The product is durovent 22 inch x 48 inch rafter vent, constructed from extruded polystyrene foam, net free air is 18.7 square inch, extra wide nailing flange 1.5 inch makes it easy to install, full 48 inch long, the minimum length needed to guarantee airflow through the insulation, the vent is pizza cut in the middle, making it easy to split 2 for 16 inch on center applications.. easy and simple use kit. The product is manufactured in china.
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