IRF is a range of insulated in-line centrifugal duct fans.
They provide high pressure with low sound level.
The IRF fans have good sound insulation qualities provided by a 50 mm of mineral wool. The high quality ball bearing mounted external rotor motors are maintenance free. They can be speed controlled from 0-100% by voltage variation. All motors are protected by approved thermo contacts.
The fans have a strong galvanized steel housing with an IP54 rating incorporating a swing out design of the fan motor and impeller for easy cleaning and inspection.