Rectangular opening eggcrate return
Eggcrate air returns without rounded edges can be used for sidewall returns in between baseboards (as shown). Pricing for rectangular opening units is given by (overall width x overall height) x .64 + 35.
For units that have rounded edges and are not located between baseboard the formula is (duct length) x (duct width) x .64.
s&h: 10%, but at least $12.95