 |
|
|
|
|
|
|
|
|
|
|
Technical |
|
|
|
|
|
Design Guides |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Building Management |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Chinmey Cowls
A cowl is a usually hood-shaped covering used to increase the draft of a chimney and prevent back flow. The cowl, usually made of galvanized iron, is fitted to the chimney pot to prevent wind blowing the smoke back down into the room beneath. They have been in use for centuries.
When using an open fire to heat a room the smoke rises via a flue to a chimney pot on the roof. Under normal conditions the warm air from the fire will rise up the chimney taking the smoke with it and dispersing it at rooftop level where it is less of a nuisance.
In strong winds the force of the wind may overwhelm the up draught and push the airflow in reverse down the flue. Smoke will then fill the room it is intended to heat posing a health and fire risk, causing discomfort and dirtying furnishings.
When raw coal, rather than smokeless fuel is burnt, which was the case for centuries before clean air legislation, then the amount of smoke is considerable and measures to prevent back flow occurring are a necessity.
Another secondary function is to keep birds and squirrels from nesting in the chimney. They often also act as a rain guard to keep rain from going down the chimney. A metal wire mesh is sometimes added as a spark arrestor.
The anti downdraft cowl by Brewer for all fuels and systems
The Ultimate Flue Outlet originally introduced in 1995, was the first gas chimney cowl in the UK to pass the rigorous requirements of BS715:1993 (200mm). Its ever increasing market share is testimony to its extensive benefits and advantages over other cowls.
Now the new U.F.O. Mk II does all that the original U.F.O. does, but its new adjustable upstand addresses the greater smoke demand of solid fuels
- What do you get: -
- Fully assembled including factory fitted bird guard.
- Adjusts to fit 150 to 250 mm (6-10") flues and pots.
- Stainless steel high security strap and leg fixing.
- 1.2mm thick quality aluminium alloy, powder coated finish in terracotta colour as standard.
- Tested and certificated (Certificate No. BG/TR/95/96) to BS 715: 1993 (200mm) and BS EN1856-1:2003
- Suitable for all gas appliances to BS 5871, 1991, Parts 1,2 & 3 - including radiant gas fires, coal and log effect gas fires, vertical flued gas boilers etc.
- Performance tested for use on oil appliances by OFTEC.
- Better rain and bird protection than other cowls.
- Larger or square base available on request
- Stainless steel model also available.
- Fitted with upstand legs as standard that allow it to be easily converted for use with solid fuel.
 |
The U.F.O. on the left is being used as a gas cowl, on the right the same cowl refitted in solid fuel mode |
 |
Standard Terracotta Cowl - Strap Fixing
The Standard Cowl is available in Terracotta and Galvanised finishes. The cowl is simple to fit and reduces rain entry. Each cowl is fitted with a mesh grill which also prohibits any animal entering the chimney whilst maintaining flue efficiency.
The Standard Cowl provides good ventilation and gives added protection against wind and rain entry and subsequent structural damage caused by freeze/thaw cycle.
Features: - Ready to fit, no tools required and fits dead or live chimneys
- High Dome allows for effective sweeping
- Suitable for all types of flue
- Fits flues and pot sizes from 125mm (5" to 250mm (10")
- Includes a stainless steel strap.
|
 |
Junior Terracotta Cowl - Bolt Fixing
The Junior Anti-Downdraught Cowl is an ideal solution for curing smokey fireplaces by preventing downdraughts by creating a positive airflow whatever the wind direction.
In addition the cowl also prevents birds, rain and vermin entry.
- Suitable for all types of fuel.
- Tested to BS 715 1993 and BSEN 1856 Part 2.
- Suitable for all gas appliances -
- Coal and log effect Gas Fires, Radiant Gas Fires, and Vertical Flued Gas Boilers.
- Performance tested for use on OIL Appliances.
- Bird guard must be fitted when burning gas or oil.
- Smokeless flues use terracotta cowl.
- Solid flue remove integral bird guard.
|
 |
The Junior Anti-Downdraught Cowl Fits flues and pots sizes from 125mm (5") to 250mm (10").
|
Thinking of home improvments:
Call us on the number below or email us at info@carryduffdesigns.co.uk
We undertake projects within and around the following areas: All of Belfast, Newtownards, Bangor, Ards Peninsula, Comber, Ballynahinch, Downpatrick, Lisburn, Banbridge, Craigavon, Portadown, Newtownabbey and Carrickfergus.
|
|
|
