fume Hood Safety

"; if(!false){ availabilityStatus += ""; } }else if(item.quantityAvailable == 0 && item.availabilityDisplayText ==''){ availabilityStatus = "

" + availabilityStatus + "

"; }else{ availabilityStatus = "

" + availabilityStatus + "

"; } $("#lowestSKUAvailability_"+jqEscapeId(item.skuId)).html(availabilityStatus); } if(item.availabilityDisplayText == 'Direct from Supplier'){ if ("true" == item.available) { availabilityStatus = "

In Stock at Supplier

(Video) Fume Hoods Going Behind the Scenes with the Industry's Latest Technology

"; $("#lowestSKUAvailability_"+jqEscapeId(item.skuId)).html(availabilityStatus); }else{ if (thridPartyAvailabilityParam == "") { thridPartyAvailabilityParam = item.skuId + "~1"; } else { thridPartyAvailabilityParam += "," + item.skuId + "~1"; } } } replaceText = /*availabilityStatus +"-" + */ (contractPriceAllowed ? (item.salePrice) : item.listPrice); // Display the PROMO / Sale price ONLY if the site is Bio express and PROMO is availableif(false){if(item.clearancePriceEnabled == 'true' && item.promoPrice !="" && item.promoPriceUsed == 'true'){ var clearance = ''; if(true){ clearance = "(Clearance)";} replaceText = item.salePrice + clearance;} else if(item.promoPrice !="" && item.promoPriceUsed == 'true'){ var sale = ''; if(true){sale = "(Sale)";} replaceText = item.salePrice + sale;}else if (true && item.expertPrice !="" && item.expertPriceUsed == 'true') { replaceText = '

'+item.listPrice+'

New Customer Promotional Price
' + item.salePrice; replaceTextDropDown = item.salePrice; }} else if(item.promoPrice !="" && item.promoPriceUsed == 'true'){ var sale = ''; if(true){sale = "(Sale)";} replaceText = /* availabilityStatus +"-" + */item.salePrice + sale; }else if (true && item.expertPrice !="" && item.expertPriceUsed == 'true') { replaceText = '

'+item.listPrice+'

New Customer Promotional Price
' + item.salePrice; replaceTextDropDown = item.salePrice; } }else{ if(false){ if(item.clearancePriceEnabled == 'true' && item.promoPrice !="" && item.promoPriceUsed == 'true'){ replaceText = item.salePrice + "(Clearance)"; } else if(item.promoPrice !="" && item.promoPriceUsed == 'true'){ replaceText = item.salePrice + "(Sale)"; }else if (true && item.expertPrice !="" && item.expertPriceUsed == 'true') { replaceText = '

'+item.listPrice+'

New Customer Promotional Price
' + item.salePrice; replaceTextDropDown = item.salePrice; } } else if(item.promoPrice !="" && item.promoPriceUsed == 'true'){ // replaceText = item.salePrice + "(Sale)"; replaceText = item.salePrice + "(Sale)"; } else if (true && item.expertPrice !="" && item.expertPriceUsed == 'true') { replaceText = '

'+item.listPrice+'

