Mechanical Supplies

Cassette fans

About

Low-profile ceiling cassette extract fans with an integral grille face, backdraught shutter and a spigot for flexible or rigid duct connection, built on small forward-curved direct drive wheels, the class Twin City covers with Model DDF at 6" to 10.5" wheel diameters, airflow to 2,100 CFM and static pressure to 1.75" w.g. Depth is held to what a standard ceiling void will accept.

Application

Fitted in bathrooms, small toilets, pantries and single offices in residential, hotel and commercial fit-outs. They combine the extract point and the fan in one accessory, which suits refurbishments where running a duct back to a central riser would mean opening the whole ceiling, but the low static capability means the duct run behind them has to be short and genuinely as drawn.

Standards & Reference 6 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.
ISO 5801
The international method for testing industrial fan performance using standardised airways. It is the ISO counterpart to AMCA 210.
ErP 1253/2014
The EU ecodesign regulation for ventilation units, setting minimum efficiency for equipment placed on the European market.
IEC 60335-2-80
Safety requirements specific to fans, within the general standard for household and similar electrical appliances.
EN 13141-4
Performance testing of fans used in residential ventilation systems.