ᐅ Fireplace Stove External Air Supply – What Is the Best Technology for It?
Created on: 2 Dec 2021 13:54
A
ateliersiegel
Does anyone have information about supplying outside air to a wood stove?
Of course, there need to be some kind of shut-off options so that cold outside air (in winter) does not enter the rooms uncontrollably. I imagine there are different solutions for this (automatic, electric, manual). So far, my search has found few images and very little information on the subject.
What does the access on the exterior of the house look like? What sizes can the supply duct have (minimum diameter)?
We are converting our attic and are currently planning to buy a new stove, but which one it will be is still completely undecided. That’s why I want to make the outside air supply possible, even if it might not be needed.
Honestly, I don’t know exactly when this setup makes sense and when it doesn’t.
1. When using a range hood (cooker hood).
2. When windows and doors are so well sealed that little or no air flows in.
Are there any other advantages to using outside air for a wood stove if these two points do not apply? Or are there disadvantages? Somewhere I read that rust can form inside the stove because of moisture.
Of course, there need to be some kind of shut-off options so that cold outside air (in winter) does not enter the rooms uncontrollably. I imagine there are different solutions for this (automatic, electric, manual). So far, my search has found few images and very little information on the subject.
What does the access on the exterior of the house look like? What sizes can the supply duct have (minimum diameter)?
We are converting our attic and are currently planning to buy a new stove, but which one it will be is still completely undecided. That’s why I want to make the outside air supply possible, even if it might not be needed.
Honestly, I don’t know exactly when this setup makes sense and when it doesn’t.
1. When using a range hood (cooker hood).
2. When windows and doors are so well sealed that little or no air flows in.
Are there any other advantages to using outside air for a wood stove if these two points do not apply? Or are there disadvantages? Somewhere I read that rust can form inside the stove because of moisture.
R
RotorMotor3 Dec 2021 11:08Lumpi_LE schrieb:
But why did you decide against it? An external air intake basically has no disadvantages, only benefits, with hardly any additional costs. It has a major advantage: the hot air exits through the chimney, creating negative pressure inside the house.
As a result, cold air from outside is pulled into the house through all the gaps.
The only requirement is that the house’s blower door test result is poor enough.
This cools the living space comfortably while actually way too much heating energy is introduced into the living area through the fireplace. 😎
H
hampshire3 Dec 2021 11:18I couldn’t quickly find how much air volume is needed for the combustion of one kilogram of wood. Compared to the air volume in the room, this does not create a significant negative pressure, especially since doors or windows are occasionally opened during daily life. This is completely unproblematic. You save yourself extra dampers and the house.
Opening a window makes no difference to the burn for us—not even at the beginning. What matters is that the chimney has a good draft. The wood stove has a bypass damper for starting from a cold state to utilize direct draft. This can be closed after a few minutes.
motorradsilke schrieb:
The fireplace burns great too; when lighting it, it’s useful to open a window for a few minutes.
Opening a window makes no difference to the burn for us—not even at the beginning. What matters is that the chimney has a good draft. The wood stove has a bypass damper for starting from a cold state to utilize direct draft. This can be closed after a few minutes.
R
RotorMotor3 Dec 2021 11:36hampshire schrieb:
I quickly couldn’t find how much air volume is required for the combustion of one kilogram of wood. You can find values like 80m³ of air per 1kg of wood.
So for a 20m² (215 sq ft) living room with a ceiling height of 2.5m (8 ft), the air is completely exchanged 1.5 times per kilogram of wood burned.
And of course, this air comes entirely from outside — where else would it come from?
Given the current outdoor temperatures, that’s really (not) a great thing! 😉
hampshire schrieb:
Opening the window doesn’t make any difference to the burn process for us – not even at the start. Well, then the house must be quite “drafty” even with the windows closed.
Probably no blower door test done?
M
motorradsilke3 Dec 2021 12:02Lumpi_LE schrieb:
Okay, learned something new again 🙂
But why did you decide against it? An external air intake basically has no disadvantages, only benefits with hardly any additional cost. In our case, the difference was the stove. Our chimney can also supply external air. However, we wanted a panoramic wood-burning stove. This way, we were able to buy a good used one for little money; otherwise, we would have had to buy a new one at three to four times the price.
And why should I do that? What disadvantages are there to not having an external air intake, and what benefits should an external air intake provide?
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pagoni20203 Dec 2021 12:45motorradsilke schrieb:
The difference for us was definitely the stove. Our fireplace can also supply outdoor air. But we wanted a panoramic wood-burning stove. That way we could buy a good used one for little money. Exactly the same for us, and for our model, an outdoor air intake module could also be purchased. As often mentioned: call the chimney sweep beforehand, as their position on this is crucial!!!
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