New Customer Promotional Price
' + item.salePrice; replaceTextDropDown = item.salePrice; } }// Display the marketSourceItemvar qtyAvailable = item.quantityAvailable;var discontinuedItemStatus = item.discontinuedItemStatus;if(qtyAvailable <= 0 && discontinuedItemStatus != null && discontinuedItemStatus == 'ES') {$("#qtyBox_" + jqEscapeId(item.skuId)).html("");// Show the description text for the call image, else user may not understand by just seeing the call image$('#discontd_desc').show();}if(true && item.marketSourceItem !="" && item.marketSourceItem == 'true'){//var existingText = $("#SALEPRICE_"+jqEscapeId(item.skuId)).html();//var newText = existingText.replace((existingText),"Login For Price");var newText = "Login For Price";$("#SALEPRICE_"+jqEscapeId(item.skuId)).html(newText);$("#ORDERSALEPRICE_"+jqEscapeId(item.skuId)).html(newText);$("#DROPDOWNSALEPRICE_"+jqEscapeId(item.skuId)).html(newText);}else if(item.callForPriceIndicator == 'true'){var inquireForPriceText = $("#zeroPricingDiv").text();var orderPriceText = $("#ORDERSALEPRICE_"+jqEscapeId(item.skuId)).html();var salePriceText = $("#SALEPRICE_"+jqEscapeId(item.skuId)).html();var dropDownPriceText = $("#DROPDOWNSALEPRICE_"+jqEscapeId(item.skuId)).html();if (orderPriceText) {$("#ORDERSALEPRICE_"+jqEscapeId(item.skuId)).html(inquireForPriceText + orderPriceText );} else if (salePriceText) {$("#SALEPRICE_"+jqEscapeId(item.skuId)).html(salePriceText.replace(retrieving,inquireForPriceText));} else {$("#DROPDOWNSALEPRICE_"+jqEscapeId(item.skuId)).html(dropDownPriceText.replace(retrieving,inquireForPriceText));}$("#qtyBox_" + jqEscapeId(item.skuId) + " input").prop('disabled',true);$("#qtyBox_" + jqEscapeId(item.skuId) + " button").prop('disabled',true);}else {// Slightly modifying the below logic to display the pricing in top and ordering grid of HYBRIDvar salePriceText = $("#SALEPRICE_"+jqEscapeId(item.skuId)).html();var orderPriceText = $("#ORDERSALEPRICE_"+jqEscapeId(item.skuId)).html();var dropDownPriceText = $("#DROPDOWNSALEPRICE_"+jqEscapeId(item.skuId)).html();if(item.newProduct == 'true') {$("#newproduct_"+catNum).css("display", "inline");}if(orderPriceText){if(false){if(item.clearancePriceEnabled == 'true' && item.promoPrice !="" && item.promoPriceUsed == 'true'){$("#ORDERSALEPRICE_"+jqEscapeId(item.skuId)).html(''+item.listPrice+'
'+item.salePrice+'');$("#clearance_"+catNum).css("display", "block");}else{$("#ORDERSALEPRICE_"+jqEscapeId(item.skuId)).html(replaceText);}}else{$("#ORDERSALEPRICE_"+jqEscapeId(item.skuId)).html(replaceText);}}else if(salePriceText){var newText = salePriceText.replace((retrieving),replaceText);if($("#SALEPRICE_"+jqEscapeId(item.skuId)).get(0).tagName == 'LABEL'){if(false){if(item.clearancePriceEnabled == 'true' && item.promoPrice !="" && item.promoPriceUsed == 'true'){$("#SALEPRICE_"+jqEscapeId(item.skuId)).html(''+item.listPrice+''+salePriceText.replace((retrieving),''+item.salePrice+''));$("#clearance_"+catNum).css("display", "block");}else{$("#SALEPRICE_"+jqEscapeId(item.skuId)).html(newText);}}else{$("#SALEPRICE_"+jqEscapeId(item.skuId)).html(newText);}}else{if(false){if(item.clearancePriceEnabled == 'true' && item.promoPrice !="" && item.promoPriceUsed == 'true'){$("#clearance_"+catNum).css("display", "block");}}$("#SALEPRICE_"+jqEscapeId(item.skuId)).html(newText);}}else if(dropDownPriceText){var newText = dropDownPriceText.replace((retrieving),replaceTextDropDown);$("#DROPDOWNSALEPRICE_"+jqEscapeId(item.skuId)).html(newText);}}//update the break priceif(item.breakPriceMsg != ''){/* This appends the break price message after regular price and will display the message properly if it has one UoM (we are directly displaying the pricing as label for single UoM). * But these prices will not display if it has drop down as the append happens after selelct box. However this will not be an issue as break price is applicable only for EU * countries and EU has one UoM */$("#SALEPRICE_"+jqEscapeId(item.skuId)).closest('.search_ordering').append($('

',{"class":'breakPricingColumn'}).html(item.breakPriceMsg));// Adding colspan as 10, hence it will span across entire row and we will not have more than 10 columns$("#breakPrice_"+jqEscapeId(item.skuId)).html($('

