you can see from this photo that the fan blows through the heat exchanger out the front and then down to the plenum under the furnace. (There is a cover on the front.) The cold air return is on the left side of the heat exchanger.
I will need to emulate this layout with the new furnace.
No portion of this page, text, images or code, may be copied, reproduced,
published or distributed in any medium without the expressed written permission
of the copyright holder.