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 high quality stainless steel grade 316 makes this H Cowl suitable for use with appliances fired by oil or solid fuel. Please note that this H Cowl is NOT suitable for use with appliances fired by gas. Please see the gas 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.
Good product With a reducer and some tapping screws it will always fit at any diameter. I'm very satisfied with the working of the H Cowl (04/03/2013) Henk eggink - Netherlands
Excellent service and product quality I have a house on a very windy spot in spain. I tried all shapes and sizes of cowls. The H-shape did the trick. (11/11/2013) Andy - Spain
Great product Great product, perfect replacement for corroded old flue. Thank-you very much! (01/02/2014) -
Great pice of kit The H cowl sorted our down draft problem a treat Fast delivery from this company (01/02/2014) G Mackie - Orkney
150mm H Cowl = Spot On The help / sales line was most helpful in advising what I needed. The size of the unit was a surprise but this is well outweighed by its performance as even in the strongest gale I get no down draft what so ever, no more smoky evenings since installation. Also fits like a glove into our duplex flue (08/02/2016) John Ansell - N;hants
Brilliant!!!!! Cured the problem straight away. First class service, Thank You. (10/02/2017) Allan - Isle of Man
Excellent product and fast delivery So far so good. Have not had any down draft issues since the H cowel was fitted. (10/10/2018) S. Deeney - Monaghan: Ireland.
All Good. All Good Thanks (12/08/2019) Rob - Shropshire
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
H Cowl improved but not entirely resolved blowback Very happy with the quality of the H Cowl...... However ...It has improved the problem of blowback, down a new, external, stainless steel chimney, but unfortunately, has not solved the problem entirely. When the wind is blowing from one particular direction... I am still unable to light the stove (31/05/2014) Lynne - Caithness