', {colspan:10, "class": 'breakPricingColumn'}).html(item.breakPriceMsg));// Add the hasBreakPricing style class for the SKU row to show the BP message and sku row as single. $("#orderingRow_"+jqEscapeId(item.skuId)).attr({"class": 'hasBreakPricing'});}if(isIndiaSite && false){$("#avantorprocessedproduct_"+jqEscapeId(item.catalogNumber)).attr("style", "display:inline");}if(false && item.promoValidUpTo != null && item.promoValidUpTo!=''){$("#onsalevalid_"+catNum).attr("style", "display:inline");$("#promovalidupto_"+catNum).html(item.promoValidUpTo);$("#onsale_"+catNum).attr("style", "display:inline");} }); if (thridPartyAvailabilityParam != "") { $.getJSON( '/store/services/pricing/json/thirdPartyAvailability.jsp?skuIds=' + thridPartyAvailabilityParam, function(data){ $.each(data, function(index, item){ if (item.availabilityStatus == 1) { availabilityStatus = "

In Stock at Supplier

"; } else { availabilityStatus = "

(Video) Laboratory Fume Hoods

On Order

"; } $("#lowestSKUAvailability_"+jqEscapeId(item.skuId)).html(availabilityStatus); }); }); } }); } var ua = window.navigator.userAgent; var ie = isIE(ua); $.each($('div').find('select.uomSelect'),function(index,value){var arr = []; $.each(value, function(index, value){arr.push(value);});arr.sort(function(a,b){var aTxt = $(a).find('span').html();var bTxt = $(b).find('span').html(); if(aTxt == 'In Stock'){ return 1; } if(bTxt == 'In Stock'){ return -1; } if(aTxt == 'Direct from Supplier' && (bTxt == 'Backordered' || bTxt == 'Direct from Supplier')){ return 1; }else{ return -1; }});if(ie){ arr.reverse(); }$(value).empty();$(value).append(arr);value.selectedIndex = '0';});function showArticleNumber(localSkuIds){}function isIE(userAgent) { userAgent = userAgent || navigator.userAgent; return userAgent.indexOf("MSIE ") > -1 || userAgent.indexOf("Trident/") > -1;} function getThumbnailHTML(catnum, thumbnail) { var html = ''; return html; } function addComparisonProduct(catnum, thumbnail,thumbUri) { comparisonProducts[comparisonProducts.length] = catnum; comparisonThumbnails[comparisonThumbnails.length] = thumbnail; document.getElementById('compare' + comparisonProducts.indexOf(catnum)).innerHTML = getThumbnailHTML(catnum, thumbnail);redrawComparisonWidget(); var params="add="+catnum+"&thmb="+thumbUri; $.ajax({type:'POST', cache: false, url:'/store/compare', data:params, success:function(data) {}}); } function removeComparisonProduct(catnum, thumbnail) { var idx = comparisonProducts.indexOf(catnum); comparisonProducts.splice(idx, 1); comparisonThumbnails.splice(idx, 1); var params="remove="+catnum; $.ajax({type:'POST', cache: false, url:'/store/compare',data:params, success:function(data) {}}); redrawComparisonWidget(); var buttons = document.getElementsByTagName('input'); for(var i=0; i < buttons.length; i++) { if(buttons[i].id == 'compareButton_' + catnum) { buttons[i].value = 'Add to Compare'; } } }function redrawComparisonWidget() { for(var i=0; i < 4; i++) { document.getElementById('compare' + i).innerHTML = ''; } for(var x=0; x < comparisonThumbnails.length; x++) { //document.getElementById('compare' + x).innerHTML = getThumbnailHTML(comparisonProducts[x], comparisonThumbnails[x]); $("#compare"+ x).html(getThumbnailHTML(comparisonProducts[x], comparisonThumbnails[x])); } //We need to change the below implemenation wrt to Bill's HTMLdocument.getElementById('compareBtn').innerHTML = 'Compare('+comparisonProducts.length+')'; } function toggleComparison(catnum, thumbnail,thumbUri,element) { if(comparisonProducts.indexOf(catnum) > -1) { removeComparisonProduct(catnum, thumbnail); element.value = 'Add to Compare'; } else { if(comparisonProducts.length == 4) { showModal('

You cannot select more than four products for comparison.

'); } else { addComparisonProduct(catnum, thumbnail,thumbUri); element.value = 'Remove from compare'; } } } function clearComparisonProducts() {localStorage.removeItem('backToSearchResultsLink'); $.ajax({type:'GET', cache: false, url:'/store/compare?clear=true', success:function(data) { //Do Nothing }}); var buttons = document.getElementsByTagName('input'); for(var i=0; i < buttons.length; i++) { if(buttons[i].id.substring(0, 13) == 'compareButton') { buttons[i].value = 'Add to Compare'; } } comparisonProducts.length = 0; comparisonThumbnails.length = 0; redrawComparisonWidget(); } function validateComparisonProducts() { if(comparisonProducts.length > 1) {localStorage.setItem('backToSearchResultsLink',window.location.href); window.location='/store/search/productComparison.jsp'; return true; } else { showModal('

You need to select a minimum of two products for comparison.

