Blower-Door-Test - Is the fireplace room-air dependent?

I wonder why you put so much value on the bdt. You won’t fail because of the opening in the chimney.

The drilling of the holes (exhaust + supply air) can be done beforehand, but it may look worse than necessary. Especially if the chimney also has exhaust air to the back, the drilling behind must be quite precise. Of course, if you go up with a pipe piece and then a bend, the height is irrelevant. But it doesn’t look as nice either.

Attached are 2 pictures of our chimney. We have exhaust air to the back and supply air directly at the floor.

Thank you, that reassures me. Then I will definitely have the holes drilled beforehand. I have the Hark 1/223.0, there are no visible pipes.

The fireplace looks really stylish. Have fun with it. A lot of glass also means a lot of cleaning ^^

You can definitely have the holes drilled beforehand. At the BDT, the holes are simply sealed. You could inform the tester about it in advance by email, otherwise, he will find out anyway since he will be looking for the cause of the faulty test. They have great equipment and will notice it immediately.

Hello,

I am now more confused than before, as I have spoken again with the chimney sweep and with Hark.

A room-air-independent fireplace does not take its fresh air from the installation room but, as in our example, from the chimney, which has a separate LAS to supply fresh air.

The fireplace is still room-air-dependent because it probably did not pass the airtightness test or it was not done. I cannot find any information about this at Hark.

The chimney sweep did write the statement but did not know that we have a comfort ventilation system nor that it is a passive house. Are we doing something wrong?

Hello,

I am now more confused than before, as I have spoken again with the chimney sweep and with Hark.

spoken with both and still no solution found?

A room air-independent fireplace does not draw its fresh air from the room where it is installed but, as in our example, from the chimney, which has a separate LAS to supply fresh air.

that is correct. a room air-independent fireplace draws its fresh air through the chimney, which structurally consists of 2 chambers (supply and exhaust air).

The fireplace is still room air-dependent because it probably did not pass the tightness test or it was not done. I cannot find any information about this at Hark.

I could not find any information when googling whether the selected fireplace can even draw its fresh air via the chimney. according to the technical drawings, it does not look like it. it probably draws its air through the slits at the bottom.
this would make the selected fireplace unusable unless you can prove the fresh air supply by calculation. this is very difficult in new buildings.

The chimney sweep did write the statement but did not know that we have a comfort ventilation system nor that it is a passive house. Are we doing something wrong?

what kind of statement? you should go to a proper fireplace dealer and get advice. this will not work like this. until then, do not drill a hole in the chimney!

the proper way would be:

- decide to build with a fireplace
- submit a combustion application (usually via the construction company, if they are also building the chimney) to the district chimney sweep
- clarify with the district chimney sweep which measures he requires for acceptance when using a ventilation system
- with this information, go to the fireplace seller and order the suitable fireplace
- after completion of fireplace + chimney, have the district chimney sweep inspect the system
- light the fireplace and enjoy

in my opinion, the selected fireplace is not suitable here. in this price range, I would not buy a fireplace without professional advice! the big fireplace sellers are themselves chimney sweeps and know the important aspects.

Yes, yes, the fireplace draws fresh air through the chimney (see attachment). Hark has advised well so far, but our consultant is now sick and the representative is telling exactly the opposite! Is Hark not a good company? I always had the impression that they know what they're doing

The chimney sweep is preparing a statement for us according to § 50 so that the project will be approved.