![]() Ventilation openings are not required where continuously operated mechanical ventilation is provided at a rate of 1.0 cubic foot per minute (cfm) for each 50 square feet (1.02 L/s for each 10 m 2) of crawl-space floor area and the ground surface is covered with an approved vapor retarder. ![]() The installation of operable louvers shall not be prohibited. ![]() The total area of ventilation openings is permitted to be reduced to 1/ 1,500 of the under-floor area where the ground surface is treated with an approved vapor retarder material and the required openings are placed so as to provide cross ventilation of the space.Where warranted by climatic conditions, ventilation openings to the outdoors are not required if ventilation openings to the interior are provided.The following are exceptions to Sections 1203.3.1: ![]()
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