The H Cowl is probably the ultimate static anti downdraught chimney cowl, as it completely isolates the combustion gasses from the prevailing winds. Manufactured using stainless steel grade 430.
These H Cowls have mesh inserts, and are suitable for use with appliances fired by oil or gas.
Suitable for use with 200mm 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.
