The GE Spacemaker over-the-range microwave requires a 6" round duct for
proper venting over an "effective length" not to exceed 140ft.
I can't fit a 6 inch round duct; I can only use a 4" one because of
I have to run it up 2 feet elbow it 90 degrees and then out 10' to the
back of the house.
How less effective is a 4" round duct when a 6" duct is called in the
I can fit a 3 1/4" x 10" rectangualr duct most of the way, but I can
only use a 4 inch opening to the outside? How much are you losing if you
funnel a 3 1/4" x 10" rect. duct and funnel everything out through a 4"
round duct at the wall to the outside?
The microwave is capable of 315 CFM.
140 feet from a GE microwave......... I do not think so more like 14 feet.
Yes I pulled up the pdf spec sheet. Yep it says 140 feet, I can not imagine
that a 315 cfm fan could push air 140 feet.
If you ignore the instructions the exhaust function will diminish
My last house had one that vented up and then out the wall. Total length of
the run >3 feet, but there were 2 90's in the run. Outside you could feel
air, but it never really moved much air. I called it the noise maker,
instead of Space Maker.
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