Used Fume Hoods for Sale
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About Used Fume Hoods
A fume hood pulls solvent vapor or fine dust away from a person working at a bench. The sash sets the opening, and air moves through that opening into a filter or into a duct. A ductless cabinet cleans the air with carbon, a HEPA filter or both, and sends it back into the room. A ducted cabinet pushes the air outside and needs a fan, a stack and makeup air the building has to supply. The chemical or the dust decides which path is honest. A cabinet that recirculates the wrong vapor is worse than an open bench, because the fan makes the room feel protected while the hazard stays in it.
Solvents and odors point to carbon, or to a duct, when the volume is high and a bed would load too fast. Fine dust points to HEPA. A carbon bed alone will not stop a powder. SEFA's laboratory hood standard puts the widely used average face velocity in a band of about 60 to 100 feet per minute at the sash height people will actually work, with the readings across the opening staying within about 20 percent of that average. A number taken with the sash nearly closed does not describe the opening you will use. Width has to clear the task, a mold wipe-down or a small solvent pour. A wider opening needs more air for the same velocity.
Put the cabinet where the solvent or the dust is produced, not in an empty corner. It is one bench tool. It does not ventilate a molding hall, and it does not stand in for a dust collector on a grinder or a paint booth for spraying parts. Cross-drafts from a nearby door or a supply diffuser can wreck containment even when the fan is healthy. ASHRAE's hood test separates a unit as the builder made it from the same unit after it is installed and after people have loaded the work surface. Makeup air matters on a ducted unit, because air that leaves has to be replaced or the room goes negative. A ductless unit skips the stack and still needs a filter schedule you can reach, or the carbon bed expires while the blower keeps running.
Look through the sash of a used fume hood and open the filter housing before you treat the shell as ready. A saturated carbon bed or a split HEPA filter can sit behind a fan that still spins. The sash should travel and stay where you leave it. Cracks in the work surface matter if you will pour or wipe on that deck.
Meadoworks ships these cabinets from labs and plant rooms through consignments and auctions. The fan, the filters and the duct collar can be checked before you commit, and ordinary freight is the usual move rather than a machinery trailer. A dead blower is the whole failure, even when the paint is fresh.
How to Choose a Used Fume Hood
Ductless vs Ducted Fume Hood
A ductless cabinet filters and returns the air. It suits a defined solvent or dust, a room where you cannot cut a stack, and a workload the filter can actually keep up with. Carbon holds many vapors. A HEPA bed holds fine dust. A ducted cabinet sends air outside. It suits higher volumes and chemicals you do not want stored in a carbon bed in the room.
The building decides as much as the chemistry. No stack and no makeup air, and a ducted plan stalls. A ductless plan with the wrong filter stalls in a quieter way: the fan still runs, and the vapor does not stay in the hood. SEFA asks for a face-velocity monitor on ductless cabinets and a check at least yearly.
How to Size a Fume Hood
Size the opening first. The sash width and the working height have to clear the bench task, and the face velocity through that opening is what keeps vapor out of the breathing zone. SEFA cites a widely used average of about 60 to 100 feet per minute at the sash height you will actually use, with readings across the face within about 20 percent of that average. A wider opening needs more air for the same velocity.
Then match the filter or the duct to the contaminant. Carbon for many solvents. HEPA for fine dust. A duct and a fan when the load is too heavy for a bed. Leave a way to change the filter without dismantling the bench. A hood that cannot be serviced will be bypassed.
Fume Hood Specs to Compare
| Spec | Typical range | Why it matters |
|---|---|---|
| Air path | Ductless returns cleaned air to the room. Ducted sends it outside and needs a stack plus makeup air the room can spare. | |
| Filter type | Carbon holds many solvent vapors. HEPA catches fine dust. The wrong bed leaves the hazard in the room. | |
| Sash opening | The opening is the work zone. A hood that is too narrow gets used with the sash in the wrong place. | |
| Face velocity | 60 to 100 fpm | Velocity through the real opening is what keeps vapor back. A number at a nearly closed sash does not count. |
| Fan location | The fan has to pull the opening you sized. A tired blower is a quiet hood that does not capture. | |
| Work surface | The deck has to accept a wipe-down or a small pour without blocking the rear airflow slot. |
Air path
Ductless returns cleaned air to the room. Ducted sends it outside and needs a stack plus makeup air the room can spare.
