Swirl Diffuser Plenum Box 400 Acoustic Lining:Yes Speed Flexibility: Motor speed can

Speed Flexibility: Motor speed can be reduced to 20% of maximum via frequency inverter

Durable Build: Features an aluminium backward curved impeller and Penta-post frame for enhanced durability

with the option to convert TH-500

For detailed specifications

Designed for thermal and acoustic insulation

Swirl Diffuser Plenum Box 400 Acoustic Lining:Yes Speed Flexibility: Motor speed canGalvanised steel plenum boxes designed for NK SWA 400 fixed blade swirl diffusers with side entry configuration. Available with optional 12mm acoustic foam lining for enhanced sound control. Pricing varies based on spigot size (refer to the dropdown below). Click the image for detailed dimensions.