The H Cowl is probably the ultimate static anti downdraught chimney cowl, as it completely isolates the combustion gases from the prevailing winds.
Manufactured using stainless steel grade 430, and with mesh inserts at the exits, makes this H Cowl suitable for use with appliances fired by oil or gas. Please note that this H Cowl is NOT suitable for use with appliances fired by solid fuel. Please see the solid fuel versions that we have available.
Suitable for use with 150mm internal diameter pipes.
The H cowl has a shaft which is just slightly under the diameter of the cowl, so for example, a 125mm H Cowl will have a shaft with a diameter of around 120mm. It then slides inside the chimney or flue system.
Fitting to a prefabricated chimney system
Slide the cowl inside the chimney system. Secure in place with stainless steel self tapping screws and seal with a high temperature silicone or sealant.
Fitting to a masonry chimney stack or pot
Slide inside the chimney or pot and mortar in place.
Decent item Having downdraft issues. This has fixed my problem. Couldn't be happier. Arrived quickly and well packaged in good condition. (05/05/2016) -
H Cowl Excellent it has solved our down draft problem (10/11/2017) S Travers - Fife
Looks the job Unfortunately I am still waiting for the cowl to be installed since my heating engineer needs scaffolding to access roof/chimney. Will rate once installed (07/11/2018) Mike Rogers - TS9 7BH
H Cowl Had a problem with rain running down the steel flue and staining the wall. The H cowl seems to have solved the problem. Looks very big on the ground but ok once on the roof. Good quality and well priced. I got a quote for one to be made_ more than 3 times the cost! (07/12/2018) Barry - Devon
Guaranteed Solution at a Price The H cowl is going to prevent any downdraught, no question, as the combustion gasses and prevailing wind are completely isolated from each other. The downsides are that it's physically large and, ioho, ugly. There is no fixing method as such, it needs to be cemented in place. Does the job though. (07/05/2011) fluesystems.com - High Wycombe
just the job (07/04/2018) -