'); return false; } } function showModal(msg) { $.fancybox.open('

'+msg+'

'); } $(document).ready( function() {redrawComparisonWidget();}); function isNumeric(e) {if(e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) { return false; }} function setBackToSearchPageFromInsights(e){ e.preventDefault(); localStorage.removeItem('backToProductPageLink'); localStorage.setItem('backToSearchResultsFromInsights',window.location.href); } /* $(".search_product_name").click(function(){ universalAnalytics('productClick','ProductLinkClick','HybridView','ProductLinkClick','catalogNumber='+''); }); $(".column-1").click(function(){ universalAnalytics('productClick','ProductImageClick','HybridView','ProductImageClick','catalogNumber='+''); }); */

';$("#showViewCostSavingAlternative_"+response.currentCatalogNumber).html(emptyDiv);}if(response.webOrgEnableAvantorInsightsMostPurchased && response.userEnableAvantorInsightsMostPurchased && response.currentCatalogMostPurchased == 'true'){var mostPurchasedText='

Most Purchased by your Company

';$("#showViewCostSavingAlternative_"+response.currentCatalogNumber).append(mostPurchasedText);}}}});}//Get the cell values based on STIBOif(index == hideIndex){// Add the catalog # and its description explicitly.rowContent.append($('

', {rowspan: rowSpanValue, "class": 'product-head'}).append(catalogNumber).append(description).append('').append('')); $.each( row.rowValues, function( index, rowValue ) {if (columns != null && columns != undefined && columns[index]!= null && columns[index] != undefined) {var columnContent = $('

', {"data-title": columns[index].columnName}).attr({rowspan: rowSpanValue });//Add custom color if its custom catalog, else do nothingcolumnContent = (customColor != '') ? $(columnContent).attr({style: 'color:#' + customColor}) : columnContent;rowContent.append($(columnContent).append( $("

(Video) Labconco Fume Hood Containment

").html(rowValue).text()));}});}//GWE-10034 : passing buyingUomDescription to display in case toggle is ongetSkuCells(rowContent, sku.skuid, sku.uomDisplay, sku.blockingRule,sku.displayPromotion,sku.promoValidUpTo,stockroomText, sku.buyingUomDescription);content.append(rowContent);}});content.append(showViewCostSavingAlternativeEmptyRow);content.append(showViewCostSavingAlternative);content.append(showArticleNumber);// Add break price and discontinued row. These rows will be visible if it has content.content.append(discontinuedRow);content.append(breakPriceRow);});return content;}/** * Method used to uom, price and availability cells. * @param {Object} get the existing cell contents * @param {String} get the skud ID of the product * @param {String} get the UoM text to display. * @param {String} get the blocking rule to impose */function getSkuCells(rowContent, skuId, uomDisplay, blockingRule,displayPromotion,promoValidUpTo,stockroomText,buyingUomDescription){var uom = '';if(true){//GWE-10034 startif(false && buyingUomDescription != null && buyingUomDescription != '' && buyingUomDescription != undefined){uom = $('').html(''+buyingUomDescription);}else{uom = $('').html(''+uomDisplay);}//GWE-10034 end}if(false){rowContent.append($('

').addClass(' search_availability').attr({"data-title":"Availability"}).append($('', {id: 'lowestSKUAvailability_'+skuId, html: ''})).append(stockroomText));} if(true ){showQtyOrBlockingRules(skuId, blockingRule, rowContent,displayPromotion,promoValidUpTo);}//if(true){//rowContent.append($('

').addClass('productGrid product_price').append($('', {id: 'ORDERSALEPRICE_'+skuId, html: ''})).append(uom));//}//if(false){//rowContent.append($('

').addClass('productGrid product_price').append($('', {id: 'ORDERSALEPRICE_'+skuId, html: ''})).append(uom));//}if(true){var sIcon = saleIcon()var validMsg = promoValidMsg(promoValidUpTo);if(false && blockingRule == '' && displayPromotion){rowContent.append($('

