Fireplace stove, independent of room air

....However, we must keep in mind that the stove is not yet able to draw the supply air from the chimney when lighting up. This only works when there is sufficient updraft in the exhaust shaft. For the warming-up phase, we therefore have to leave the stove door ajar so that the stove can easily take the supply air from the room air. Only when the fire is burning properly can we close the door and then the fire will be supplied from the supply air shaft

This means it is not independent of room air. In addition, a warming-up flap seems to be an unknown term.

Regards

Hello €uro,

you are making it too easy for yourself.
The stove was sold to me as room air-independent according to DIN standards, and the chimney sweep also approved it as such.
So the question is how the term "room air-independent" is defined. The ignition phase takes a maximum of 2 minutes for us, then we close the door and the chimney draws. From then on, the stove is supplied exclusively through the external air supply.

The stove builder even advised us against another, more expensive stove from the same manufacturer, as it can only be supplied through external air but does not meet the stricter requirements of room air independence.

I don’t know who among you is right now (you, or our stove builder and chimney sweep). The important thing is that the stove works very well with this chimney, and it does.

Regarding the ignition flap I have researched and found the following:

Quote:
"The ignition flap is a so-called bypass flap for the flue gases.
In unfavorable weather and/or during the ignition phase, the chimney draft is often not strong enough to pull the combustion gases out of the firebox — the stove smokes. The ignition flap 'shortens' the flue gas path. This can be controlled either manually or automatically. Once the chimney draft is re-established, the flap is closed and the flue gases can easily take the longer path through the stove."

Such a flap only makes sense if the flue gases have to travel a long way through the stove until they reach the chimney. This path can be shortened by the flue gas flap to improve the ignition phase.
1. This is initially independent of whether an external air supply is installed or not. That means external air supply is not a mandatory prerequisite for an ignition flap.
2. Only the design of the stove determines the usefulness of an ignition flap. If you cannot shorten the exhaust gas path because the shortest possible path is already given, such a flap does not help either. This is the case, for example, with our Swedish stove.

Ultimately, it is like this:
The chimney itself functions as the motor for the air draft through the stove. Only when the chimney is sufficiently filled with warm air is the rising air strong enough to pull the exhaust gases out of the stove and bring in fresh air.

In modern low-energy houses, stoves with very low output are often used because otherwise, it simply gets too warm. We only have a 4kW stove, which is completely sufficient to comfortably heat our living area.
How a stove with such low heating power should manage to start the chimney motor without help... I think that is exactly the problem of the people mentioned by Stefanlein, who have the air supply connection uninstalled again.

Yalta

...you are making it too easy for yourself. The stove was sold to me as room air independent according to DIN standard and the chimney sweep approved it as such.

Which does not mean that it actually is Please check the DIBT approval number (certificate)!

...I researched the ignition flap and found the following:
Such a flap only makes sense if the flue gases have to travel a long way through the stove before they reach the chimney. This path can be shortened by the flue gas flap to improve the ignition phase.

Absolutely right, because long paths guarantee highest energy efficiency!

...Ultimately, it is like this:
The chimney itself functions as an engine for the draft through the stove. Only when the chimney is sufficiently filled with warm air is the rising air strong enough to pull the exhaust gases out of the stove and bring in fresh air.

Mistake, even with cold air there must be sufficient draft, possibly with the effect of an ignition flap. That is what it is intended for after all!

best regards

Hello,

I’m bringing this topic back up from the "depths."

We are planning a controlled residential ventilation system and also want a fireplace. We understand that we won’t be able to avoid a pressure monitor, but that’s not the question.

So far, we have always assumed that a chimney with air supply should be sufficient. We recently visited a fireplace expert who recommended air supply via a KG pipe laid under the floor slab. Basically, that sounds interesting and logical.

So much for the introduction... What we basically see is that with this solution, we are bringing a source of cold into the well-insulated house. How do you see that or what do you think about it?

Thanks...

the rooms on the upper floors are not heated.

which by the way is an ADVANTAGE and not a disadvantage. we use exactly the same method and if it got warm upstairs, our bedroom would be a sauna. when we want to heat the whole house, we open the living room door and let the heat rise upstairs through the hallway. the less heat is wasted anywhere in the house, the better the chimney is insulated, the faster the stove burns cleanly and the less loss there is (heat in the room where you are heating)

which by the way is an ADVANTAGE and not a disadvantage. we have exactly the same system and if it gets warm upstairs, our bedroom becomes a sauna. if we want to heat the whole house, we open the living room door and let the heat rise upstairs through the hallway. the less heat is wasted anywhere in the house, the better insulated the chimney is, the faster the stove burns cleanly and the less loss there is (heat in the room where you are heating)

Hello Payday,

The reply to a three-and-a-half-year-old post.... Still, thanks!

But an idea or an answer to my question doesn’t seem to be that easy... Maybe someone else can say something about it. Thanks.