The Zip Door is made from 4-mil plastic sheeting with a built-in zipper. It can be installed in less than a minute and is applied to the wall opening with two-sided tape. The side that goes against the wall adheres gently to the wall surface like traditional painter’s tape; the side that sticks to the plastic makes a stronger bond but can be repositioned for up to an hour before it’s fully set. In cases where lead paint is present, the door meets the EPA’s RRP requirement for a covered doorway, says the maker. A 3-foot by 7-foot door costs about $30, and a 4-foot by 8-foot door about $35.

ZipWall, 781/648-8808,

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