').addClass('product_price').attr({"data-title":"Your Price"}).append($('', {id: 'ORDERSALEPRICE_'+skuId, html: ''})).append(uom).append(sIcon).append(validMsg));}else{rowContent.append($('

').addClass('product_price').attr({"data-title":"Your Price"}).append($('', {id: 'ORDERSALEPRICE_'+skuId, html: ''})).append(uom));}}}/** * Method to display Qty text box or blocking rule * @param {String} get the sku id * @param {String} get the blocking rule to impose * @param {Object} get the existing cell contents*/function showQtyOrBlockingRules(skuId, blockingRule, rowContent,displayPromotion,promoValidUpTo){var element = $('

').addClass('input-group input-group-sm input-number-group');var tableCell = ($('

').addClass('')).attr({id:'qtyBox_' + skuId, "data-title":"Quantity"});switch(blockingRule){case 'purchaseHold':element = $('').attr({type:'image', src: '/images/shopping_icons2/icon_call.png', height:'16', width: '16', alt: 'Call', onclick: "javascript:showModal($('#purchaseHold').html())"});tableCell.append(element);break;case 'sellHold':element = $('').attr({type:'image', src: '/images/shopping_icons2/icon_call.png', height:'16', width: '16', alt: 'Call', onclick: "javascript:showModal($('#sellHold').html())"});tableCell.append(element);break;case 'restricted':element = $('').attr({type:'image', src: '/images/shopping_icons2/icon_restricted.png', height:'16', width: '16', alt: 'Restricted Item', onclick: "javascript:showModal($('#restricted').html())"});tableCell.append(element);break; case 'blocked':element = $('').attr({type:'image', src: '/images/shopping_icons2/icon_blocked.png', height:'16', width: '16', alt: 'Blocked', onclick: "javascript:showModal($('#blocked').html())"});tableCell.append(element);break;case 'crossreference':element = $('').attr({type:'image', src: '/images/shopping_icons2/icon_replacement_product.png', height:'16', width: '16', alt: 'Replacement Product', onclick: "javascript:showModal($('#crossreference').html())"});tableCell.append(element);break;default: var elementMinusIcon =$('').attr( {"class":'input-group-btn' });elementMinusIcon.append($('').attr({onclick:'qtyminus(this, event);', type: 'button', value: '-', field: skuId, "class":'input-number-increment btn btn-default btn-number'}));element.append(elementMinusIcon);element.append($('').attr({ type: 'text', maxlength:'4', size: '4', onkeyup:"setQty('" + skuId + "', event)", value:'0', id: 'qty_'+skuId, "class": 'cartquantity form-control input-number', name: skuId,onkeypress: "return isNumeric(event);" }));var elementPlusIcon =$('').attr( {"class":'input-group-btn' });elementPlusIcon.append($('').attr({onclick:'qtyplus(this, event);', type: 'button', value: '+', field: skuId, "class":'input-number-decrement btn btn-default btn-number'}));element.append(elementPlusIcon);tableCell.append(element);addDynamicHiddenElements(skuId);}if(true && blockingRule == '' && displayPromotion){var sIcon = saleIcon();tableCell.append(sIcon);var validMsg = promoValidMsg(promoValidUpTo);tableCell.append(validMsg);}rowContent.append(tableCell);} /** * Method used to set the qty value to hidden element. * The dynamic form elements rendered inside the order table does not populate in form post. Hence adding directly to form as work around. * @param {String} get the skuId * @param {Event} get the Event */function setQty(skuId, event){ skuId = escapeSpecialCharacters(skuId); $('input[name='+skuId+']').val($('#qty_'+skuId).val()); updateCart(event); universalAnalytics('cartquantity', 'QuantityAddsBox', 'HybridView', 'QuantityAddsBox', '')}/** * Method used to add dynamic hidden elements to Order Form. * The dynamic form elements rendered inside the order table does not populate in form post. Hence adding directly to form as work around. * @param {String} get the skuId */ function addDynamicHiddenElements(skuId){$('').attr({type: 'hidden',name: skuId,value: 0}).appendTo('#addToBasket');$('').attr({type: 'hidden',value: skuId,name: '/vwr/search/SearchOrderFormHandler.catalogRefIds'}).appendTo('#addToBasket'); } /** * Method to display the quick view * @param {String} get the catalog number to display the quick view page. */function loadQuickview(catnum,blockedItems) { $.fancybox.showLoading(); $.get('/store/search/productPreview.jsp?catalog_number=' + catnum +'&blockedItems=' + blockedItems, function(data) { $.fancybox(data, { 'width':'auto', 'height':'auto' }); $.fancybox.hideLoading(); } )} function enteredQuantity(){var enteredQty = 0; $("input.cartquantity").each(function(index, element) { if(!isNaN($(element).val())){ enteredQty += +$(element).val(); }}); return enteredQty;} /** * Method to update the cart quantity and this quantity is to remaind the user to make sure to click the add to basket * @param {Event} get the Event */function updateCart(event){var enteredQty = enteredQuantity();var keyCode = undefined;$( "#addToCartButtonQuantity" ).text('Add to Basket ('+ enteredQty +')');if (!event){event = window.event;} keyCode = event.keyCode || event.which; //Change the CSS classif(enteredQty > 0){ //Submit the form if the user presses enter key if(keyCode == 13){// Submit the form addToCartAjax(); } }} /** * Method to display the qunatity and availability container * @param {String} get the catalog number to display the qunatity and availability container */ function showHideQunatityAvailability(selectedCatalog){var selectedSKU = undefined;var skuId = undefined;selectedCatalog = escapeSpecialCharacters(selectedCatalog); selectedSKU = escapeSpecialCharacters($("#unit_"+selectedCatalog+ " option:selected" ).val());$("#unit_"+selectedCatalog+" option").each(function(){skuId = escapeSpecialCharacters($(this).val());//Hide all quantity and avail containers$("#lowestSKUAvailability_"+skuId).attr('class','hide');$("#qtyBox_"+skuId).attr('class','hide');$("#blockedmsg_"+skuId).attr('class','hide');//Clear the Qty text feld$('input[name='+skuId+']').val(0).trigger('change');});//show right container$("#lowestSKUAvailability_"+selectedSKU).attr('class','');$("#qtyBox_"+selectedSKU).attr('class','');$("#blockedmsg_"+selectedSKU).attr('class','');} function saleIcon(){var promoElement = $('

