Ducted Fume Hoods vs Ductless Fume Hoods

Corporations use laboratories inside of a multitude of means lately. And, with tight budgets, constrained sq. footage, changing company dynamics and basic safety criteria involved, enterprises occasionally battle On the subject of purchasing lab home furniture.

Just one significant conclusion comes when it’s time to buy a chemical fume hood on your new laboratory or through a redesign.

And, Enable’s be sincere, the stakes could be large. Just look into this information a few tragic laboratory incident at UCLA to begin to see the probable outcomes of Doing work inside of a fume hood.

Here we glance at your choices...a ducted fume hood or a ductless fume hood?

The Regular – Ducted Fume Hood
Ducted fume hoods have ventilated enclosures, function within the framework of one's setting up infrastructure and pull contaminants out within your setting up in the HVAC system.

Ducted fume hoods have a base, work surface, hood, blower and ducting that carries the air outside of the building. The engineer of your heating, air flow and air-conditioning (HVAC) program demands to find out Should your area has ample air to supply the required volume of ventilation to the hood.

The upkeep of your fume hood is done as Section of the constructing's servicing, and is usually carried out by These in charge of the mechanical systems.Typically, the upkeep or Environmental Wellbeing and Security team manage any difficulties.

Your HVAC engineer can get the job done along with your team to deliver best air provide and balance, to make sure that anything functions properly in the fume hood.

Ducted fume hoods are regarded most secure for staff in laboratories, and its usually the easiest for businesses to keep up. Lots of universities ONLY make it possible for ducted fume hoods within their amenities to keep up worker and scholar security.


Safer for lab personnel
Can take care of many different chemicals
Uncomplicated to function and manage
Minor to no contamination in lab

More difficult to set up
Stationary within the lab
More challenging to move or relocate
Use far more energy

The choice – Ductless Fume Hoods
Ductless fume hoods operate off a carbon filter procedure that recirculates filtered air into your creating. Ductless hoods will often be called re-circulating vary hoods. They filter the air then return the clean air back again into the workspace. They can be self-contained filtered laboratory enclosures. Their primary capabilities are mobility, they conserve Vitality, are quick to put in and much less expensive since no ductwork is necessary.

The disadvantage is always that personnel are at a increased risk of chemical exposure, filter servicing is required, they are often noisy resulting from the internal blower and you can find limited programs for filter selections.

Ductless fume hoods are ideal for labs that call for mobility, cope with light to moderate chemical masses and are seeking a cost-successful possibility from each an set up and operational standpoint.


Less expensive
Simple to set up
Cell in the lab
Very easily moved or relocated
Use a lot less energy
Down sides

Handles Minimal substances
Need to exchange filters
Not as powerful at taking away chemical fumes
Not for constant use

How Do I Choose?
There are lots of inquiries that needs to be requested to ascertain the MOST appropriate fume hood to your laboratory task - ducted or ductless.

Here are a few:

Do you're employed with in excess of ten distinctive substances?
Are you currently working with tiny or massive volumes of chemical compounds?
Does your lab Use a significant quantity of inexperienced people today dealing with substances, for instance a College lab?
Does your building have an HVAC method along with a group to handle it?
Is mobility necessary for your operation?
Do you have got techs that will thoroughly retain a procedure, e.g. changing out filters?
Will the chemical compounds you will be working with sufficiently filter by way of carbon?
Answering these questions about how you work with chemicals in your lab can help you identify the suitable application for your needs.

Laboratory safety and workload need to be the first selecting components as part of your final decision. In a very ductless fume hood, there must be no Intense heating, not more than ten chemical substances ought to be used for every application, tiny volumes of chemical compounds must be employed (close to five hundred mls or considerably less) and exposure time should be within just 2-three hrs every day.

There are a range of filters which have diverse chemical trapping capacities, but In case your software doesn’t match offered filters you’ll be required to shift forward with a ducted fume hood. Talk with your fume hood supplier about the various filters for chemical teams.

Finally, identify how often you will be changing your carbon filter, this may also offer you a a lot more exact fiscal cost. Remember the fact that the filter existence depends on the chemical compounds utilized, evaporation amount, chemical volume, length of usage along with the temperature of the chemical compounds.


It is important to ensure that you've the appropriate fume hood for the lab software, as the security within your function and also your workers is at stake.

It is usually best to consult with a professional fume hood manufacturer, so that your lab would not go up in smoke!

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