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or component and the top of the guard shall be located not less than 42 inches <br /> above the elevated surface adjacent to the guard. The guard shall be constructed <br /> so as to prevent the passage of a 21 inch diameter sphere and shall comply with the <br /> loading requirements for guards specified in the International Building Code. <br /> Exception: HVAC equipment located on a roof with the service side of the unit <br /> located 10 feet or more from the roof edge guards are not required, provided the <br /> distance from any side of unit is not less than 6 feet from the roof edge. <br /> Exception: Appliances, equipment, fans and other components located on a flat <br /> roof enclosed by parapet walls not less than 36 inches high, no guards required. <br /> /e� �fn i.r,..�.....,.�,.,,:,. a..,.4,, i.r,..�...,.,.�..,,:,, a_.,.4,. ,.L,.,, t,. ,.�_...,.�,.a <br /> l <br /> �di`�ir-r���a"�"s�rvrE�ss�a���e�itx�i�eee"raz�a�wi�,. T TT i o i r.:L..,...,, a..,.� <br /> Eeia�`t3@�i�-3�iA�-EEeiY�6i'ii�-�9 �iL c*�aii�rr"i-i�-'ivi-oii"s^�-vii�"s"sD�--�vii.siiu@iivii <br /> > > <br /> s�aees: M603.5. Nonmetallic ducts. Fibrous duct construction, specifically duct <br /> board material. shall not be used as Class 0 or Class 1 air duct. <br /> (fl �83-� M603.6. Flexible air ducts and fle�ble air connectors. <br /> Fle�ble air ducts, both metallic and nonmetallic, shall comply with Sections � <br /> 603.3� 603.6.1, `^�.T, 603.3� 603.6.3 and 6A3�4 603.6.4. Flexible air I <br /> connectors, both metallic and nonmetallic, shall comply with Sections cn� <br /> 603.6.2 through 693:3:� 603.6.4. Fle�ble air ducts and fle�ble air connectors , <br /> shall be used only in non-conditioned spaces or above suspended ceiling I� <br /> installations. � <br /> (g) "'"^�T M603.6.1.1 Duct length. Flexible air ducts shall be �� <br /> limited in length to 14 feet(4267 mm). ' <br />