');var promoElementSpan = $('').addClass('sale tag');var promoElementSvg = $('

').addClass('icon');var promoElementUse = $('

').attr('xlink:href', '#tag-icon');promoElementSvg.append(promoElementUse);promoElementSpan.append(promoElementSvg);promoElementSpan.append('On Sale');promoElement.append(promoElementSpan);return promoElement;}function promoValidMsg(promoValidUpTo){var promoValidElement = $('

').addClass('font-size-8');promoValidElement.text('Valid until ').append(promoValidUpTo);return promoValidElement;} function setBackToSearchPageFromInsights(e){e.preventDefault();localStorage.removeItem('backToProductPageLink');localStorage.setItem('backToSearchResultsFromInsights',window.location.href);} //Auto expand the ordering tables$(document).ready(function(){expandOrdertables();});

FAQs

How many inches inside the face of a fume hood must all equipment be placed and operations conducted? ›

Keep all equipment and materials at least 6 inches behind the plane of the sash (hood face), this will improve containment capture. A stripe (tape) on the hood working surface is a good reminder. Place all bulky equipment away from the sidewalls to allow air flow around the equipment.

Tell Me More ›

What is the maximum opening height for fume hoods during work? ›

Types of fume hoods

Standard flow fume hoods are designed to operate at 100 linear feet per minute (LFM) at 18 inches sash height. (Note that some legacy hoods were designed to operate at 100 LFM at full sash height, as high as 25 inches). Low flow fume hoods are designed to operate at 70 LFM at 18 inches sash height.

Keep Reading ›

What is the ventilation rate for fume hoods? ›

The recognized acceptable minimum volumetric rate (CFM) of air for fume hood exhaust is typically cited from National Fire Protection Association's NFPA 45 recommendation of 25 CFM per interior square foot of work area.

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When using a fume hood all work is performed a minimum of 6 inches from the front edge? ›

Conduct all work at least 6 inches inside of the hood. The capture ability of a fume hood is reduced at the front edge of the hood because of air turbulence. Always wear splash goggles, and use a full face shield if there is possibility of an explosion or eruption. Wear gloves appropriate for the materials being used.

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What is the minimum distance inside a fume hood needed to safely set up an experimental apparatus? ›

Conduct all work and keep all apparatus at least 6 inches back from the face of the hood.

