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Old 01-22-2012, 07:09 PM   #1
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HVAC air intact connected to Dormer Vent in roof


I had a 20 year old Lennox HVAC replaced with a new Lennox condensor and HVAC. The condensor is outside and HVAC, a G60UH60C, installed horizontally in the attic.

I had reason to be up in the attic checking for roof leaks and noticed that what appears to be a 6" flex duct runs from the inledt side of the unit to the bottom of a dormer duct. The tubular section of sheet metal that the flex conduit actually attaches to is strapped to the bottom of the dormer. No conduit actually runs up into the dormer or above the dormer bottom.

My concern is that instead of pulling in outside air the conduit may be sucking in attic air.

Is this a problem or is the installation all right?

Thanks

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Old 01-23-2012, 12:00 AM   #2
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HVAC air intact connected to Dormer Vent in roof


a picture would REALLY help..........but it sounds like a lose return run....

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Old 01-23-2012, 12:08 AM   #3
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HVAC air intact connected to Dormer Vent in roof


Sorry. I should have gotten some pictures and will take some. It's just a bit difficult to get access to a point from which I can get a shot of the connection to the dormer vent.

It has been a while, but I onece ran a 1970 HD sporster XLH amd worked as a part time mechanic for the local HD dealer.

Last edited by Klawman; 01-23-2012 at 12:10 AM.
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Old 01-23-2012, 12:20 AM   #4
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HVAC air intact connected to Dormer Vent in roof


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Sorry. I should have gotten some pictures and will take some. It's just a bit difficult to get access to a point from which I can get a shot of the connection to the dormer vent.

It has been a while, but I onece ran a 1970 HD sporster XLH amd worked as a part time mechanic for the local HD dealer.
I dont ride anymore either........medical reasons
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Old 01-23-2012, 09:03 PM   #5
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HVAC air intact connected to Dormer Vent in roof


The first picture is the conduit's attachement to the roof vent.

The next shows how the flex conduit hangs from the one place it is attached with strapping to some framing. In the back of that picture you see how the flex fits terminates at the hvac.

The third is a closeup of the far side of what the flex runs to.

The last picture is an exterior shot of the dormer roof vent.
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Last edited by Klawman; 01-23-2012 at 09:13 PM.
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Old 01-23-2012, 11:30 PM   #6
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HVAC air intact connected to Dormer Vent in roof


some areas require a certian amount of fresh air to be brought into the structure.........i am guessing thats what this is
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Old 01-24-2012, 02:12 AM   #7
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HVAC air intact connected to Dormer Vent in roof


That is obviously why the line is hooked to the bottom of an air vent. My concern is the way it was done the mouth of the duct can pick up a lot of attic air.
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Old 01-24-2012, 09:25 AM   #8
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HVAC air intact connected to Dormer Vent in roof


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That is obviously why the line is hooked to the bottom of an air vent. My concern is the way it was done the mouth of the duct can pick up a lot of attic air.
Yes i see that, but since the attic is connected to the outside via the same vents.....out side air and attic air are one in the same.......although i would perfer 100% OUTSIDE AIR
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Old 01-24-2012, 11:59 AM   #9
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HVAC air intact connected to Dormer Vent in roof


Thanks Harley.

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