Fitted in-line with 100mm round ducting, this one way non-return flap opens when your extractor fan is operating, thus preventing problems with cold air from outside blowing into your bathroom when the fan is turned off.
Compatible with 100mm / 4 inch flexible round ducting.
Manufactured from polycarbonate.
You can save money on this item when you purchase several at a time. The table below shows the minimum quantities required to benefit from this offer, and how much they'll cost.
||Price per unit