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SECTION R310 EMERGENCY ESCAPE AND RESCUE OPENINGS R310.2 Window wells. The minimum horizontal area of the R310.1 Emergency escape and rescue required.Basements Window well shall be 9 square feet (0.9 mz), with a minimum and every sleeping room shall have at least one operable emer- " horizontal projection and width of 36 inches (914 mm). The gency escape and rescue opening. Such opening shall open az'ea of the window well shall allow the emer=ency escape and directly into a public street,public alley,yard or court.Where rescue opening to be fully opened. basements contain one or more sleeping rooms, emerQency Exception:The ladder or steps required by Secrion R310.2.1 egress and rescue openings shall be required in each sieepin� shall be pernutted to encroach a maximum of 6 inches (152 room,but shall not be required in adjoinin� areas of the base- mm)into the required dimensions of the window well. ment. Where emer�ency escape and rescue openinas are pro- R310.2.1 Ladder and steps.Window wells with a vertical vided they shall have a sill height of not more than 44 inches depth greater than 44 inches(1118 mm) shall be equipped (1118 mm) above the floor. Where a door opening having a �,ith a permanently affixed ladder or steps usable with the threshold helow the adjacent �round elevation serves as an �,indow in the fully open position.Ladders or steps required emergency escape and rescue openin� and is provided with a by this section shall not be required to comply with Sections bulkhead enclosure,the bulkhead enclosure shall comply with R311.5 and R311.6. Ladders or runcs shali have an inside Section R310.3.The net clear opening dimensions required by �,,,�dth of at least 12 inches(305 mm),shall project at least 3 this section shall be obtained by the normal operation of the inches(76 mm)from the wall and shall be spaced not more emergency escape and rescue openin� from the inside.Emer- �an 18 inches (457 mm) on center vertically for the full gency escape and rescue openings with a finished sill height height of the window well. below the adjacent ground elevation shall be provided with a window well in accordance with Section R3102. Emergency R310.3 Bulkhead enclosures. Bulkhead enclosures shal] pro- escape and rescue openings shall open directly into a public vide direct access to the basement.The bulkhead enclosure with way, or to a yard or court that opens to a public way. the door panels in the fully open position shall provide the mini- Exception: Basements used only to house mechanical mum net clear opening required by Section R310.1.1.Bulkhead equipment and not exceeding total floor area of 200 square enclosures shall also comply with Section R311.5.8.2. ' feet(18.58 mz). R310.4 Bars, grilles,covers and screens. Bars, grilles, cov- R310.1.1 Minimum opening area. All emergency escape ers, screens or similar devices are permitted to be placed over and rescue openinDs shall have a minimum net clear open- emergency escape and rescue openings,bulkhead enclosures, ing of 5.7 square feet(0.530 m2). or window welis that serve such openings, provided the mini- mum net clear opening size complies with Sections R310.1.1 Exception: Grade floor openings shall have a minimum to R3l 0.1.3,and such devices shall be releasable or removable net clear opening of 5 square feet(0.465 mz). from the inside without the use of a key, tool, special knowl- R310.1.2 Minimum opening height. The minimum net edge or force greater than that which is required for normal clear opening height shall be 24 inches (610 mm). operation of the escape and rescue opening. R310.1.3 Minimum opening width. The minimum net R310.5 Emergenc3� escape windows under decks and clear opening width shall be 20 inches (�08 mm). porches. Emergency escape windows are allowed to be installed under decks and porches provided the]ocation of the R310.1.4 Operational constraints.Emer�ency escape and deck allows the emerQency escape windov✓to be fully opened rescue openings shall be operational from the inside of the and provides a path not less than 36 inches (914 mm)in height room without the use of keys,tools or special knowledge. to a yard or court.