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What are the requirements for a fume hood? ›

Average air velocity at the hood face must be at least 80 linear feet per minute (fpm), with a minimum of 60 fpm at any measured point. If regulated carcinogens are to be used, an average air velocity of 100 fpm should be maintained with a minimum of 80 fpm at any measured point.

See Details ›

What is the minimum face velocity of a fume hood? ›

It is generally recommended that a fume hood's face velocity is between 0.3 m/s (60 fpm) and 0.5 m/s (100 fpm), however, it is best to check with local safety regulations because variations exist by state and use. Several organizations have adopted fume hood safety standards as it relates to face velocity.

What is the recommended maximum sash height for operating a chemical fume hood safely? ›

4. Work with the fume hood sash in the lowest possible position no higher than 18 inches. Keep the sash clean and clear. The sash will act as a physical barrier in the event of an accident inside the fume hood.

Read The Full Story ›

Is the minimum proper fume hood face velocity 100 FPM? ›

For a typical fume hood, the optimum face velocity is no less than 100 feet per minute (fpm). In the case of low-flow, high-efficiency fume hoods, the acceptable face velocity is no less than 80 fpm. (NOTE: Document all alarm events for low-flow, high- efficiency fume hoods.

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What is the OSHA standard for fume hoods? ›

OSHA's Laboratory standard (29 CFR 1910.1450) requires that fume hoods be maintained and function properly when used. Before using a fume hood: Make sure that you understand how the hood works. You should be trained to use it properly.

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How many CFM per person? ›

Derives the ventilation rate from the number of people that will occupy the space at any given time. Example: For an office, the recommended ventilation rate is 20 cfm per person. The occupancy of a general office is one person per 80 to 150 sq. ft.

Learn More Now ›

How many air changes per hour for fume hood? ›

When attempting to save energy in typically higher hood density installations, minimum fume hood flow rates in the range of 150 to 375 hood air changes per hour (ACH) have been used to control vapor concentrations inside hood interiors.

Which steps must be carried out in the fume hood and why? ›

Here are five golden rules of fume hood lab safety to follow:

Perform Safety Measures BEFORE Using A Fume Hood. ...
Always Think Safety During Use. ...
Avoid Storing Chemicals In A Fume Hood. ...
Make Sure Employees Are Up To Date On Training. ...
Have A Contingency Plan In Place.

Oct 15, 2020

Find Out More ›

What is the standard air flow for fume hood? ›

Air volume passing through a fume hood is generally equal to the area of the sash opening multiplied by the average velocity desired. For example, if 100 feet per minute (fpm) is required and the hood has a sash opening of 7.5 square feet, then the hood's air volume is 750 (7.5 x 100) cubic feet per minute (CFM).

Get More Info ›

What are the EPA performance requirements for laboratory fume hoods? ›

The EPA Performance Requirements for Laboratory Fume Hoods document includes criteria for chemical fume hoods operating at an average face velocity of 100 fpm for typical chemical fume hoods, and 60 fpm for low-velocity chemical fume hoods.

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How often should fume hoods be calibrated? ›

TSS recommends installing an audible and visual airflow alarm to indicate whether the fume hood is safe to operate if one is not already present. This should be calibrated on an annual basis at a minimum.

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What is the OSHA Hood velocity requirements? ›

OSHA: “General air flow should not be turbulent and should be relatively uniform throughout the laboratory, with no high velocity or static areas; air flow into and within the hood should not be excessively turbulent; hood face velocity should be adequate. (Typically 60-110 fpm.)”

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How do you check the flow rate of a fume hood? ›

Process:

Turn on hood.
Check the vaneometer. ...
Match red arrow on sash with red arrow on the side panel of the hood.
To acquire reading hold vaneometer in the center of the hood.
Acceptable standard -Chemical fume hoods should operate at a face velocity of (80-120) Linear Feet Per Minute.

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What is the capture velocity for fume? ›

Recommended capture velocities for exterior hoods designed to control welding fumes are in the range of 100–170 fpm (66).

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What is the minimum hood clearance? ›

In most states in the USA, the average height from the top of the cooking range to the bottom of the range hood is 18”, and it is the minimum height clearance required by most building codes.

