Combustion air obtained from under-floor areas, as illustrated in Figure M1703.2(4), shall have free opening areas to the outside equivalent to not less than twice the required combustion air opening.
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in Section 408 of this code. If combustionair for one or more heat-producing appliances is taken from within the under-floor spaces, ventilation shall ...
Combustion and dilution air shall be permitted to be obtained entirely from the indoors in buildings that are not of unusually tight construction. In ...