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Old 11-12-2017, 06:09 PM   #8
Mudchief
Montana Master
 
Join Date: Nov 2005
Location: Paola
Posts: 5,739
M.O.C. #4961
You are right about the big open space but if you close those vents then it has to draw the return air from the cracks in the belly of the unit which will cut down the flow to the furnace. Plus you are drawing in cold air rather then warmer air from inside the unit.
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Dennis & Linda Ward
Paola, Kansas
Montana 3735MK Legacy Edition
1200 watts of Solar
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