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What are the face velocity requirements for Ashrae fume hood? ›

Low flow Fume Hoods may be used at NIH as long as they meet ALL the requirements as outlined in the NIH / ASHRAE 110 Modified Fume Hood Testing Protocol. The face velocity of low flow hoods should NEVER be below 0.41 m/s (80 fpm).

What is the fume hood face velocity measurement guideline? ›

In general, a hood's face velocity is recommended to be between 0.3 m/s (60 fpm) and 0.5 m/s (100 fpm), however it is important to check with local safety regulations on the face velocity recommendation before using the fume hoods.

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What is the minimum CFM of a flow hood? ›

To power your range hood, you need at least 100 CFM for every 10,000 BTUs of your stovetop. For example, a 100,000 BTU stove needs at least a 1000 CFM range hood. For electric stoves, multiply the stove width by 10. So, for a 42” electric stove you want a range hood with at least 420 CFM.

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What is the minimum type of respirator required by OSHA? ›

Approved respirators: full facepiece pressure demand self-contained breathing apparatus (SCBA) certified by NIOSH for a minimum service life of thirty minutes, or. combination full facepiece pressure demand supplied-air respirator (SAR) with auxiliary self-contained air supply.

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What is the OSHA welding fume exposure limit? ›

Cr(VI) fume is highly toxic and can damage the eyes, skin, nose, throat, and lungs and cause cancer. . OSHA regulates worker exposure to Cr(VI) under its Chromium (VI) standard, 29 CFR 1910.1026 and 1926.1126. . OSHA's Permissible Exposure Limit (PEL) for Cr(VI) is 5 µg/ m3 as an 8-hour time-weighted average.

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What is the CSI code for fume hood? ›

CSI 11 53 13 Laboratory Fume Hoods & ventilation systems.

How many air changes per hour? ›

ASHRAE (formerly called the American Society of Heating, Refrigerating and Air-Conditioning Engineers) recommends (in its Standard 62.2-2016, "Ventilation and Acceptable Indoor Air Quality in Residential Buildings") that homes receive 0.35 air changes per hour but not less than 15 cubic feet of air per minute (cfm) per ...

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Is 50 CFM enough? ›

A 50 CFM rating is recommended as a minimum for bathrooms 50 sq. ft. and smaller. Larger bathrooms require additional ventilation capacity.

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What is the rule for CFM? ›

This rule is a quick way to approximate the cooling load for a room or building and may be helpful in estimating room air quantities. For example, to estimate the number of tons required to cool a 1,600-sq-ft home, multiply 1,600 by 1 cfm/sq ft to get 1,600 cfm of air.

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What does 10 air changes per hour mean? ›

What is Air Changes Per Hour? Air Changes per Hour is a measurement of how many times a volume of air within a room will be added, removed, or exchanged with filtered clean air. It's also referred to as “air exchange rate” or “air change rate” and is abbreviated to ACH or ACPH.

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How much cubic feet of air do you need to prevent fume hazardous? ›

Fifteen (15) cubic feet per minute (cfm) per person (this may be less in older buildings); Fifteen hundredths (0.15) cfm per square foot of conditioned floor space; or. The amount of air necessary to operate exhaust ventilation systems in the building such as restroom, kitchen and local exhaust systems.

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How often should you clean a fume hood? ›

If your hood isn't used often, clean it immediately afterward. Ducted fume hoods used with low-risk chemicals can go months without a clean. Fume hoods used for dangerous or varied processes need cleaning after every use.

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What is the face of fume hood? ›

The face is the imaginary plane between the bottom of the sash and the work surface. This is the opening in which air is pulled from the lab into the hood. It serves as the entry point for hands to enter the work area. Across this imaginary plane is where face velocity is measured using an appropriate monitor.

What is the recommended velocity for ventilation? ›

Recommended air velocities in ventilation ducts

Service	Recommended Maximum Velocity - v -
Service	Public buildings	Industrial plant
Air intake from outside	2.5 - 4.5	1000 - 1200
Heater connection to fan	3.5 - 4.5	1000 - 1400
Main supply ducts	5.0 - 8.0	1200 - 2400

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Fume Hoods and Enclosures | VWR (2023)

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FAQs

How many inches inside the face of a fume hood must all equipment be placed and operations conducted? ›

How many CFM per person? ›

What are the face velocity requirements for Ashrae fume hood? ›

How much cubic feet of air do you need to prevent fume hazardous? ›

What is the recommended velocity for ventilation? ›

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