Hello, I’m struggling to control the condensation buildup we’re experiencing. The ducts for our ventilation system pass through the utility room wall into the garage and from there through the wall to the outside. We have a double outlet side by side. Condensation always forms on the exhaust hood, as shown in the pictures.
About half a liter of water accumulates quickly, which then collects inside the duct. I only noticed this when it started dripping in the garage (where the duct meets the exterior wall).
At first, I thought it was rainwater because there was so much water inside the duct. In a test, water also entered the duct when I poured water over the cover from above. I therefore screwed a metal sheet over it. The metal sheet extends outward to prevent driving rain from entering.
I’ve also already screwed the cover at an angle so most of the water runs off the front. Inside the cover, I applied a thin silicone bead to prevent water from flowing back.
Of course, the manufacturer has already been involved here. They said they had never seen anything like this before.
No condensation forms on the duct itself; it is always dry when I check. It’s the exhaust hood that causes the condensation.
What are your ideas? Different exhaust hood? Do you know of anything like this? The system is from Vallox.
About half a liter of water accumulates quickly, which then collects inside the duct. I only noticed this when it started dripping in the garage (where the duct meets the exterior wall).
At first, I thought it was rainwater because there was so much water inside the duct. In a test, water also entered the duct when I poured water over the cover from above. I therefore screwed a metal sheet over it. The metal sheet extends outward to prevent driving rain from entering.
I’ve also already screwed the cover at an angle so most of the water runs off the front. Inside the cover, I applied a thin silicone bead to prevent water from flowing back.
Of course, the manufacturer has already been involved here. They said they had never seen anything like this before.
No condensation forms on the duct itself; it is always dry when I check. It’s the exhaust hood that causes the condensation.
What are your ideas? Different exhaust hood? Do you know of anything like this? The system is from Vallox.
Bookstar schrieb:
Normally, there is a condensate drain on the exhaust pipe OR, like we did, the pipe runs underground with a drainage and soakaway system. In that case, the slope naturally needs to lead away from the house.
Both methods work perfectly. Unfortunately, I don’t know that. I’ve never seen it or been offered it. I have considered something like that as an emergency solution. But in the garage, I can’t create a proper drain anymore.
Here are some pictures of the pipe layout. In the garage, the pipe goes down again and then passes through the exterior wall (to the right of the door). That’s where it accumulates. So far, the only drain is inside the ventilation unit itself.
I don’t understand the following:
How can the water flow back into the pipe if the exhaust vent is constantly running? It should actually be blowing the droplets outside. Otherwise, you could check the slope of the ceiling pipe in the garage. It looks to me like it might be sloping in the wrong direction.
How can the water flow back into the pipe if the exhaust vent is constantly running? It should actually be blowing the droplets outside. Otherwise, you could check the slope of the ceiling pipe in the garage. It looks to me like it might be sloping in the wrong direction.
rick2018 schrieb:
As @Bookstar mentioned, a condensate drain is usually installed.
I would suggest contacting the company that did the installation... I need to find out more about this. The company that did the installation is no longer reachable for us. After several defects and deadlines we set, the work was ultimately repaired by another company. However, that only involved bathroom fittings. I have already contacted other companies about minor issues, but due to the history, none of them want to take the risk. Their first question is always, "Who installed it?"
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