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How to determine return air duct size for a 50,000 BTU Gas Furnace

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How to determine return air duct size for a 50,000 BTU Gas Furnace kck3888 09-19-2006
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Posted by kck3888 on September 19, 2006, 4:52 pm
Hi, Folks,
I am trying to install the 50000 BTU Weather King gas furnace on my
rear house.
Before, there were only space heaters in that house, so I have to
"design" the ductworks and install the whole system.
I can never image that it is really complicated for me to finish this
project.
I have a few questions hope someone can help me.

How can I determine the size of the return air duct?
Where should I put the opening of the return air duct, do I have to
connect the ductwork to the furnace itself? Or can I just let the
return air duct connect to the furnace room (4'x4')?

Thanks


Posted by Bubba on September 19, 2006, 5:57 pm

>Hi, Folks,
>I am trying to install the 50000 BTU Weather King gas furnace on my
>rear house.
>Before, there were only space heaters in that house, so I have to
>"design" the ductworks and install the whole system.
>I can never image that it is really complicated for me to finish this
>project.
>I have a few questions hope someone can help me.

I doubt it but here we go
>
>How can I determine the size of the return air duct?

Put up 4 fingers, step back, click your heels and repeat: "Theres no
place like home." It should come to you by fairy messenger.

>Where should I put the opening of the return air duct, do I have to
>connect the ductwork to the furnace itself? Or can I just let the
>return air duct connect to the furnace room (4'x4')?
>
Normally, you just put it near the floor drain or real close to the
flue opening of your water heater.

>Thanks

You bet. Hope this helped.
Bubba
"Bubba Certified"

Posted by on September 19, 2006, 6:47 pm

kck3888 wrote:
> Hi, Folks,
> I am trying to install the 50000 BTU Weather King gas furnace on my
> rear house.
> Before, there were only space heaters in that house, so I have to
> "design" the ductworks and install the whole system.
> I can never image that it is really complicated for me to finish this
> project.
> I have a few questions hope someone can help me.
>
> How can I determine the size of the return air duct?
look at some similar sized installations

> Where should I put the opening of the return air duct, do I have to
> connect the ductwork to the furnace itself? Or can I just let the
> return air duct connect to the furnace room (4'x4')?
>
no, it will suck in the gases from the flue as well as the return air
duct, you have to connect it up to the furnace.

> Thanks


Posted by udarrell on September 19, 2006, 8:36 pm
kck3888 wrote:

>Hi, Folks,
>I am trying to install the 50000 BTU Weather King gas furnace on my
>rear house.
>Before, there were only space heaters in that house, so I have to
>"design" the ductworks and install the whole system.
>I can never image that it is really complicated for me to finish this
>project.
>I have a few questions hope someone can help me.
>
>How can I determine the size of the return air duct?
>Where should I put the opening of the return air duct, do I have to
>connect the ductwork to the furnace itself? Or can I just let the
>return air duct connect to the furnace room (4'x4')? Thanks
>
>
Installing ductwork systems is NO simple task! You will need an
experienced sheet metal duct system installer, or you will have a mess!

Here is a rough outline of what you are faced with!
http://www.udarrell.com/proper_cfm_btuh_duct_sizing_air_conditioning_systems.html

- udarrell

--
Air Conditioning's Affordable Path to the "Human Comfort Zone Goal"
http://www.udarrell.com/airconditioning_eer_ratings_over_seer_ratings_central_systems.html
(Solving ESP)
http://www.udarrell.com/udarrell-air-conditioning.html

Posted by zero on September 19, 2006, 11:56 pm

> Hi, Folks,
> I am trying to install the 50000 BTU Weather King gas furnace on my
> rear house.
> Before, there were only space heaters in that house, so I have to
> "design" the ductworks and install the whole system.
> I can never image that it is really complicated for me to finish this
> project.

<sniff,,,,,,,sniff,sniff,,,,sniff> hmmm, smells a little trollish.

> I have a few questions hope someone can help me.
>
> How can I determine the size of the return air duct?

Oh OK, the whole btu vs. filter size thing.......

> Where should I put the opening of the return air duct, do I have to
> connect the ductwork to the furnace itself? Or can I just let the
> return air duct connect to the furnace room (4'x4')?
>
> Thanks
>


-zero



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