As a former manager at Marvin Windows & Doors, I can tell you that the Marvin Patio doors are poorly designed and are notorious for leaking. True, they are not to be used in certain areas of the country, but the doors are poorly built. Having seen these manufactured on the lines I have seen sealant put in the wrong places numerous times, causing leaks and air to get through. Many times parts were left off, also leading to leaking problems. This is the case with many of their doors, but especially with the patio doors.
Handles were left off many units and glass put in backwards were also common issues. The quality leaves a lot to be desired.
Raider
Anytown
U.S.A.
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