Return Duct: Can I Shorten Distance Between Filter and Funace Housing?


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Old 12-09-11, 11:04 AM
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Return Duct: Can I Shorten Distance Between Filter and Funace Housing?

I have a gas upflow furnace and the filter is currently 7" away from the furnace housing. I want to shorten this distance by 3" by cutting 3" from the duct where it attaches to the furnace and moving the entire return assembly 3" closer - will that cause any problems?

The blower case is about 4" inside the furnace housing.

In other words, is there some advantage to having a horizontal space of 7" between the filter and the furnace over a horizontal distance of 4"?

 
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Old 12-09-11, 11:54 AM
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No issues just a lot of work and money for three inches
 
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Old 12-09-11, 12:57 PM
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I agree with airman.


What you are proposing would presumably mean that the ductwork would no longer be square. It would tend to look like a hack job. It WOULD be a hack job you would be introducing to an installation that otherwise looks shipshape.

But it's your furnace.
 
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Old 12-09-11, 01:25 PM
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I'm guessing that you need to replace the water heater and either can't find or want one that's a bit larger in diameter?

Bet you could go to a HVAC shop and get them to make you a replacement duct for less than $100.

You'd prob need to take the old one to them...but thats not a big deal if you can do w/o heat for a day or so.

You'd need a slight angle on the mating surfaces.
 
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Old 12-09-11, 01:30 PM
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What you are proposing would presumably mean that the ductwork would no longer be square.
I'm not clear on what you mean by "square." What part would not be square?

And why would it be a hack job? Other than the "X" crease (don't know the proper term) not being centered, I should be able to make it look just like it is now, except the horizontal section will be shorter.
 
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Old 12-09-11, 01:47 PM
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Are you planning to move both ends of the vertical duct? If you're only moving the bottom, it won't be plumb any more.

I think Vic raised a good point - why do you want to do this? We might give you a better answer knowing that.
 
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Old 12-09-11, 02:24 PM
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If you don't move both ends you will need a transition because the duct will not fit it will be 2 short.
 
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Old 12-09-11, 02:25 PM
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Are you planning to move both ends of the vertical duct?
Absolutely. It would be incredibly cheesy not to.

why do you want to do this?
The furnace is in my shop in my basement. When I enclosed the shop many years ago, I installed a 36" door because I hate maneuvering projects and supplies through tight spaces. When the new furnace was installed a six years ago, the placement of the return duct required the storage cabinet to foul the doorway by 3" making my 36" doorway effectively 33".

Is it "only" 3"? Yes. Will it make my life easier and will it make me happy to have 3 more inches to move through? Yes.

It won't cost me anything and I bet I can do it in 90 minutes or less (and I'm slow).
 
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Old 12-09-11, 02:30 PM
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Now this all makes sense and I think you're on the right track.
 
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Old 12-09-11, 06:51 PM
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>


Heh, heh! See, we are in complete agreement!
 
 

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