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| Mark | Room | Type | Rough opening | Net clear (W × H) | Net clear area | Sill height |
|---|---|---|---|---|---|---|
| W1 | Hall | Fixed | 4'-0" × 3'-0" | — | — | 36 in |
| W2 | Bath 2 | Awning | 2'-0" × 1'-6" | — | — | 60 in |
| W4 | Bedroom 4 | Casement | 2'-8" × 4'-6" | 28 × 46 in | 8.9 sq ft | 36 in |
Every sleeping room needs one operable escape opening. Above the grade floor it must give at least 5.7 sq ft of net clear opening, at least 24 in high and 20 in wide, with a sill no higher than 44 in.
R310.1 Required. Basements, habitable attics and every sleeping room shall have at least one operable emergency escape and rescue opening, opening directly onto a public way or onto a yard or court that leads to one.
R310.2 Openings. Emergency escape and rescue openings shall meet the minimum dimensions in Sections R310.2.1 through R310.2.4.
R310.2.1 Minimum opening area. Emergency escape and rescue openings shall have a net clear opening of not less than 5.7 square feet (0.530 m²). The net clear opening shall be reached by normal operation of the opening from the inside. The net clear height shall be not less than 24 inches and the net clear width not less than 20 inches. Exception: grade-floor or below-grade openings may have a net clear opening of not less than 5 square feet.
R310.2.2 Window sill height. Where a window is provided as the emergency escape and rescue opening, its sill shall be not more than 44 inches above the floor.
R310.2.3 Window wells. The horizontal area of a window well shall be not less than 9 square feet, with a horizontal projection and width of not less than 36 inches.