Rough
Opening
W x L

Ceiling
Height

# of
Treads*

A**
Landing
Space

B
Projection

lbs.
per Unit

22 1/2" x 48"

8'5"

10

56"

60"

64

22 1/2" x 54"

8'9"

11

58"

66"

67

22 1/2" x 54"

10'

13

65"

79"

70

22 1/2" x 60"

9'3"

11

61"

69"

70

22 1/2" x 60"

10'6"

13

70"

80"

75

25 1/2" x 48"

8'5"

10

56"

60"

68

25 1/2" x 54"

8'9"

11

58"

66"

70

25 1/2" x 54"

10'

13

65"

79"

84

25 1/2" x 60"

9'3"

11

61"

72"

73

25 1/2" x 60"

10'6"

13

70"

80"

78

30" x 54"

8'9"

11

59"

66"

84

30" x 54"

10'

13

66"

79"

92

30" x 60"

8'9"

11

59"

66"

94

30" x 60"

9'3"

11

61"

69"

91

30" x 60"

10'

13

66"

79"

96

30" x 60"

10'6"

13

70"

69"

96