We get a lot of customers complaining about the draught that comes through air vents. The air vent is there to provide enough oxygen for your appliances when they are burning fuel. If they don’t get enough oxygen they produce carbon monoxide which is a killer. So the air vent is pretty useful when you’ve got a fire lit. But what about all the rest of the time, when the fire isn’t lit and there’s still a howling gale blowing through? Wouldn’t it be great to have something that restricted the air flow and prevented those annoying draughts? Ta daaa! We introduce the DR21, invented by David Gattie, a stove fitter with customers putting just such a complaint to him on a regular basis.
It is easily fitted onto the outside wall in place of the existing vent. There are no moving parts, just a clever design inside that zigzags the air, slowing it down, so it doesn’t rush in through the vent. If a greater amount of air is needed because the appliance is burning, the air can come in as fast as it likes, and if the appliance isn’t lit the air will just trickle in giving you just the amount of ventilation you need.
How does the DR21 air vent cover work?
A standard louvered vent basically lets air blow straight through the wall. The DR21 disrupts the airflow so that it can’t just blow straight in. However as soon as you light your fire and need more air for it to burn efficiently, the air will travel through the DR21 more quickly. Have a look at this video for a demonstration on how it works.
How do you fit the DR21 air vent cover?
If there’s already a hole drilled through with a louvred vent fitted, it’s really easy. Simply remove the louvered vent, drill holes for the back plate of the DR21, fix the back plate to the wall, pop in some adhesive and fix in the top plate. Have a look at this video for an installation demonstration.
If you’re just about to have a wood burning stove fitted then it’s likely the installer will need to drill a hole in the wall behind the stove in order to create sufficient ventilation. In that case show them your DR21 that you’ve just purchased and ask them to fit that instead of the standard louvred grille they were just about to put in place for you.
You can see the full instructions that come with the DR21 air vent cover here.
Why do we need vents?
All appliances that burn with a flame, including gas stoves, gas fires, boilers and wood burning stoves, need air as part of the combustion process. It is the reaction of oxygen with fuel that creates heat. Just as we need air to breathe and generate our own energy, so too does fire. And it needs a surprising amount of air in order to do this. Air contains just 20% oxygen so a lot of air is needed to supply what’s required. Older houses were built with little insulation and ill fitting windows, so basically had vents as part of the fabric of the structure. As buildings have become more air tight, or as insulation measures have been retro-fitted, it’s very important to make sure that all appliances that burn have a good enough air supply. If a fire doesn’t get a good enough supply of air it won’t burn properly and will produce carbon monoxide. To ensure your home is safe, it is worth having a carbon monoxide detector in your home if you've got a gas supply.
We get a lot of customers complaining about the draught that comes through air vents. The air vent is there to provide enough oxygen for your appliances when they are burning fuel. If they don’t get enough oxygen they produce carbon monoxide which is a killer. So the air vent is pretty useful when you’ve got a fire lit. But what about all the rest of the time, when the fire isn’t lit and there’s still a howling gale blowing through? Wouldn’t it be great to have something that restricted the air flow and prevented those annoying draughts? Ta daaa! We introduce the DR21, invented by David Gattie, a stove fitter with customers putting just such a complaint to him on a regular basis.
It is easily fitted onto the outside wall in place of the existing vent. There are no moving parts, just a clever design inside that zigzags the air, slowing it down, so it doesn’t rush in through the vent. If a greater amount of air is needed because the appliance is burning, the air can come in as fast as it likes, and if the appliance isn’t lit the air will just trickle in giving you just the amount of ventilation you need.
How does the DR21 air vent cover work?
A standard louvered vent basically lets air blow straight through the wall. The DR21 disrupts the airflow so that it can’t just blow straight in. However as soon as you light your fire and need more air for it to burn efficiently, the air will travel through the DR21 more quickly. Have a look at this video for a demonstration on how it works.
How do you fit the DR21 air vent cover?
If there’s already a hole drilled through with a louvred vent fitted, it’s really easy. Simply remove the louvered vent, drill holes for the back plate of the DR21, fix the back plate to the wall, pop in some adhesive and fix in the top plate. Have a look at this video for an installation demonstration.
If you’re just about to have a wood burning stove fitted then it’s likely the installer will need to drill a hole in the wall behind the stove in order to create sufficient ventilation. In that case show them your DR21 that you’ve just purchased and ask them to fit that instead of the standard louvred grille they were just about to put in place for you.
You can see the full instructions that come with the DR21 air vent cover here.
Why do we need vents?
