H Cowls are manufactured from stainless steel and are designed as anti-down draught devices. In normal or still air conditions, the hot gases and smoke pass up the chimney and exit out of the top of both of the vertical tubes. If wind drives downwards in turbulent conditions, the air moving down the tubes induces suction as it passes the ...

An H-style cap (cowl) is a chimney top constructed from chimney pipes shaped like the letter H. It is an age-old method to regulate draft in situations where prevailing winds or turbulence cause downdraft and back-puffing. Although the H-cap has a distinctive advantage over most other downdraft caps, it fell out of favor because of its bulky ...

The H Cowl is made from a durable corrosion proof stainless steel and is designed to fit the majority of conventional chimney pots. The H Cowl will prevent rain ingress and promote positive updraught. It has no moving parts once fitted and will be silent in whatever weather conditions. The H Cowl is designed to fit over all standard chimney ...

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 …

An H Cowl can be fitted to a round flue or pot with internal diameters between 100mm to 304mm. The H Cowl is made from stainless steel – recommended for solid fuels including coal, wood and oil. In order to comply with regulations H Cowls for gas come factory fitted with mesh birdguard inserts. An adapter for a square chimney pot is available.

Our cowl designs have been both scientifically tested and subjected to rigorous site testing in difficult, exposed, wet and windy locations over many years. Chimney H Cowls. H Cowls Features. Scientific design produces a consistent draught in the flue, whatever the wind direction.

The H chimney cowl will also protect the chimney from extreme driving rain situations and is probably the best cowl in the SHL range to stop moisture ingress caused by rainwater. Only available in a stainless-steel finish to fit a standard 200/230mm or 8″/ 9“ chimney pot. Suited to both long and short chimneys.

This standard H-Pot is designed to fit over our cover cowl to replace a standard top cowl to help with downdraught issues. Additional information. Size: 100, 115, 125, 150, 200, 225, 250, 300. Related products. Gas Top Cowl $ 82.50 – $ 185.00 Select options This product has multiple variants. The options may be chosen on the product page

The H Cowl is a static cowl that solves both downdraughting and updraughting problems. Ideal for situations where the chimney is too short (conservatories etc) or where the chimney doesn’t clear the ridgeline of the house. Only available in a stainless steel finish to fit a standard 200mm (8″) chimney pot. Dimensions Overall width – 750mm

The H Cowl suitable for twin wall flue systems is the ultimate static anti downdraught chimney cowl. The H Cowl isolates combustion gases from the prevailing winds enabling them to leave the flue without downdraught. Features. 10 Year Warranty ; Supplied with a FREE locking band; Quick and easy to install (designed with the installer in mind)