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Simple, effective emissions reduction for all Wood Burning Stoves. The MidCat Puriflue can be fitted to new or old appliances and reduces emissions to be fully eco-compliant.

Please select the diameter of your flue and the length of the Midcat Puriflue (available in 5″ and 6″ diameter and 2 lengths, 250mm  or 500mm)

FREE Delivery on all Midcat Puriflue from Chimney Cowl Products

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From £294.00

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MidCat Puriflue is the most innovative approach to solving the problems of pollution created by wood burning stoves. The MidCat Puriflue can be fitted to new or old appliances and reduces emissions to be fully eco-compliant.

MidCat Puriflue - Solving Woodburning Stove Emissions

With the new Eco 2022 regulations coming into force, the thought of having to upgrade your trusty woodburner is overwhelming. We have the solution! The MidCat can be fitted to your new or existing stove and reduces emissions to be fully eco-compliant.

Using specially developed catalysis-emissions-technology (CET), the new MidCat is an innovative approach to solving the problems of pollution created by woodburning stoves.

What are the benefits of installing a MidCat?

The MidCat is an effective solution for anyone wishing to reduce their environmental impact, whilst enjoying the benefits of a woodburner. It offers:

  • Better than 75% reduction in Carbon Monoxide
  • OGCs typically reduced by 35%
  • 25% reduction in the solids and liquids which create particulate matter
  • Increased heat output from the flue gas due to the exothermic reactions
  • Improves the performance of many older stoves making them compliant with Ecodesign Regulations
  • Enhances newer models to future-proof against further tightening of environmental regulations

How does it work?

Designed for retrofitting to existing stoves, The MidCat is a by-passable catalytic converter system, which reduces the environmentally harmful and toxic emissions generated by woodburning.

Fitted into the chimney, the catalytic converter is designed as a butterfly valve, enabling it to be rotated in or out of the flue gas, allowing for control of the emissions and draught control when needed.

What’s the science behind it?

Using similar technology to that found in car exhaust systems, the MidCat has a free-flowing metallic honeycomb structure – which creates a large surface area that is exposed to the flue gas – coated with a proprietary precious metal catalytic compound, specially developed to cope with the conditions found in woodburning.

As the flue gases come into contact with the coating an exothermic chemical reaction occurs which converts the toxic compounds into less harmful gases such as CO2 and water vapour, this process can be considered as an additional combustion process with the added advantage of releasing extra heat energy.

Why do I need one, isn’t woodburning already eco-friendly?

Despite wood being a renewable energy source – and widely regarded as carbon neutral – there is increasing awareness and concern about the negative impact of the resultant smoke on air quality.

Wood smoke is made up of many harmful substances – gaseous, liquid and solids – all of which are inhaled and are known to cause health problems, as well as damage to the environment.

New legislation which comes into effect from 2022 (The Ecodesign Directive) mandates that stoves burn more cleanly, with large reductions in Carbon Monoxide, Organic Gaseous Compounds and Soot and some manufacturers have embraced CET as a means of achieving these limits.

However, the retrofitting of a MidCat, will significantly reduce the levels of many of these harmful emissions, and it’s fitment to some existing stoves would in many cases meet or exceed the requirements of this new directive.

How is it fitted?

The MidCat is easily installed, by a registered fitter immediately above the stove, by simply removing the lowest section of the existing metal flue pipe. Its compact design offers a neat integration between stove and flue. An ideal opportunity for installation is during a routine sweep of a stove’s chimney, when the flue will be opened and the MidCat can be installed with no additional fuss or mess.

Is it easy to use, once installed?

The catalytic converter element has an open and closed position, when open, the smoke by-passes it, with no treatment, and when closed the smoke passes through it and is scrubbed clean.

Where can I buy one and how do I know which one I need?

You can order your MidCat here today. It is available in two different lengths to ideally address the situation of all fires without a negative impact on the appearance of the stove.

The MidCat 500 is ideal for most installations. It features an access door which allows the chimney to be swept with minimal fuss or mess. Depending on the position of your stove you can specify whether you want the door on the front or back of the MidCat.

The MidCat 250 is ideal for small or enclosed spaces. We recommend using this one only where you have limited space between the tube and the stove chamber.

Who can install The MidCat?

The MidCat can be installed by any competent person. This includes Chimney Sweeps and Installers from organisations such as The Guild of Master Chimney Sweeps, NACs, APICS, Sweep Safe and HETAS etc.

Click here to find a Guild of Master Chimney Sweep and using your postcode you can find a list of registered chimney sweeps and fitters in your area.

Does my MidCat come with a warranty?

Yes! We offer a lifetime guarantee on any MidCat you purchase from us. So for as long as you have your stove and it is properly maintained in accordance with the manufacturers specifications, we will honour the warranty on your MidCat.





MidCat Pipe Length



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We have been working closely with our manufacturing team and our courier services and as ever thankful for their continued hard work.

Chimney Cowl Products is a family run business passionate about what we do. We have been selling our amazing range of Chimney Cowl Products for over 15+ years and we are very much looking forward to the next 15+ years.

The whole family is involved. My daughter at the age of 6 helping mum wrap and stick labels onto orders and my son helps dispatch orders at the local post office (I do my bit too, promise).

Our Delivery Service

We reap the rewards of the very best postal prices form our courier and always amazed how they can deliver over 95% of our orders from our doorstep to your doorstep in just 24 hours and in most cases for less than £10.

We are with you at every step and if you would like to take advantage of our great range of products, ordering online could not be easier. Please simply select your desired product, add it to your basket and follow our secure checkout procedure. Upon receipt of your order we will process with an immediate effect.

Best wishes

Chimney Cowl Products

COVID-19 Delivery Options

Hello, just an update in regards to our delivery services – we are dispatching our range of Chimney Cowls and Disused Chimney Caps from our warehouses to our customers throughout the UK and following all recommended safe working Government practices.

Our orders are dispatched safely and securely via our courier services and they have been providing an amazing service for not just ourselves but many thousands of business throughout the UK and we offer our sincere appreciation.

We have a a great delivery rate from our courier and it always amazes me how cost effective their professional service is from collection to door to door delivery.

If you wish to have your delivery put into a safe place or have any special delivery instructions we can happily accommodate this and please leave a message within the delivery section of the checkout process. We can then ensure that there is no personal interaction at any time with yourselves and our courier service.

Please take care and we look forward to dispatching your order.

Choosing the Correct Size

Its sometimes difficult to choose the correct size of Chimney Cowl. We have the perfect solution and can be done from ground level as well.

If you can accurately guess the size or width of the chimney pot from the floor you can order the right Cap or Cowl from Chimney Cowl Products. The good news is this is relatively easy once you know the rough size of a house brick and the thickness of the walls of a chimney pot.

Using either the naked eye or a set of binoculars get a ‘side on’ view of the chimney pot you wish to cap or fit a chimney cowl, then find a full sized brick nearest to the chosen pot as a reference, normally directly underneath.

Now imagine that the brick is placed on top of the chimney pot itself and make a mental note whether it would fit inside, hang over, or sit flush. It may sound silly but once you know that the width of an average UK house brick is 225mm ( 9″ ) for imperial or 215 ( 8 and half ” ) on a modern property, it provides a very accurate impromptu tape measure.

The other factor you may need is internal pot size, this can also be guessed quite accurately if you know the average thickness of a chimney pot is about 25mm ( 1″ ) , simply factor this in and you can work out most chimney pot width’s quite accurately.

If you have large decorative rolls on top of the pot, make an allowance for this by guessing, using a brick as your guide.
Chimney Cowl Products - Your family run business proudly capping the UK for over 15 years...
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