Mechanical · IMC 2021 §306.4 / IRC 2021 §M1305.1.3
Underfloor Appliance Access and Passageway
Section: underfloor passageway 30 in high and 22 in wide, 20 ft max, with masonry lining 4 in above grade where deeper than 12 in below it; IRC variant and ground clearance noted.. Referenced to IMC 2021 §306.4 / IRC 2021 §M1305.1.3.
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