300 series door closer is designed for interior commercial use. It is a grade 3 heavy-duty aluminum commercial door closer that complies with ANSI A156.4, UL/ULC listed up to 3 hour fire rated. This closer has a fixed spring tension, size 4. Grade 3 ANSI A 156.4 with 500,000 cycles, UL Listed Closer non-handed, cast aluminum, mounting to regular, top jamb or parallel arm applications Door preparation: 9-1/16 In. horizontal and 3/4 In. vertical mounting hole locations (retrofits traditional closer) door range: up to 180 degrees ANSI A 156.4, 300 series, grade 3, 500,000 cycles, UL Listed Door Type: Wood and metal Use Location: Interior/Exterior Commercial/Residential: Commercial