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renof20036 Jul 2017 19:28Hello everyone,
We have a small garden shed (concrete building) with a pitched roof. Inside, there is an open fireplace with a chimney above it.
The problem is that the chimney simply does not draft properly. The room fills up heavily with smoke, making it almost impossible to grill on the fireplace.
I have attached a sketch and hope it clearly shows how the area is constructed.
Notes:
- Maybe the wood funnel (wood chute) is positioned too high and should lead directly into the opening so that smoke cannot accumulate between the wood funnel and the chimney.
- The chimney at the top might be undersized, as it is slightly shorter than the roof peak (it is not blocked).
- There is sufficient air supply in the room.
- The chimney diameter might be too small, max. 10cm (4 inches).
- Perhaps the distance between the wood funnel and the fireplace is too large (probably bigger than shown in the sketch).
Could someone help and suggest what factors might be causing the chimney not to pull the smoke out properly and what measures could improve the situation?
Thanks in advance
We have a small garden shed (concrete building) with a pitched roof. Inside, there is an open fireplace with a chimney above it.
The problem is that the chimney simply does not draft properly. The room fills up heavily with smoke, making it almost impossible to grill on the fireplace.
I have attached a sketch and hope it clearly shows how the area is constructed.
Notes:
- Maybe the wood funnel (wood chute) is positioned too high and should lead directly into the opening so that smoke cannot accumulate between the wood funnel and the chimney.
- The chimney at the top might be undersized, as it is slightly shorter than the roof peak (it is not blocked).
- There is sufficient air supply in the room.
- The chimney diameter might be too small, max. 10cm (4 inches).
- Perhaps the distance between the wood funnel and the fireplace is too large (probably bigger than shown in the sketch).
Could someone help and suggest what factors might be causing the chimney not to pull the smoke out properly and what measures could improve the situation?
Thanks in advance
B
Baustelle20168 Jul 2017 14:16How tall should the chimney be? For a wood stove, a height of about 3.5m (11.5 feet) is usually enough to ensure proper draft. For an open fireplace, it generally needs to be significantly taller. A professional stove fitter or the local chimney inspector can provide guidance. The chimney inspector will also need to officially approve the installation. DIY without expert advice is not recommended, as smoke is not only unpleasant but also toxic. Carbon monoxide can kill quickly. So, don’t take any risks and get help from a qualified planner who knows what they’re doing. This won’t cost a fortune, but poor workmanship can cost your life.
In summer, you will probably get little use out of the fireplace anyway. When the indoor temperature is lower than the outdoor temperature, the pressure differences become unfavorable, so even a tall chimney alone may not provide adequate draft. In these cases, there are electric smoke extraction systems (a type of fan) that can be installed at the top of the chimney.
In summer, you will probably get little use out of the fireplace anyway. When the indoor temperature is lower than the outdoor temperature, the pressure differences become unfavorable, so even a tall chimney alone may not provide adequate draft. In these cases, there are electric smoke extraction systems (a type of fan) that can be installed at the top of the chimney.
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renof20039 Jul 2017 18:33Thank you for the response!
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