Four Ceiling Mounted Extraction Arms on Long Drop Brackets: Restoration Contractor, Staten Island, New York
A restoration contractor in Staten Island, New York needed fume and dust capture at four identical work stations in a high bay space with no usable walls. Labs USA supplied four ceiling mounted extraction arms on five foot drop brackets with side exhaust, clear dome capture hoods and finish escutcheon plates, engineered around a fourteen foot structural deck.
The Situation
This project came from a restoration contractor operating out of a facility on Staten Island, New York. Restoration and remediation work involves cleaning, stripping, refinishing and repairing salvaged contents, and that means solvents, adhesives, coatings, resins and fine airborne particulate released at a bench, by hand, in small quantities but continuously through the working day. It is the same exposure problem a laboratory has, created by different work.
The room, however, was nothing like a laboratory. It was a high bay space with an exposed structural deck overhead and strut channel available for hanging services. Bench positions were fixed by workflow rather than by walls, and the stations sat out in the open floor area where the work could be spread out and moved through. There was no run of solid wall behind the benches to hang anything from, and mounting an arm to a partition that happens to be nearby would have put capture in the wrong place.
Four stations had to be treated identically. Uniformity matters more than it sounds on a job like this: when every station has the same reach, the same hood and the same capture behavior, work can be assigned to whichever bench is open instead of routing the smelly jobs to the one bench that has ventilation. Uneven provision is how a facility ends up with a queue at one station and an unused station next to it.
The ceiling was the real design constraint. The available structure sat high above the work, so a standard short ceiling mount would have suspended the arm well out of reach and left the hood hanging in mid air above the operator’s head, where it captures nothing. The gap between the structural deck and the working height had to be closed by the mounting hardware itself, not by asking operators to reach up and pull a hood down from above head height.
Because the mounting height drove the whole assembly, it was confirmed before the order was released rather than discovered on site. The recommendation was for the bracket to land on the hard deck or strut channel at a fixed height above finished floor, with the explicit understanding that if that height could not be achieved in the field, the bracket would be resized and requoted instead of shipped and improvised. On a four station order, that one question is the difference between a system that works on day one and four brackets that have to be sent back.
The Solution
Labs USA supplied four complete ceiling mounted source capture assemblies, each one built from an extraction arm, a long drop bracket with integral side exhaust, a clear capture hood and a finish escutcheon plate. Each station received the same package, so the four benches perform the same way.
The drop bracket is what makes a high structural deck usable. Each station received a sixty inch bracket with a five inch side exhaust connection, which carries the arm down five feet from the mounting point so the arm’s own reach starts at a height a person can actually work at. The side exhaust outlet also keeps the duct takeoff out of the way of the arm’s rotation, so the assembly can swing a full circle without the flexible hose fouling on the duct run. It is a small detail that decides whether an arm gets parked out of the way or used all day.
The arms themselves are four inch diameter, sixty six inch aluminum extractor arms. Four inch diameter is the practical choice when the captured material includes solvent vapor and fine particulate together rather than vapor alone: the larger bore moves more air at the hood face and is less prone to loading up than a small diameter arm used for light chemistry. Aluminum construction keeps the arm light enough that the articulated joints hold position without an operator fighting the arm into place, which is what keeps a hood where it was put.
Each arm was fitted with a fourteen inch clear dome hood and connector. The clear dome was specified deliberately for hand work: the operator can see through the hood to the piece being cleaned or coated, so the hood sits directly over the release point instead of being pushed off to one side for visibility. A hood the operator cannot see past ends up parked somewhere convenient rather than somewhere effective.
Finally, each assembly included an escutcheon plate at the ceiling penetration. That is a finish part, not a performance part, and it is the kind of item that gets dropped from a quote and then noticed for years: it closes the gap where the bracket passes the ceiling line, so the installation looks finished and the penetration is not left open to the space above. Together the four assemblies are a complete ceiling mounted extraction installation rather than a box of arms that still needs parts sourced locally.
Features
Advantage
There are three ways to deal with hand work that releases solvent vapor and dust at an open bench: enclose the work, exhaust the whole room harder, or capture at the source. Enclosures are the wrong tool for large salvaged items and hands-on cleaning, because the item does not fit and the operator needs to reach around it. Raising general room exhaust in a high bay means conditioning and moving an enormous air volume to dilute a small release, and it still pulls that release past the operator’s face on the way out.
Source capture at four stations solves the exposure where it happens, using a fraction of the air. In a high bay, the mount type is the whole design question. Ceiling mounting was correct here because the benches stand in open floor with no wall behind them; where benches run along a solid wall, wall mounted arms are simpler and cheaper to install, and where the release point moves from job to job, a mobile unit is the better answer. Labs USA specifies the full range of exhaust snorkels and extraction arms alongside laboratory fume hoods, so the recommendation follows the room instead of whatever product line is easiest to sell.
