Poppins Chimney Sweep - Chimney Cowl
Poppins Chimneys Cowls, Caps and Bird Guards

There are numerous reasons for fitting Cowls, Caps or a Bird Guards to the chimney pot, and a large variety of products available. Poppins Chimneys are happy to advise you on your need for Cowls, a Caps or a Bird Guards and the correct type required. If you have just moved into a new property that has a Cowl fitted, or if you wish to change the use of the fire place, Poppins Chimneys of Bedfordshire can advise the suitability of the cowl for your purpose. Our advice is usually free within the local area.

Disused chimneys can cause problems over time and capping them should due seriously considered. This prevents rain entering the chimney void, mitigating deterioration of the interior of the chimney and stopping draughts. However, it is also important to consider what ventilation you require in the room below.  We can fit a simple cap with a mesh venting space; this has several advantages – it serves the purpose of keeping out damp and draughts at the same time allowing the chimney to breath, preventing damp being trapped in the unused chimney. It also has the benefit of being easily removable, should you, or subsequent owners, wish to change the use back to a fire place.

Types of Cowls, Caps and Bird Guards

Most Cowls are designed to keep out the rain with some kind of hood. In addition, there may be a mesh to keep out birds. There are different cowls for different fuel types; smokeless fuels require a stainless steel cowl, while coal and wood require a Cowl with a wider mesh to prevent blockages. There are also Cowls designed specifically to prevent or reduce down drafts, where this is a problem. Poppins Chimneys are happy to supply and fit the right product for you – and our advice costs you nothing.  See below for a very small selection of the available Cowls and their uses.

Birdguards and Caps

Poppins Chimneys of Bedfordshire High Top Bird Guards/Cowls

Designed to prevent once and for all the ingress of birds, small mammals and leaves into used or unused chimney flues.  For use with appliances fired by oil or solid fuel.

  • Also suitable for disused chimneys
  • Fits chimney pots with outside diameters from 230mm-290mm
  • Adaptor plates available for use with smaller diameter pots
  • Brown painted finish
  • Strap fixing
  • 25mm paint finished steel mesh


Rotorvent or Aspirator Chimney Cowls

Rotorvent or Aspirator Chimney Cowl

Rotorvent or Aspirator is chimney Cowls are made of stainless steel and driven by the wind. The Rotorvent or Aspirator Cowls fit chimney pots with a 150-225mm (6-9 inch). These Cowls are good at limiting downdrafts and can help to increase the draw on a sluggish chimney when it is windy. In some situations Rotorvent or Aspirator Cowls are the only answer to poor chimneys. These Rotorvents or Aspirator Cowls are not generally suitable for an inefficient stove or a fireplace as the Cowls are likely to become tarred up.  To optimise these Cowls use on efficient stoves that will not be run slowly or overnight. The Rotorvent or Aspirator Cowls should be checked and cleaned every year to make sure it is free from tar and check that it can spin freely. We recommend that you avoid the use of aspirators on oil fired stoves, the reason is that in high wind conditions they can create excessive draft and damage the stove as a result.


Bird Guard Chimney Cowl

Ornate birdguards made from steel. Hardwearing M10 steel. Painted finish. An ornate painted chimey birdguard is a simple and cost effective way to keep birds and debris out of your chimney. This bird guard is made from M10 steel and adjusts to fit flues from 150-225mm internal diamater.

Suspending Cowls

Suspending Cowls

Used as a one piece system to secure the liner at the top of the stack, this product is mainly used where a clay pot is being used as there is no need to remove the pot.  We carefully slide the Cowls over the liner and secure it  and then do the same thing when securing the Suspending Cowls to the clay pot.

Chimney Caps or Top  Lids

Chimney  Cap

Cowls used to close off unused Chimneys are called Chimney Caps, Top Lids or Closing Cowls.  These Cowls are used to ‘cap-off’ unused chimneys to save heat loss and stop bird, insect and rain ingress. Manufactured in durable steel with a terracotta painted finish these Cowls allow the all important ventilation within the stack.  They generally fit flue sizes 125-250mm.

A note on fitting Cowls

Poppins Chimneys are skilled and trained engineers who know what they are doing; they don’t just fit the highest quality Cowls but do so using established safe systems of work with their ladders and equipment. There are many Cowl fitters out there who install Cowls more cheaply.  In  order for them to do so, can mean cutting corners with the quality of the Cowls being supplied and with the installation tools.  ENsure your fitter is INsured fully – many are not!…Poppins Chimneys are, of course, full covered for sweeping Chimneys and fitting Cowls!


Using an engineer who is not insured means that YOU pay for any damage that they may cause.