Inlet Box Louvre Dampers

Inlet Box Louvre Dampers: Pre-Spin and Opposed Blade

Both types of inlet box dampers differ from the IVC in that the bearings are outside the airstream, allowing higher temperatures and dust laden applications.

Literature

Product Bulletin: ID100

Pre-Spin Dampers

Alter fan performance by moving down the system curve
Double surfaced blades welded to full length axles and operate parallel to each other to pre-spin the air

Opposed Blade Dampers

Blades provide a straight flow of air towards the fan
Typically used in Boiler applications
Located above a mixing box in front of the fan inlet