Three Wall Mounted Extraction Arms Supplied to a Mechanical Contractor | San Jose, California

The Solution

Labs USA supplied three identical assemblies rather than three arms. Each station received a four inch diameter, eighty four inch articulated extraction arm with a manual damper, a wall bracket with a five inch top exhaust outlet, and a fourteen inch dome hood with a connector. Every interface in that chain is a matched component, so the contractor’s only field connection was the five inch duct into the bracket.

Eighty four inches of reach is what makes an arm usable on a deep bench. The arm has to cover the full working depth, swing along the bench to the station either side of it, and still fold back clear of the wall when the bench is being cleaned down. The external support arm geometry is what holds that position: the hood stays where the operator parks it, at any extension, without drifting down under its own weight. An arm that will not hold position is an arm that stops being repositioned.

The fourteen inch dome hood was specified for general bench capture. A dome shape gives a broad capture zone for open work at the bench top, which suits a room where the exact tasks at each station will vary over the building’s life rather than being fixed to one vessel. Where a station has a single known source, a smaller hood at higher face velocity is the better answer, and where a room handles mineral acids, the arm’s air path should be polypropylene rather than standard construction.

Each arm has its own manual damper. With three arms on a shared duct, per-arm dampers are what let the system be balanced in the field and rebalanced later: an idle station can be closed so the two in use get their design airflow, instead of the contractor chasing balance from the fan end.

Wall brackets with a five inch top exhaust outlet matched the contractor’s high level duct route, so each arm rises directly into the branch above it with no offsets or transitions. Delivery was two to three weeks after receipt of order, which fits the sequence a mechanical contractor works to, where extraction arms go in after duct and before final finishes. The installed result is a row of matched wall mounted extraction arms that read as part of the building rather than as three separate purchases.

Advantage

The value in supplying a contractor is not the arm, it is the completeness of the package. An extraction arm has four interfaces: hood to arm, arm to bracket, bracket to duct, and damper to operator. When those come from one source in one configuration, the contractor installs three identical assemblies and moves on. When they do not, each station becomes a small engineering problem solved with whatever is on the truck.

Consistency also matters after handover. Three identical arms mean one spare parts list, one maintenance procedure, and predictable airflow at each station. Mixed assemblies mean the room performs differently bench by bench, and nobody can say why.

It is worth being clear about what these arms are not. They are point source capture for work at the bench top. They do not contain a process, so heated digestions, aggressive reactions, and unattended work belong in a laboratory fume hood. Where benches sit away from walls, ceiling mounted arms are the right variant, and where capture has to follow a job around the room, a portable extractor is.

Labs USA supplies all of those configurations, along with lab casework and lab furniture, and we quote to contractors on their drawings and their schedule.

Return on Investment

For a contractor, the first return is labor certainty. Three matched assemblies with correct connectors install in a predictable number of hours. Field adapting mismatched components is unbudgeted time at the worst point in the schedule, and it is the kind of work that gets noticed at closeout because it is at eye level.

The second is avoided rework. When hood, arm, and bracket are matched, the installed airflow is what the product data says. When they are adapted, the balancing report is the first place the discrepancy appears, and by then the duct is closed.

The third accrues to the building owner. Source capture at the bench exhausts a modest volume per station, and with a damper at each arm, idle stations exhaust nothing. In the Bay Area, where mechanical ventilation runs year round and conditioned air is expensive, a system that only moves air where work is happening has a lower operating cost than any fixed flow alternative.

The fourth is service life. Arms, hoods, joints, and dampers are individually replaceable components. A damaged hood costs a hood. Over a ten year horizon that is a far lower cost of ownership than assemblies that have to be replaced whole because the parts were never a matched set.

Serving San Jose and the South Bay

San Jose and the South Bay run on laboratory and clean production space: semiconductor and materials work, medical device manufacturing, battery and energy research, and analytical laboratories attached to all of them. Most of that space is built or rebuilt by mechanical contractors on tenant improvement schedules, inside buildings that are already occupied.

That makes lead time and completeness more important than catalog breadth. A contractor working in Santa Clara, Sunnyvale, Milpitas, Fremont, or San Jose itself needs the extraction package to arrive as one matched set in the window between duct rough-in and ceiling closure. California seismic practice also means wall mounted equipment and its bracket attachment are a design consideration rather than an installer’s choice.

Labs USA quotes exhaust snorkels in wall mounted, ceiling mounted, and portable configurations directly to mechanical contractors across the South Bay and the wider Bay Area, along with fume hoods, casework, and laboratory tables when the scope extends past ventilation.