Blauberg Round Circular Inline Ventilation Duct Back Draught Shutter - 100mm 4"

RVK is an inline gravity operated shutter used to dramatically reduce air travelling back into rooms causing draughts and cold air.

Can be used from vertical to 90 degrees. A simple off centered disc is mounted inside a housing and pivots on two small lugs.

This allow are to pass easily in one direction with only a small amount of pressure (resistance). When an extractor fan stops, the disc prevents air from travelling back down the ducting.

The RVK shutter is used mostly on small systems in houses flats and apartment. Simply fit in-line to any ducted bathroom, toilet, shower room, kitchen or utility room 100mm 4" ventilation system.