Custom made egg crate style cold air returns
Very nicely made and gives the real vintage look to your home
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pricing:
step one: measure your duct opening
step two: multiply the length times the width
step three: multiply that figure by .66 and that will be your total before shipping. 
Minimum charge is $79.95

Note: There is a one inch lip all the way around. For example, a cold air return designed for a 10 by 10 duct opening would have overall dimensions of 12 by 12.