Mechanical Supplies

Bifurcated axial fans

About

Bifurcated axial fans in which the motor sits outside the airstream in a split casing, driven by a shaft through the bifurcation. Because the motor never touches the handled air, these fans survive duties that would destroy a conventional axial fan, Twin City's equivalent utility set duties reach 300 °F on the kitchen-rated Model BCVR.

Application

Used for kitchen grease extract, laundry and drying room extract, fume and hot gas handling, and smoke extract at elevated temperature. In commercial kitchens they are the standard selection because grease-laden vapour would otherwise coat and overheat an in-stream motor, the same reason UL 762 listing for grease-laden air is the certification to look for on this duty.

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.
UL 762
Power roof ventilators for restaurant exhaust: the listing required of a kitchen extract fan handling grease-laden air.
EN 12101-3
Powered smoke and heat exhaust ventilators: the fans that must keep running in hot smoke.
NFPA 96
Ventilation and fire protection for commercial cooking operations: the standard behind kitchen extract design.