Filter type
Carbon holds many solvent vapors. HEPA catches fine dust. The wrong bed leaves the hazard in the room.
Sash opening
The opening is the work zone. A hood that is too narrow gets used with the sash in the wrong place.
Face velocity
Typical range: 60 to 100 fpm
Velocity through the real opening is what keeps vapor back. A number at a nearly closed sash does not count.
Fan location
The fan has to pull the opening you sized. A tired blower is a quiet hood that does not capture.
Work surface
The deck has to accept a wipe-down or a small pour without blocking the rear airflow slot.
What to Inspect on a Used Fume Hood
Identify ducted or ductless
A filter door means recirculation. A collar for duct means the building must finish the exhaust path.
Inspect carbon and HEPA
A saturated carbon bed or a split HEPA filter moves air and does not clean it. Open the housing.
Run the fan
The blower should pull through the sash you will actually use. A weak fan is the whole failure.
Move the sash
The sash should travel and stay where you leave it. A dropped sash is a guard that no one will use.
Check the work opening
Confirm the width clears the bench task at the sash height people will actually work.
Look at the work surface
Cracks and swelling from old solvent matter if you will pour or wipe on that deck.
Confirm power and duct
Match the fan voltage, and on a ducted unit confirm you have a path and makeup air in the room.
Related Equipment
- Shop & Facility Equipment
Totes, hoppers and floor care beside hoods
- Additional Equipment
Other gear around the production floor
Common Applications
Frequently Asked Questions
How do I choose a ductless or ducted fume hood?
Choose ductless when the contaminant is known, the filter matches it, and you cannot or should not cut a stack through the building. Carbon covers many solvent vapors. HEPA covers fine dust. Choose ducted when the volume is high or you do not want that load sitting in a filter in the room. Ducted only works if the building can take the exhaust and replace the air. A fan that returns the wrong vapor to the room is not capture. It is a mixer with a cabinet around it.
How do I size a fume hood for solvents?
Size the sash opening to the work, then keep enough air moving through that opening to hold vapor out of the breathing zone. A widely used average is about 60 to 100 feet per minute at the sash height you will actually use. A wider opening needs more airflow for the same capture. For many solvents the filter is carbon, or the air goes outside if the load would exhaust a bed too quickly. Dust is a different filter. Do not size a solvent hood with a hopper rating.
What should I inspect on a used fume hood?
Open the filter housing. A saturated carbon bed or a damaged HEPA filter can sit behind a fan that still spins. Run the blower and feel the pull at the sash you will actually use. The sash should move and stay put. Look at the work surface for solvent damage. Confirm whether the unit is ductless or needs a duct you do not have. Voltage on the fan has to match the bench circuit. A quiet cabinet with a dead blower is not a bargain.
Is a fume hood the same machine as a paint booth?
No. A fume hood is a bench cabinet for vapor or dust at arm's reach. A paint booth is a room-scale enclosure with its own airflow, filtration and fire rules. Using a bench hood as a spray booth overloads the filter and does not contain overspray. If the job is wiping molds with solvent or pouring a small quantity, a hood can be the right tool. If the job is spraying parts, you are shopping a different machine.
Which filter does a fume hood need for dust versus vapor?
Fine dust wants a HEPA filter. A carbon bed is for vapors and odors, and it will not stop a powder. Some cabinets take both, carbon and HEPA, when the bench sees solvent and dust. Read the housing, not the outside label alone. A ducted hood can skip the room-side filter only because the air leaves the building, and that still needs a fan and a real exhaust path. Match the filter to the contaminant before you match the cabinet width.
Where should a fume hood sit relative to the bench?
Put it at the bench where the solvent or the dust is produced, not in a corner because the corner was empty. The sash height you plan to work at is the height that has to capture. Keep cross-drafts from doors and supply diffusers off the face. It does not ventilate the whole hall, and it does not replace a dust collector on a grinder. Makeup air matters if the hood is ducted. A ductless hood still needs a filter change you can actually reach.
