4" Storm Collar used to stop the ingress of rain into the flue system.
Made from 316 Stainless 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..")