Wall-Mounted Exhaust Arms — Perimeter Lab Ventilation
Wall-mounted exhaust extraction arms for laboratory perimeter benches. 3’–6′ reach. Swing-away design. Free design.
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Wall-Mounted Exhaust Arms
Wall-mounted extraction arms anchor to the wall above perimeter benches and casework, providing point-source ventilation that swings into position for use and swings away for clearance. They connect to building exhaust through wall penetrations or overhead ductwork.
Standard reach is 3’–6′ from the wall mount. Arms include 180°+ swing range, self-supporting positioning, and capture hoods from 4″ to 8″ diameter.
How Wall-Mounted Exhaust Arms Protect a Bench
A wall-mounted exhaust arm bolts to the wall above a perimeter bench and swings into position over the work when it is needed. The hood captures fumes, vapor, or dust close to the source, before they drift into the breathing zone or spread across the room. When the task is done, the arm swings back against the wall, clearing the bench top for other use.
Because the mount point is fixed to the wall rather than the ceiling, wall-mounted arms fit rooms where overhead duct access is limited, or where benches already sit along an outside wall with a duct chase built in behind it. They are one of the most common retrofit options in existing lab buildings, since the wall penetration is usually easier to add than a new ceiling duct run.
What Makes a Good Wall-Mounted Arm
Wide Swing Range
A 180 degree or greater swing range lets one arm cover more than one bench position without adding a second mount point, and lets the arm park flush against the wall when not in use.
Low Resistance Airflow
Exposed, external joints keep the inside of the duct path clear of internal ridges, reducing resistance in the line so the exhaust fan does not have to work harder than it should to hold capture velocity.
Self-Supporting Positioning
Friction or spring-balanced joints hold the hood at the angle it is set to, so it does not drift away from the work while a task is in progress.
Durable, Easy-Clean Finish
Aluminum and powder-coated steel resist corrosion from lab vapors, and a smooth exterior with a hood free of tight corners is easier to wipe down between uses.
Where Wall-Mounted Arms Get Used
Because they anchor to a fixed wall point, wall-mounted arms fit rooms where the bench layout is fixed along a perimeter and does not change often. Common settings include:
- Perimeter benches and fume hood support stations along an outside wall with existing duct access.
- Chemistry and biology teaching labs where wall benches line the room and island benches use ceiling-mounted arms instead.
- QC and analytical labs running sample prep or solvent transfer at a fixed workstation.
- Retrofits in existing lab buildings where adding a ceiling duct run is not practical, but a wall penetration is.
- Electronics and rework benches mounted along a wall, capturing solder fume directly over the work.
Wall-Mounted vs. Ceiling-Mounted vs. Portable
All three exhaust arm types capture fumes at the source. The right choice depends on where the benches sit and whether ductwork already runs to that wall or ceiling.
| Type | Best For | Reach |
|---|---|---|
| Wall-Mounted | Perimeter benches, rooms with an existing wall duct chase | 3 to 6 feet |
| Ceiling-Mounted | Open labs, island benches, rooms needing overhead duct access instead | 3 to 10 feet |
| Portable | Temporary tasks, rooms with no fixed duct run at all | Self-contained, moves anywhere |
Design and Installation Process
Labs USA reviews the wall construction, bench layout, and available duct access before recommending arm placement and count. Mount points are checked against structural framing or blocking so the arm has a solid anchor, and against nearby fixtures and casework so the swing range stays clear. Installation crews connect each arm to the building’s exhaust ductwork through a wall or ceiling-level penetration and verify capture velocity at the hood face before signing off the room.
Frequently Asked Questions
How are wall-mounted arms installed?
Wall-mounted arms bolt to structural wall framing or blocking. Exhaust connects through a wall penetration to ductwork behind the wall or through ceiling-level connections. Labs USA coordinates structural and ductwork requirements during design.
How much bench area can one wall-mounted arm cover?
A single arm with a 180 degree or greater swing range typically covers one to two adjacent bench positions, depending on reach and how the benches are spaced along the wall.
Can a wall-mounted arm be added to an existing lab building?
Yes, this is one of the most common retrofit options. Labs USA checks the wall construction for a solid anchor point and confirms a practical path for the wall penetration before recommending placement.
What is the difference between a wall-mounted and a ceiling-mounted snorkel?
A wall-mounted arm reaches out from a perimeter wall and fits rooms where bench positions sit along an outside wall. A ceiling-mounted arm drops down from overhead ductwork and works well over island benches or open floor plans. Choose based on where the ductwork runs and where the benches sit.
Do wall-mounted arms work with fume hood support benches?
Yes, they are often installed alongside fixed fume hoods to add point-source capture at an adjacent open bench that does not have its own hood.
How is the correct hood size chosen?
Hood diameter, commonly 4 to 8 inches, is matched to the size and strength of the fume source during design, rather than defaulting to the largest available size.
Related Pages
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