DUCTWORK
Commercial ductwork contractor for tenant improvements
AIR DISTRIBUTION
Ductwork that fits the ceiling and delivers the air
Good ductwork is invisible. Every room is comfortable, the system is quiet and nobody thinks about it. Poor ductwork shows up as hot and cold rooms, noisy diffusers and a ceiling that has to be lowered because the duct was not coordinated.
On a tenant improvement the ductwork has to work with what is already there — main trunks that may be reused, structural members that cannot be moved and a ceiling height the architect is not willing to give up. That makes coordination with sprinklers, lighting and plumbing the most important part of the job.
We lay out duct to the reflected ceiling plan, confirm clearances with the other trades before fabrication, and install it with the sealing, insulation and support the code and specification require.
What we coordinate before fabrication
- Reflected ceiling plan and ceiling height
- Sprinkler mains and branch lines
- Light fixture and cable tray locations
- Plumbing waste and vent routing
- Structural members and existing duct mains
- Fire and smoke damper locations at rated walls
SCOPE OF WORK
What we fabricate and install
Supply and return
Rectangular, round and spiral duct from the equipment to every diffuser and return grille, sized to the airflow each room needs.
VAV and zone boxes
Variable air volume and zone boxes installed and connected so each zone can be controlled on its own.
Exhaust systems
Restroom, janitor, copy room and specialty exhaust ducted to the outside with the right fans and backdraft protection.
Grease duct
Welded grease duct for kitchen hoods, installed with the clearances and access the code requires.
Fire and smoke dampers
Dampers at rated walls and floors, installed and accessible for the inspection and testing they require.
Sealing and insulation
Duct sealed to the leakage standard specified and insulated where the energy code requires it.
HOW THE JOB RUNS
How ductwork goes in
01
Coordinate the ceiling
02
Fabricate
03
Install and seal
04
Connect and balance
COMMON QUESTIONS
Ductwork questions
Often, if they are sized for the new airflow and in good condition. Reusing mains saves cost and ceiling disruption. We inspect them before pricing.
Because duct is the largest item above the ceiling. If it is not coordinated with sprinklers, lighting and plumbing, something has to be moved in the field, which costs time and sometimes ceiling height.
They close automatically to stop fire or smoke passing through a duct where it crosses a rated wall or floor. The code requires them at those locations, and they must be accessible for inspection.
Yes. Grease duct is welded, installed with required clearances and access, and inspected before it is enclosed.
Usually because of high air velocity or a poorly placed damper. Correct sizing and balancing avoid it.