Heat Pumps and Electric Heating - return duct size

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chickenfarmer
01-24-09, 07:39 PM
I have a Trane Heat pump with a 20x10 return duct coming out of it when it goes up through the floor it changes into a drywall duct with an internal dimension of 25.25 x 18.5. Due to some renovations i need to reduce the size of this drywalled return. Can I reduce it to the size of the metal duct in the floor below? If not can i change the shape of the drywalled return to 48x10? If I reduce the size would i need to put additional returns in other rooms? Below is a sketch of the return.

thanks

<a href="http://s306.photobucket.com/albums/nn261/twinkletoesmomma/?action=view&current=HVACreturn-1.jpg" target="_blank"><img src="http://i306.photobucket.com/albums/nn261/twinkletoesmomma/HVACreturn-1.jpg" border="0" alt="Photobucket"></a>

airman.1994
01-24-09, 08:30 PM
10x20 is very small is this the only return? and what size unit do you have?
chickenfarmer
01-24-09, 08:42 PM
Yes, this is the only return.

I am not sure what size unit I have. It is a Trane Model # TWV730A140A0 , 1/3 Hp, 2.1 amp, 200 Volts....manufactured in 1989.

We've never noticed any problems with it...we just need some of that drywalled duct area for a remodeling project we are doing.

thanks