All appliances that burn with a flame, including gas stoves, gas fires, boilers and wood burning stoves, need air as part of the combustion process. It is the reaction of oxygen with fuel that creates heat. Just as we need air to breathe and generate our own energy, so too does fire. And it needs a surprising amount of air in order to do this. Air contains just 20% oxygen so a lot of air is needed to supply what’s required. Older houses were built with little insulation and ill fitting windows, so basically had vents as part of the fabric of the structure. As buildings have become more air tight, or as insulation measures have been retro-fitted, it’s very important to make sure that all appliances that burn have a good enough air supply. If a fire doesn’t get a good enough supply of air it won’t burn properly and will produce carbon monoxide. To ensure your home is safe, it is worth having a carbon monoxide detector in your home if you've got a gas supply.
DR21 Air Vent Cover
10 reviews
Energy saving
Money saving
The DR21 air vent cover fits easily in place of louvred air vents and prevents annoying draughts from blowing through into your home.
£28.50
In Stock
1/2
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Standard delivery
Free when you spend over £30 or £3 for orders under £30.
Delivered within 2-4 working days from the date of dispatch.
Smaller items will be delivered using Royal Mail 48. Larger items will be delivered by Fedex or ParcelForce.
Delivery Monday to Saturday (excluding bank holidays).
Expedited delivery
£6 for all orders.
A fully tracked service, delivered within 1-3 working days, from the date of dispatch.
Smaller items will be delivered using Royal Mail 24. Larger items delivered via FedEx or ParcelForce.
Delivery Monday to Saturday (excluding bank holidays).
We have a 60-day return policy, which means you have 60 days after receiving your item to return it.
To be eligible for a return, your item must be in the same, re-sellable condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
The postage cost for the return will need to be covered by yourself (please keep the proof of postage until your return has been processed).
At the core of Chimney Sheep is our Community Interest Company, Buy Land Plant Trees (BLPT). For every purchase you make with us, 20% of the profit facilitates the planting of trees on agriculturally poor land in Cumbria.
We set up BLPT in 2019 as a ‘boots on the ground’ tree planting initiative. The company is run by us and the tree planting is done by us. We do it to help you and us to reduce our impact on the planet. The trees we plant reduce CO2 output as well as contribute to the reduction of flooding and the creation of habitats for wildlife.
BLPT isn’t a tick box exercise nor a distant and detached carbon offset company. In fact, this is as much part of our business as the products we sell and is an integral part of our ethos. We are big believers in the phrase ‘think globally, act locally’ and want to make a genuine difference
A Chimney Sheep® draught excluder is a brilliant tool for any property with an open chimney. But don’t just take our word for it...
Let customers speak for us
from 5048 reviews
Eco Friendly Weed Control
I bought this as I wanted a non-plastic weed suppressant to use under stones and bark and this is ideal as it can be bought by the metre rather than having to buy far more than I need (though it does make it more expensive per metre). It is easy to use and I'm really pleased that it is a natural material with no plastic. I'm wondering how long it will last before it needs replacing, but for now, I'm really pleased with my purchase.
I ordered two of the 10kg...in error! There's a massive amount of wool in each bag and, to my mind, it's quite clean. It's very thick and has a high amount of lanolin in it, a good sign.
I placed it around my runner beans and French climbing beans. The wool provides support when it's windy. Round the tomatoes, the courgettes and...the potatoes. They thrive on it.
Important: the will deters slugs etc, but my advice is that it's essential to keep the wool moist. Not sodden, as the wool is superb at preventing the soil drying out.
Well worth it.
Delivery box was a bit battered on arrival so feared for the pots, but the sheep's wool had kept them safe. Brilliant non plastic option to keep seedlings watered without wasting water and the wool works to keep slugs at bay.
Bought these as the fluffy inside lining of my slippers had worn down to the rubber! I hate waste and didn’t want to throw them away as they were in otherwise good condition, so I bought these and popped them in and now I have warm and comfy insides to my slippers again - Hurrah!! Slipper life extended and waste reduced. Very glad to have found this company 😊.
We have an open fire that is only used a few times a year but don't want to decommission it.
When not in use there is a noticeable draft that comes down the chimney this includes the smell from our neighbours log burner when the wind blows the wrong way.
Enter stage left the Chimney Sheep. I measured up the chimney aperture and placed my order. Despite Royal Mails best efforts it arrived well packed and in good order.
It's a neat product and having attached the handle shoved it up the chimney. Perfect fit. Can't be that easy surely? Yep.
There is a fob that attaches to the handle that dangles down from the chimney so that you are reminded that the Chimney Sheep is in situ before lighting a fire.
I can't comment on the draught excluding properties yet as the weather has been glorious since I got it, but I see no reason it won't be effective. I no longer have to listen to the pigeons serenading each other though.
My first purchase of three ply…I will buy more….this is good stuff….does the job….soft enough…AND made in uk from uk waste paper…this is important if you are thinking green….no point buying recycled paper which has been round the world and back. We have loads of waste paper to use in the uk and loads of uk bottoms to wipe 😂
Amazing felt, thick and really good quality. Worked amazing by for my art project. I love both the colour and the texture! Excellent delivery and costumer service.
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