The AW/AR fans have integral thermal contacts, are reliable, maintenance-free, and have a controllable speed. The AW/AR fans have external rotor motors with controllable speeds. The AW fans have square plates to facilitate wall mounting and the AR fans have round flanges to facilitate duct mounting.
The casings are made from galvanized steel which are painted in a standard black color. Aerofoil blade impellers are included in the fans which are made from die-cast aluminum and painted in standard black.
The fans have incorporated thermal contacts to protect the motors against overheating.