So far, we have spoken with three fireplace installers, and each prefers a different option for the fresh air supply. We will choose a room-air-independent fireplace and therefore need a fresh air supply from outside. The following options were recommended to us:
1. Pipe through the foundation slab with a mushroom vent in the garden
2. Chimney with two adjacent flues, one for exhaust gases and one for fresh air (e.g., Schiedel Xpert)
3. Chimney with concentric fresh air supply (e.g., Erutec FLAS)
Option 1 can be relatively inexpensive, but we don’t want a pipe or mushroom vent visible outdoors.
We like option 2.
Option 3 is supposed to preheat the incoming fresh air, improving combustion. On the other hand, I imagine that the warming fresh air might have difficulty sinking downwards, which could make its functionality dependent on weather conditions and therefore somewhat unreliable.
Do you have any good advice on this?
1. Pipe through the foundation slab with a mushroom vent in the garden
2. Chimney with two adjacent flues, one for exhaust gases and one for fresh air (e.g., Schiedel Xpert)
3. Chimney with concentric fresh air supply (e.g., Erutec FLAS)
Option 1 can be relatively inexpensive, but we don’t want a pipe or mushroom vent visible outdoors.
We like option 2.
Option 3 is supposed to preheat the incoming fresh air, improving combustion. On the other hand, I imagine that the warming fresh air might have difficulty sinking downwards, which could make its functionality dependent on weather conditions and therefore somewhat unreliable.
Do you have any good advice on this?
blockhauspower16 Jun 2016 21:00Then the chimney sweep and the stove fitter should probably have paid more attention in vocational school.
How is that nonsense? Warm air rises, exits the chimney as flue gas, creating a negative pressure that draws in fresh air through the easiest path.
How is that nonsense? Warm air rises, exits the chimney as flue gas, creating a negative pressure that draws in fresh air through the easiest path.
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Sebastian7916 Jun 2016 21:17And that’s exactly why it’s not supposed to work well – no idea. I didn’t want something like that anyway; they just confirmed it for me.
The train didn’t cost me around 1500 euros (about $1600).
The train didn’t cost me around 1500 euros (about $1600).
blockhauspower16 Jun 2016 21:26Most manufacturers offer a round insulated flue pipe. If there is an air gap between the flue pipe and the chimney casing, I have the option to drill into it for fresh air supply. This is not necessary if using a room-air-dependent stove, but it can be done if a room-air-independent system is desired.
It does not cost more, as the chimney construction is designed that way.
It does not cost more, as the chimney construction is designed that way.
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Sebastian7916 Jun 2016 21:36If insulated, you cannot have any air leaks... At least, it would not be approved for that.
blockhauspower16 Jun 2016 21:42That is completely wrong and, in the words of your chimney sweep, "nonsense." The flue pipe is insulated, and the fresh air flows past it alongside.
See, for example, tonatec plus
See, for example, tonatec plus
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Sebastian7916 Jun 2016 22:30With my Schiedel system, it is like this and not possible as you describe.
Otherwise, it would also depend on the indoor air supply.
Otherwise, it would also depend on the indoor air supply.
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