4" Ventilated Firestop Spacer to fit on the underside of the ceiling where flue passes through to an enclosed space in the room above. Allows for air circulation.
Made of Heavy Duty Galvanised Steel
(Please note: We base all of our twin wall system on the internal diameter measurement).
Same day dispatch if ordered before 2pm.
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Our twin wall insulated is a simple push-fit joint system. Build your system by placing each piece on top of the previous and push together to make the join. This is the simplest system to construct on the market today.
Download Building Regulations Document J (effective October 2010) below
(Right click link, then select "save file as..")