(a) Protection from hazardous areas must be as required in NFPA 101, except as required or modified in this section. Gas-fired equipment must not be located in attic spaces, except under the following conditions:(1) the area around the units must be constructed to be one-hour fire rated;(2) the enclosure must have sprinkler protection; and(3) combustion and venting air must be ducted from the exterior in properly sized metal ducts.(b) Laboratories must be protected according to NFPA 99.(c) Cooking equipment must be protected according to NFPA 101.(d) Doors to hazardous areas must have closers and be kept closed unless provided with an approved hold-open device such as an alarm activated magnetic hold-open device, as permitted by NFPA 101. Doors must be single-swing type with positive latching hardware. View panels at laundry entrances must be provided and be of materials adequate to maintain the integrity of the door as allowed by NFPA 101.