Weatherproof Cowl for external walls, Stops drafts blowing back into the building.
Available in a kit form HERE
Internal flap to stop backdrafts
Can also be used with a backdraft damper for maximu...
Weatherproof Cowl for external walls, Stops drafts blowing back into the building.
Comes complete with Padded flaps and a rubber seal to stop unwanted noise and water getting into your house, If yo...