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[jerkash]

My main trunk line for my heating unit (gas pack) is 12x12.
Should I get a 12x12 heat exchanger or should I get a larger one and install it in my 12x12 line by reducing it by duct work on each side.
I could install a 18x18 and reduce it on each side back to a 12x12
I guess what i am asking is - Would the 12x12 restrict my air flow to much

Thanks

[juddspaintballs]

The real question is, how many BTU's was your ductwork and traditional heater designed to provide to your house?  If your heater is designed to provide your house with 80,000 BTU's, then you need a heat exchanger that can provide at least that many BTU's.  Then you size your ductwork to fit that size exchanger. 

[jerkash]

Thanks for the info - It's a big help.

[yoderheating]

I always go with the rule of thumb that a larger heat exchanger never hurt anyone and will save you more in the long run. If you go with a larger heat exchanger you get more btu's in a shorter period of time which allows the fan to run less. This saves some $$$ and it will add up over the life of your furnace.

[ffbare]

  I need an 18 x 18 for my duct work.

[Steinacher Sales]

ffbare,

18 X 18 is 120,000 btu a 180 degrees entering water temp.

Hope this helps

Greg Steinacher
618-401-0726
www.midwestoutdoorfurnace.com

[ffbare]

Yeah I Have been poking around and reading up on things  thanks for that 180 degrees note, I was wondering how it was rated with what temp.