Thresholds & Weatherstripping
than 1/4" (6.3 mm) vertical rise or with slope proportions no greater than 1:2 slope. Offset floor conditions greater than 1/2" (12.7 mm) require a 1:12 slope. Air Infiltration Products denoted by this symbol have been tested with air/smoke infiltration, all within the (0.500 cfm/ sq. ft. for double doors and .300 cfm for single doors)