Circular end has a male connection to fit directly into circular spiral ducting (secure using recommended fixing methods). Stainless steel cowls offer greater weatherproofing, and are not affected by ultra violet rays like some plastics can be. Basically when you are venting an extractor fan through a roof a cowl for venting should be used as it will stop water ingress. Our metal cowls also have a wildlife mesh to prevent animal ingress. The top hat on the cowl is specifically designed to stop rainfall entering to duct system. Do I need to use a flashing when expelling air through a roof? This also features a gravity flap to prevent small mammals and birds from accessing the ducting attached to it.

The gravity flap is stylishly covered by the square shape cowl and in doing so, offers more of an aesthetic appearance than most traditional plastic grilles.