The second advantage is standardization. Four identical assemblies mean one spare parts list, one set of replacement hoods and one maintenance routine, instead of four variations that each need their own part numbers three years later.
Benefits
- Vapor and dust are captured at the bench, before they reach the operator’s breathing zone
- Four identical stations, so work can be assigned to whichever bench is free
- High structural deck made usable by bracket length rather than by operator reach
- Full arm rotation at each station without the duct takeoff getting in the way
- Clear hoods let operators keep the capture point over the work they are watching
- One standardized assembly to maintain, with individually replaceable hoods and joints
A fourteen inch clear dome hood gives a wide capture area the operator can see through, so the hood is positioned over the release point rather than pushed aside for visibility. Hoods, connectors and joints are replaced individually as they wear.
Return on Investment
The first return is air volume. Four source capture arms exhaust a targeted, modest amount of air. Attacking the same problem with general exhaust in a high bay building means paying to replace and condition many times that volume, every hour the facility is open. In the New York climate, with humid summers and cold winters, that is a recurring utility cost rather than a one time purchase.
The second is throughput. Because all four stations are equipped identically, none of them is a bottleneck. A single ventilated bench in a four bench shop quietly sets the pace of every job that releases fumes, and the cost of that is paid in labor hours that never appear on an equipment invoice.
The third is avoided rework on the install itself. Bracket length was settled against the actual structural height before the order shipped, with the option to resize left open. Discovering a mounting height problem after delivery means return freight, a restocking charge and a crew standing around, which on a four station order can cost more than the hardware it corrects.
Finally these are serviceable assemblies. Arms, hoods, connectors and joints are individually replaceable, so a damaged hood at one station is a part order rather than the start of a conversation about replacing the system.
Project Process
Understand the Work
Identify what is released at each bench, how often, and whether it is vapor, particulate or both.
Measure the Structure
Confirm the height and type of available overhead structure, including strut channel and hard deck.
Size the Drop
Select bracket length so the arm’s working range lands at bench height, with a resize path if the field differs.
Match the Hood
Specify hood size and style for the task and for the operator’s line of sight.
Supply Complete Assemblies
Deliver arms, brackets, hoods, connectors and escutcheon plates as four matched packages.
Source Capture Ventilation for Staten Island and the New York Metro Area
Staten Island and the wider New York metro area run an unusually dense mix of the work that needs source capture: restoration and remediation shops, conservation and art handling facilities, hospital and university laboratories, environmental and materials testing labs, dental and prosthetics laboratories, and light manufacturing where bonding and coating happen at a bench. Almost all of it sits inside older buildings where the ventilation was never designed for the current use.
That is where mount type matters. High bay ceilings, mixed structure, limited wall space and existing benches that nobody wants to move are the normal conditions, not the exception. Specifying around the structure that is actually there is most of the job, and it is why bracket length, exhaust takeoff position and hood choice get more attention than the arm itself.
Labs USA supplies ceiling mounted extraction arms, wall mounted arms, exhaust snorkels, fume hoods and laboratory casework throughout New York and New Jersey. To size an installation around your ceiling height, call 801-855-8560.
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Frequently Asked Questions
Why use a five foot drop bracket instead of mounting the arm at the ceiling?
Because a high structural deck puts a standard ceiling mount far above the work. The arm’s reach is measured from where it is mounted, so if the mount is fourteen feet up, the hood never comes down to the bench in a usable way. The drop bracket closes that gap with rigid steel duct so the articulated section starts at a workable height.
What does a side exhaust connection do?
It takes the duct off the side of the drop bracket rather than in line with the arm. That keeps the flexible hose and duct run clear of the arm’s rotation, so the arm can swing a full circle around the station without fouling on its own ductwork.
Why a four inch arm rather than a three inch?
Diameter is chosen for what is being captured. A three inch arm is well suited to light chemistry and vapor at a small bench. A four inch arm moves more air at the hood face, which suits work that releases solvent vapor and fine particulate together and is less prone to loading up over time.
Why clear dome hoods?
Visibility. For hand work such as cleaning, stripping or coating, the operator has to see the piece. A clear hood can be placed directly over the release point and still leave the work in view, so it stays where it belongs instead of being pushed aside.
What is an escutcheon plate for?
It is a finish trim plate that closes the gap where the bracket passes through the ceiling line. It does not affect airflow, but it finishes the penetration and keeps the installation looking intentional rather than improvised.
Can stations be added later?
Yes. Each station is an independent assembly of arm, bracket, hood and connector, so a fifth or sixth station is a matching package rather than a redesign, provided the exhaust system has capacity for the additional airflow.
Need capture at a bench with nothing but ceiling above it?
Labs USA sizes ceiling mounted extraction arms around your actual structure: deck height, strut channel, bench positions and what is being released. Tell us the ceiling height and the work, and we will specify the drop.
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