H Cowl Chimney Terminal

h-cowl-chimney-terminal-1-jpg

Select

In stock

H Cowl Anti Down Draught Chimney Terminal

If you are having down draught issues with your chimney this H Cowl designed by I Q design might be the solution.

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.

The H Cowl is made from a durable corrosion proof stainless steel with a terracotta finish Anti-Down-draught-chimney-terminaland 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

How the H Cowl Chimney Terminal Works

In normal or still air weather conditions the hot gases and smoke pass up the chimney and exit out of the top of both o of the vertical tubes.

If wind drives downwards in turbulent weather conditions the air moving down the tubes induces suction as it passes the horizontal tube and the hot gases and smoke exit out of the bottom of the vertical tubes.

H Cowl Dimensions

Height (standing pre install) 500mm

Width 750mm

Depth it goes into Chimney Pot 230mm

Height (post install) 270mm

Chimney H Cowl Colours

Up to the 2015 winter season the H Cowl was only available in a terracotta colour finish but it is now available in four different colours.

terracotta-h-cowl-chimney-terminal
Terracotta Finish

h-cowl-chimney-cowl-stainless-steel
Stainless Steel Finish

H-Cowl-Chimney-Terminal-Stainless-Steel
Cream Finish

H-Cowl-Chimney-Terminal-Black
Black Finish

 

What is the Difference Between the H Cowl and the OH Cowl?

H-Cowl

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. (See diagram below on left)

how-h-cowl-works

If wind drives downwards in turbulent conditions the air moving down the tubes induces suction as it passes the horizontal tube and the hot gases and the smoke exits out of the bottom of the vertical tubes. (See diagram above on right)

OH Cowl (Available to order here!)

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. (see diagram below on left)

how-oh-cowl-works

If wind drives downwards in turbulent conditions, the air moving down the tubes increase in velocity because it is restricted as it is forced through a narrow gap as it passes over and around each end of the horizontal tubular section projecting half way into the vertical tubes.

The increase in velocity (basically a venturi effect) induces suction as it passes the horizontal tube and the hot gases and smoke exit out of the vertical tubes. Any upward gusts of air will also act in a similar manner so this design of OH cowl becomes very effective in windy conditions where the chimney is subject to downdraught. (see diagram above on right)

 

 

winner_h

chimney-cowl-jpg

Chimney Cowl

Click Image or Product Title (Above) for Price Options

smart-oh-cowl-stainless-steel-copy-png

Chimney OH Cowl

Click Image or Product Title (Above) for Price Options

24 Comments

  1. Our chimney has a 10.5″ outer diameter. We get serious down draught! Would you have a h cowl that May solve our problem and what price please?

  2. Hi… I don’t know whether I need a H Cowl, OH Cowl or the spinning cowl… have terrible downdraught in windy conditions… cannot light the stove in this case… Chimney is stainless steel one off the stove- built to spec- right height etc, house is a bungalow… need to get this sorted as it is a waste.

    1. If doesn`t have huge downdraught problems, Storm Cowl will be perfect in this situation. Is round and will assist on wind redirection.

      If there are downdraught problems as well, H Cowl would be the best, but is a massive cowl and don`t know how will face to a strong wind. Still think that Storm Cowl could be the best solution.

  3. we have a stove & have had a spinning. Cowl which helped with lighting the fire with the updraught however its passed its best & we want to replace it with something similar but not a spinner as it keeps us awake at night. Any options?

  4. I’ve a stove which has very little draw on calm days , we replaced our chimney flues recently with ceramic flues due to fire damage and my builder said that he installed a spinning cowl to address the draw issue. However , on calm days or until the fire is well lit opening the door will emit a lot of fumes from the stove . Is there any other cowl to help with this issue?

    1. I would hope that a H Cowl might address the problems you are having but I can’t 100% guarantee it would. We are selling them for over 3 years now and the only time we ever had a return was when the customer didn’t have a standard 8 Inch Chimney Pot. Even in that case we were able to get the manufacturer to make a custom size for the customer. It is also possible that there may be a structural issue with the installation of the new flues

  5. I have newly installed wood pellet stove it’s burn normally on calm weather but alarm goes off on windy days saying there blockage . I think the problem is downdraught problem. Which cowl would solve this

    1. Every chimney is different but in general yes it will work. However if the chimney pot is lower than the nearby buildings or trees, won`t matter what type of cowl is used as you still won`t create enough up draught. In this situation only a chimney extender might solve the problem.

Leave a Reply

Your email address will not be published. Required fields are marked *