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Openings for under-floor ventilation shall be not less than 11/2 square feet (0.135 m2) for each 25 linear feet (7620 linear mm) of exterior wall. They shall be covered with corrosion-resistant wire mesh with mesh openings not less than 1/4 inch (6.4 mm) nor more than 1/2 inch (13 mm) in any dimension.

Related Code Sections

1203.4.1.1 Interior Environment, [SPCB]
Openings for under-floor ventilation shall be not less than 11/2 square feet (0.135 m2) for each 25 linear feet (7620 linear mm) of exterior wall ...
1209.1.1 Interior Environment, [SPCB]
Accessible under-floor areas shall be provided with an 18-inch by 24-inch (457 mm by 610 mm) access crawl hole. Pipes, ducts and other nonstructural ...
1208.1.1 Interior Environment,
[SPCB] Accessible under-floor areas shall be provided with an 18-inch by 24-inch (457 mm by 610 mm) access crawl hole. Pipes, ducts and other ...