Mechanical Supplies

Chemical-resistant fans

About

Fume extract fans in polypropylene, PVC and FRP, or steel with a chemical-resistant coating, with sealed shafts and spark-resistant construction to AMCA Standard 99-0401 where an ignition risk exists. Material selection follows the specific chemical, its concentration and temperature, there is no universally resistant plastic, and a wrong selection fails by embrittlement rather than by wear.

Application

Serve laboratory fume cupboards, battery and plating rooms, water treatment and chemical dosing plant, and pharmaceutical and food process exhaust. In laboratories the fan runs continuously and discharges above roof level at a velocity high enough to clear the building's recirculation zone, so both the material and the discharge arrangement form part of the safety case, not just the fan curve.

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 99-0401
The fan construction classes within the AMCA handbook, setting what a fan can be run at structurally.
ISO 5801
The international method for testing industrial fan performance using standardised airways. It is the ISO counterpart to AMCA 210.
ATEX 2014/34/EU
The European directive for equipment used in potentially explosive atmospheres. It is required where fuel, dust or solvent vapour is present.