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Extraction vents Inlet vents with adjustable flow
BIR

BIR - Defaut

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Description Packg. * Code
BIR 100 + drywall adapter, L = 100 mm 36 1180
BIR 125 + drywall adapter, L = 100 mm 27 1181
BIR 160 + drywall adapter, L = 100 mm 18 1182
BIR 200 + drywall adapter, L = 100 mm 9 1183
* packaged quantities are shown for information purposes – All items can be ordered singly
BIR 100 + drywall adapter, L = 100 mm





Made entirely from sheet steel with a white epoxy paint coating, BIR vents comprise an intake cone, an adjustable centre disc, a thumbwheel for adjusting the flow, and a lip seal to hold the unit in place and keep it airtight.

These vents incorporate a rubber seal that allows them to be fitted directly onto a flexible or rigid duct or onto a 3-claw drywall adapter, length 100 or 150 mm.

The graphs below show the flow-pressure curves for BIR vents. The figures at the top indicate the setting position R in mm.

The airlow is adjusted by screwing the thumbwheel  in or out, which moves the centre disc  in or out.