Hello forum,
I have a mechanical ventilation system from Vallox (model 350SE).
The supply air duct (cold outside air) goes directly outside next to the basement door.
Unfortunately, condensation forms there and eventually causes mold.
The basement temperature is on average around 17-20°C (63-68°F).
I would like to ask for your opinion on which corrective measure makes the most sense.
1. Insulate the duct more (I have already used insulation tape, but it didn’t help)
2. Build a styrofoam box around the duct (up to the door) to maximize insulation
3. Install a door with better insulation properties (currently it’s a cheap door from a hardware store with little or no insulation)
4. Route the supply air duct further away from the door frame to the outside (this wouldn’t require drilling a core hole or using angled ducts)
Thanks in advance for your feedback!
I have a mechanical ventilation system from Vallox (model 350SE).
The supply air duct (cold outside air) goes directly outside next to the basement door.
Unfortunately, condensation forms there and eventually causes mold.
The basement temperature is on average around 17-20°C (63-68°F).
I would like to ask for your opinion on which corrective measure makes the most sense.
1. Insulate the duct more (I have already used insulation tape, but it didn’t help)
2. Build a styrofoam box around the duct (up to the door) to maximize insulation
3. Install a door with better insulation properties (currently it’s a cheap door from a hardware store with little or no insulation)
4. Route the supply air duct further away from the door frame to the outside (this wouldn’t require drilling a core hole or using angled ducts)
Thanks in advance for your feedback!
Lüftung_KWL_30 Jan 2018 20:41Thank you for all the responses.
I will check the tightness of the wall penetration over the weekend and, if necessary, seal it with silicone from both the inside and outside.
I already sealed the door frame once with silicone because I thought there was a draft there, but that did not help.
I will also check whether the door frame fits properly or if there is a gap behind it.
I will check the tightness of the wall penetration over the weekend and, if necessary, seal it with silicone from both the inside and outside.
I already sealed the door frame once with silicone because I thought there was a draft there, but that did not help.
I will also check whether the door frame fits properly or if there is a gap behind it.
Lüftung_KWL_30 Jan 2018 20:48Oh, one more thing: what’s the best way to clean up this mess?
Sagrotan mold remover from DM?
Sagrotan mold remover from DM?
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Baumfachmann30 Jan 2018 23:27The most effective mold removers are those containing chlorine. It is important to let them sit for a long time and to repeat the application.
If you cannot get something like that, then Mellerud is not bad either; here, too, repeat the application even if no mold is visible anymore.
The mold remover from Sagrotan is also not bad if you cannot get chlorine-based products.
If you cannot get something like that, then Mellerud is not bad either; here, too, repeat the application even if no mold is visible anymore.
The mold remover from Sagrotan is also not bad if you cannot get chlorine-based products.
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Baumfachmann30 Jan 2018 23:30For sealing, use PU foam whenever possible.
Lüftung_KWL_9 Nov 2018 15:19So, a bit late, here is my feedback:
It is dry!!!
Even at freezing temperatures.
It was definitely due to the small air gap in the external pipe.
Thank you very much for your tips!
It is dry!!!
Even at freezing temperatures.
It was definitely due to the small air gap in the external pipe.
Thank you very much for your tips!
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