H Shaped Chimney Cowl

Chimney cowls are hoods that fit over the top of a chimney stack.

H shaped chimney cowl.

With the globe type the wind catches the fins and the globe rotates. A h style cap cowl is a chimney top constructed from chimney pipes shaped like the letter h. Stainless steel rotating chimney cowl. Although the h cap has a distinctive advantage over most other downdraft caps it fell out of favor because of its bulky looks.

This rotating action prevents the wind from blowing down the chimney stack. An adapter for a square chimney pot is available. Before buying this type of chimney cowl make sure the cowl is designed to handle the fuel you re burning such as wood natural gas or fuel oil and make sure the base fits your chimney. Fit easily within minutes no tools are required to assist the fitting process you simply use adjustable toggle clamps to secure the h cowl to the chimney pot.

Revolving chimney cowls revolving chimney cowls are designed to eradicate downdraught in chimneys flues and ducts. Normally caused by low chimney stacks and obstructions that can be around the chimney pot and is mostly noticeable when winds are blowing in a certain direction. How the h cowl chimney. There are two types.

Fitting to a prefabricated chimney system slide the cowl inside the chimney system. This cowl is strap fitted and hand made from 316 stainless steel and is suitable for all fuels. 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.

The h cowl is made from a durable corrosion proof stainless steel with a terracotta finish and is designed to fit the majority of conventional chimney pots. This causes the wind to flow around the cowl which actually causes an increase in chimney draft. It is an age old method to regulate draft in situations where prevailing winds or turbulence cause downdraft and backpuffing. An h cowl can be fitted to a round flue or pot with internal diameters between 100mm to 304mm.

The o h cowl is the recommend cowl for blow backs in a fire place. The most popular type of chimney cowl is the h style or h pot and it has a definite advantage over other caps because it stabilizes the draft so your fireplace works more efficiently. They are designed to increase the upwards movement of air in the flue ensuring that any smoke or other harmful gasses produced by a fire are quickly removed from your home. 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.

The h cowl will prevent rain ingress and promote positive updraught. These are constructed from h shaped pipes and work by separating the combustion gases from the turbulence and winds that bring down the drafts.