How big of a hole for these returns??

Old 06-19-17, 01:18 PM
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How big of a hole for these returns??

As you can see from the picture below, three 12 x 8 holes were cut directly into the supply duct to fit the 12x8 grills.

I plan to place two return vents on the sides of the soffit but I am not sure how big of a hole I should cut in the return duct.

Would I be safe cutting Two 12x8 holes like the ones for the supply?
I realize typically the return holes are only 6" so would that throw off the circulation upstairs?

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