VAV boxes are the last thing your air passes through before it reaches people, and they hide above the ceiling where nobody looks. We clean the damper, reheat coil, sensors and liner so every zone controls and breathes the way it should.
A VAV (variable air volume) box is the terminal unit that meters conditioned air into a single zone. Inside a small sheet-metal box above the ceiling sits a damper and actuator, an airflow sensor, usually a reheat coil, and an acoustic liner. It is the last device the air touches before it reaches the people in that zone — which makes its condition a direct comfort and air-quality issue.
Because they are out of sight, VAV boxes are the most neglected part of most commercial systems. Dust binds the damper and skews the flow sensor, so the zone stops holding setpoint. The reheat coil fouls and loses winter capacity. Worst of all, the internal liner collects moisture and debris and becomes a microbial source sitting directly over the occupants.
IAQ Restoration cleans commercial VAV terminals in place, above the ceiling, under occupied-space containment — restoring damper movement, sensor accuracy, reheat capacity and liner condition, verified to the NADCA ACR Standard.
Hidden above the ceiling, a VAV box is easy to forget — until the zone it serves runs hot and cold, the reheat stops working, or the liner over the occupants turns into a microbial source.
Every part of the VAV box that moves air, senses it, conditions it or contains it — cleaned and verified.
The damper and its actuator are cleaned so the box modulates airflow smoothly and holds the zone at setpoint.
Hot-water and electric reheat coils are cleaned so winter capacity and zone temperature control come back.
Dust on the flow sensor skews the reading and the box loses control. We clean the sensor and inlet so the signal is true.
The acoustic liner is inspected and HEPA-cleaned; moisture-damaged liner directly over occupants is flagged for repair.
On fan-powered VAV boxes, the fan and motor compartment are cleaned to restore induced airflow and cut noise.
The sound attenuator and discharge are cleaned so the box delivers clean, quiet air into the zone.
Single-duct, fan-powered, reheat or pressure-critical — we clean them all to one documented standard.
A documented, above-the-ceiling process that protects the occupied space below and follows the NADCA ACR Standard.
We map the terminals from the controls list and open safe above-ceiling access without disrupting the space below.
The box is isolated and the occupied area beneath is protected with containment and floor protection.
Cleaning is done under HEPA-filtered collection so nothing falls into the space or the ductwork.
The damper, actuator, reheat coil, sensor and liner are cleaned; treatment is applied where growth is found.
We confirm the damper modulates, the sensor reads true and the box responds — control restored, not just clean.
The ceiling is closed back, the area handed back, and the terminal is logged in a photo-documented closeout.
A clean damper and true sensor let each box control its zone again — ending the hot-and-cold complaints that fill the help-desk queue.
The liner and coil sit directly over occupants. Cleaning them removes a microbial source the airstream would otherwise deliver into the room.
A clean reheat coil delivers its designed capacity, so the system is not overcooling and reheating to fight a fouled terminal.
Zone complaints are usually a terminal problem before they are a system problem.
Clean terminals still need clean upstream equipment. Explore the connected components — or the commercial air duct cleaning pillar.
VAV terminals are inspection-based like the rest of the system, but because they sit above occupied ceilings and are rarely serviced, they are often overdue. We assess them with the central equipment and clean when the damper, sensor, coil or liner show fouling or when zones lose control — typically on a two-to-three-year cycle, sooner in healthcare or after ceiling work.
Yes. We work above the ceiling under HEPA-filtered containment with floor and workspace protection, on nights, weekends or phased zones with daily hand-back, so the occupied space is protected and back in service each morning.
Yes. A full terminal cleaning includes the damper and actuator, the airflow sensor, the reheat coil and the internal liner, and we verify the box modulates and reads correctly — so you get restored control, not just clean surfaces.
Yes. We clean hundreds of terminals across towers and multi-site portfolios to one standard and one report format, with NADCA-certified crews nationwide. Call 800-883-6040.
NADCA-certified VAV terminal cleaning, verified to the ACR Standard and documented box by box. Book a terminal assessment — we’ll scope it free.
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