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If nothing but a doorway separates the work zone from living space, your safest best may be to install a ZipDoor Kit. This 4-mil plastic barrier fastens to the doorway with double-sided tape that's gentle on painted surfaces, says the manufacturer. Its two zippers are glued on - rather than stitched - for shear strength, and the product comes with two hooks for keeping the door flap open when necessary. The standard 3-by-7-foot barrier costs $30; a 4-by-8-foot fire-retardant commercial version goes for $40. ZipWall, 800/718-2255, zipwall.com.