Mechanical Supplies

Rooftop fans

About

Roof-mounted centrifugal and axial fans with upblast or downblast discharge, on a matching curb with a backdraught damper and a hinged base for service. Upblast versions throw the discharge clear of the roof surface and are the required arrangement for grease-laden exhaust, where UL 762 listing applies
the TCVA vaneaxial also makes an upblast roof unit.

Application

Used for toilet, kitchen and general building exhaust discharged at roof level, keeping the fan out of the plant room and the noise off the occupied floors. Discharge position matters as much as the fan itself: an exhaust outlet placed upwind of a fresh air intake re-entrains its own contaminated air, a design fault that no filter downstream can correct and that only shows up once the building is occupied.

Standards & Reference 7 cited

AMCA 210
The laboratory method for testing fan aerodynamic performance: airflow, pressure, power and efficiency. A fan curve that is not tested to this is not comparable with one that is.
AMCA 300
The reverberant room method for measuring the sound a fan emits. The source of the sound power figures used in an acoustic calculation.
AMCA 99
The standards handbook: the definitions, classifications and construction classes the rest of the AMCA standards refer back to.
ISO 5801
The international method for testing industrial fan performance using standardised airways. It is the ISO counterpart to AMCA 210.
NFPA 96
Ventilation and fire protection for commercial cooking operations: the standard behind kitchen extract design.
UL 762
Power roof ventilators for restaurant exhaust: the listing required of a kitchen extract fan handling grease-laden air.
UL 705
Power ventilators: the safety listing for powered fans in North American specifications.