It helped! There was a 1 inch gap at the bottom of the door! Easy to install although I had to shave it a bit to fit the width of the door and I had no trouble with the screws provided. Retains heat from the heater during operation. Cold air from the air conditioner in winter and summer. It was installed from the inside and fits so well that I don't have to use a roll of fabric to keep drafts out.
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