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was the first gas chimney cowl in the UK to pass the vigorous requirements of BS7 15:1993 (200mm)
8 to 6 m between the roof and ceiling
Available in 90°
Please follow these steps to find the best solution for your room:
Cylinder - 930ml / 136g
VELUX BBX 0000 Vapour Barrier harry1005 was the first gas chimneyDescription: The VELUX Vapour Barrier BBX stops warm, moist air from your home from entering your roof construction. Its quick and easy to install in your window frame, and creates an airtight seal to protect your roof from condensation and potential damage. The edge of the BBX vapour barrier is specifically designed to fit tightly into the window frame rebate providing an air tight seal which will assist in meeting air pressure testing of the
