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  #1  
Old 10/3/12, 7:49 PM
Jim Horton's Avatar
Jim Horton Jim Horton is offline
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Default Air Return question

2001 modular home with a 1992 Coleman furnace. (down-flow)
Problems:
1)No return air grill(s) found.....
2)No furnace filters found....

Take a look at the photo's and give me your advise.
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air-return-question-100_6584.jpg   air-return-question-100_6585.jpg   air-return-question-100_6637.jpg  
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  #2  
Old 10/3/12, 8:06 PM
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Default Re: Air Return question

The unit is probably centrally located. The return air is the grill you are looking at in your pic. I assume the door is provided with louvers.

Pretty common in modulars.

The filter is either in the door you took off, is missing or is supposed to be behind the cover in your pic.

What are you showing in pic 2?

If that is B vent it needs 1" clearance to combustibles.



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  #3  
Old 10/3/12, 8:31 PM
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Default Re: Air Return question

Quote:
Originally Posted by mlarson View Post
The unit is probably centrally located. The return air is the grill you are looking at in your pic. I assume the door is provided with louvers. Yes

Pretty common in modulars.

The filter is either in the door you took off, is missing or is supposed to be behind the cover in your pic.

What are you showing in pic 2? The top of the furnace.

If that is B vent it needs 1" clearance to combustibles. Yes it is a B vent.
It looks to me the large flex duct goes to the roof at the much smaller 2" pvc vent, drawing outside air.
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  #4  
Old 10/3/12, 9:40 PM
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Default Re: Air Return question

Where r all the HVAC guru's????
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  #5  
Old 10/3/12, 11:30 PM
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Default Re: Air Return question

were was the condenser ?



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  #6  
Old 10/3/12, 11:48 PM
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Default Re: Air Return question

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Originally Posted by wwilson3 View Post
were was the condenser ?
Not sure I understand what you are getting at?
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  #7  
Old 10/4/12, 2:09 AM
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Default Re: Air Return question

The top cover grill should have the air filter. The top of the unit contains the blower (pulling air from the living area). More than likely that unit is located in the laundry room, correct? No closet door covering the unit, correct? If so, then door should be louvered/vented. The door or wall between the laundry room and living area should also be vented as to pull air from the living area.




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Last edited by mhazelwood; 10/4/12 at 2:13 AM..
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  #8  
Old 10/4/12, 7:29 AM
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Default Re: Air Return question

Quote:
Originally Posted by mhazelwood View Post
The top cover grill should have the air filter. The top of the unit contains the blower (pulling air from the living area). More than likely that unit is located in the laundry room, correct? No closet door covering the unit, correct? If so, then door should be louvered/vented. The door or wall between the laundry room and living area should also be vented as to pull air from the living area.
Yes, correct on all accounts.
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  #9  
Old 10/4/12, 7:43 AM
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Default Re: Air Return question

I've got the answers for the initial two questions, with your guys input, thank you.

On the top of the furnace, Is this a correct installation where the (larger)flex duct going to the (smaller) pvc pipe through the roof?

And as Michael pointed out about the 1" clearance. I can see where I need to call this out,

If that flex duct is drawing outside air through that small hole in the roof, with no rain cap, then why not just do away with the flex duct?
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  #10  
Old 10/4/12, 11:30 AM
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Default Re: Air Return question

I was out of town and on a roof last evening I am struggling with the thought that the 2 inch is outside air looks like a standard plumbing vent.

I need to know what the flex duct connects to at the furnace or does it. Down flow furnace with supply registers in the floor and the return on the front of the furnace that flex duct makes no sense



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  #11  
Old 10/4/12, 11:38 AM
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Default Re: Air Return question

Quote:
Originally Posted by cbottger View Post
I was out of town and on a roof last evening I am struggling with the thought that the 2 inch is outside air looks like a standard plumbing vent.

I need to know what the flex duct connects to at the furnace or does it. Down flow furnace with supply registers in the floor and the return on the front of the furnace that flex duct makes no sense
I agree with all you say as that is what my thoughts were. The flex duct connects to a flange at the top of the furnace, I assume for the return air.

It does not look right but I (like you) cannot understand why it was done this way. Puzzling???
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  #12  
Old 10/4/12, 11:46 AM
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Charley L. Bottger Charley L. Bottger is offline
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Default Re: Air Return question

Surley the flex is part of the return could you see where it terminated above the furnace or did it just disappear into an attic area



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  #13  
Old 10/4/12, 11:55 AM
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Default Re: Air Return question

Quote:
Originally Posted by cbottger View Post
Surley the flex is part of the return could you see where it terminated above the furnace or did it just disappear into an attic area
Cathedral ceiling with no attic.
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  #14  
Old 10/4/12, 12:13 PM
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Default Re: Air Return question

I just got a call from a local HVAC guy that said he couldn't explain why it is the way it is but he could fix it by having the flex duct mounted above the door header with a new register instead of up through the roof.
That sounds like a plan.
What do you think Charley?
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  #15  
Old 10/4/12, 12:32 PM
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Default Re: Air Return question

Quote:
Originally Posted by jhorton1 View Post
Cathedral ceiling with no attic.
I understand that but where does the flex duct go when it leaves the furnace connection/flange



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