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Step 5Cut and attach molding.
If you are using purchased molding, now is the time to measure and cut it. We are only going to frame the inner opening with this molding, 52" X 29" in my case. So, three pieces 29" long and two pieces 50-1/2". The third 29" piece will create the hinge for the upper flap valve, set this piece aside for now.
Starting at the bottom of the upper vent, place one short piece of molding over the film so it lines up with the bottom frame of the vent and attach with screws, nails or staples. Then we do the same with the bottom, aligning it with the top of the bottom vent. Next, we measure and trim the longer side pieces so that they just fit between the two end pieces, and fasten.
We're almost done.
Starting at the bottom of the upper vent, place one short piece of molding over the film so it lines up with the bottom frame of the vent and attach with screws, nails or staples. Then we do the same with the bottom, aligning it with the top of the bottom vent. Next, we measure and trim the longer side pieces so that they just fit between the two end pieces, and fasten.
We're almost done.
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