Improve your Woodburner

Watch us on Dragon's Den (broadcast September 2018) here:

Following the appearance, we have been selected as the winners of the "Flueing & Ventilation Product of the Year" Award at the 2019 Hearth & Home Exhibition:

The DR21 air vent is available at most good stockists.


DR21 stockists

Individual orders for homeowners can be made through this website or via Amazon. If you are a distributor or stove installer, please use our contact form to enquire about bulk purchase prices.

Don't see your favourite supplier listed? Drop us a line.

Reduce draughts, fuel costs and pollution

Reduce draughts, fuel costs and pollution

Most woodburner installations need a four inch hole in the wall. But this hole lets in wind, noise and insects, along with the air supply the stove needs.

The DR21 air vent is a new design which allows air necessary for combustion to be drawn into the room, but stops air being blown in.

You'll be warmer. You'll burn less fuel. And you'll create less pollution.

Watch the demo
Easy to Install

Easy to Install

The DR21 is as easy to fit as a standard louvred vent cover, costs about the same as a bag of wood, and pays for itself in reduced heating costs.

Our installation video shows how to swap a louvred vent for the DR21 in about a minute.

The DR21 is approved by HETAS, and has passed BRE testing for free air equivalence to 3400mm2.

Installation demo
  • HETAS approved for stoves up to 12kW
  • The DR21 uses a labyrinthine baffling system.
  • The DR21 system regulates airflow.
  • Draughts cannot get into the building.

Buy DR21 Draught Reducing Air Vent




  • Easy to install

    Uses the same fittings as a standard louvred vent cover. Watch our installation video here.

  • Provides 3400mm² free air

    The DR21 air vent is approved by HETAS (the governing body for solid fuel burners) throughput equivalent to 3400mm² of free air. It was tested by BRE, according to BSEN13141.


Why do I need an air vent?

Regulations state that all stoves over 5kw must have a dedicated air supply, which cannot be blocked, in houses built before 2008, and all stoves in houses built after 2008 must have a vent regardless of the size of the stove.

Even a stove under 5kw will struggle to be efficient if it lacks an adequate air supply. For a fire to burn efficiently, it need heat, air and fuel. Deprive it of any of these and it will not burn efficiently. What's more, you will increase pollution, as soot particles will be emitted. These will coat your flue, meaning it will have to be swept more often, reducing the life of a liner. The soot then passes into the atmosphere, reducing air quality for you and people around you.

There is also a danger of a build up of carbon monoxide in the room when you don't have an air vent. You may find yourself feeling sleepy when watching the TV, and children in nearby rooms could be affected.

Does your air vent meet HETAS regulations?

Yes, our design meets specifications required by HETAS, and by the HM Government Building Regulations 2010. The DR21 Vent provides throughput equivalent to 3400mm² of free air and was independently tested by BRE.

You can accommodate very powerful stoves (e.g. 15kW or greater) by using two DR21 air vents.

Why can’t I just use a louvred vent?

You can use any type of vent cover you like. However, if you fit a louvred vent cover, or any other type of vent cover which allows air to pass directly through, you will get draughts inside the house. You will also have noise and insects passing into the house. And, you will have higher central heating bills, due to the the cold air blowing into your house through the louvred vent.

Someone else must have thought of this before?

We hold a patent on the design which means that no, this exact design has not been conceived before.

There are several draught-reducing air vents already on the market. All of these are fitted inside the wall. Installing them is a major undertaking, since part of the wall must be knocked down, the vent installed, and then the wall is bricked up around the air vent. Or, for tube designs, a constant diameter hole must be drilled from one side of the wall, rather than two holes drilled from either side which meet in the middle.

Unlike competing designs, the DR21 air vent fits onto the outside of the wall. This means the DR21 is much easier to fit. All you need to do is unscrew the louvred cover, screw the DR21 base unit on using the same fitting holes, and attach the DR21 top section with adhesive. This takes about a minute. Watch our video here.

My stove has an integrated air vent. Do I need a DR21?

Some designs of wood burning stove feature an integral air vent. Such stoves are typically very expensive. You don’t need to use a DR21 air vent with stoves which have integral air vents to prevent a draught in the living room. However, if you do fit a DR21, you will gain the advantage that when the stove is opened (e.g. for lighting or cleaning), dust and ash will not blow into the room. If you are paying over £1000 for a stove, plus the installation fee, you may appreciate a spend of an extra £19.99 on the DR21 air vent to stop the annoyance of extra dust in your living rooms.

What is more, stoves with integral air vents are typically very cold when not lit. This is because they have a direct connection to the outside, through the integral air vent – air from outside will circulate around the stove when it is not in use. So, when unlit, the stove acts in the opposite way to a radiator. It is a giant piece of metal in your living room which will be colder than the rest of the room, and which will cool the room. This means that your central heating bills will be higher, since you must compensate for the effect of the stove cooling down the room when not in use. The coldness of the stove also means it will be more difficult to light, and will take longer to heat up than a stove without an integral air vent.

Installing a DR21 vent onto your stove with integrated air vent overcomes all of these problems.

Does it come in any other colours?

You can paint the DR21 any colour you like. You need to use an enamel paint. Enamel paint is widely available in hardware stores. It's usually found in a spray can, in store areas aimed at home/garden applications, or DIY/modelling. Typical costs are just a few pounds, and colours vary by brand.