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equipment and appliances' level service space. Such access shall ... [bulk of <br />section to read the same] ... on roofs having a slope greater than four units vertical <br />in 12 units horizontal (33 -percent slope). .. [Remainder of text unchanged]. <br />Amend Section 306.5.1, Sloped roofs, to read as follows: <br />306.5.1 Sloped roofs. Where appliances, equipment, fans or other components <br />that require service are installed on a roof having a slope of three units vertical in <br />12 units horizontal (25 -percent slope) or greater and having an edge more than <br />30 inches (762 mm) above grade at such edge, a catwalk at least 16 inches in width <br />with substantial cleats spaced not more than 16 inches apart shall be provided <br />from the roof access to a level platform at the appliance. The level platform shall <br />be provided on each side of the appliance to which access is required for service, <br />repair or maintenance. The platform shall be not less than 30 inches (762 mm) in <br />any dimension and shall be provided with guards. The guards shall extend not less <br />than 42 inches (1067 mm) above the platform, shall be constructed so as to <br />prevent the passage of a 21 -inch -diameter (533 mm) sphere and shall comply <br />with the loading requirements for guards specified in the International Building <br />Code. ...[Remainder of text unchanged beginning with "Access shall not require <br />walking ... 1 <br />Amend Section 501.3, Exhaust discharcre_by adding the following Exceptions: <br />501.3 Exhaust Discharge. [Existing text unchanged.] <br />Exceptions: <br />1. Whole -house ventilation -type attic fans shall be permitted to discharge <br />into the attic space of dwelling units having private attics. <br />2. Commercial cooking recirculating systems. <br />3. Where installed in accordance with the manufacturer's instructions <br />and where mechanical or natural ventilation is otherwise provided in <br />accordance with Chapter 4, listed and labeled domestic ductless range hoods <br />shall not be required to discharge to the outdoors. <br />4. Toilet room exhaust ducts may terminate in a warehouse or shop area <br />when infiltration of outside air is present. <br />55 <br />