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How does the pull-down retractable screen door prevent bugs from entering?

April 26, 2017bugs entering pull-down retractable screen door

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How does the pull-down retractable screen door prevent bugs from entering?

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To prevent bugs from entering, the screen fits closely to each side of the door frame and in front of the door jamb (click here for drawing). The tension of the spring roller against the hold-down hooks keeps the roll-up screen door taut across the door opening. The tension is easily increased or decreased using a flat-head screwdriver on the side of the main housing.