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Is it safe to block an air intake grill that seems to be causing a room to remain cold while the rest of the house is warm?
Wiki User
∙ 18y ago
partially, less than 50%, no problems, beyond that, you will get negative results elsewhere in the house that outweigh the benefits of doing so. You would have to know the following: cfm (cubic foot per minute) requirements of the system (for example, a 3 ton system requires 1200 cfm). Next you would have to calculate what the size the opening would be (another example, 1200 cfm requires an opening that is 16" x 12"). If you block off too much return air (or supply, for that matter) you can cause serious problems on the cooling side, and potentially unsafe conditions on the heating side.
Wiki User
∙ 18y ago
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