Mechanical Supplies

Ducted inline fans

About

Inline centrifugal duct fans that deliver centrifugal pressure capability in a straight-through duct casing. Twin City's Model BCS backward-curved high-pressure range covers 16.5" to 89" wheel diameters, airflow to 291,400 CFM and static pressure to 40" w.g., and is licensed to bear the AMCA Seal for both air and sound performance.

Application

Used for toilet, kitchen and general extract, for supply boosting on long duct runs, and in fit-outs where there is no room for a fan cabinet. Because the fan sits in the ceiling void over occupied space, breakout noise through the casing usually decides the selection rather than the duty point, which is why an AMCA-certified sound rating matters more here than in a plant room.

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 211
The certified aerodynamic ratings programme: the equivalent independent verification for a published fan performance curve.
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 311
The certified sound ratings programme: independent verification that a published sound rating is what the fan actually produces.
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.
UL 705
Power ventilators: the safety listing for powered fans in North American specifications.