Main vent definition
Main vent means the principal artery of the venting system to which vent branches may be connected.
Main vent means the principal artery of the venting system to which vent branches can be connected. (Manufacturer's Floor Drain. See "industrial floor drain" as defined by this administrative regulation.)
Main vent means the principal artery of the venting system to which vent branches may be connected. “Offset” means a combination of pipe and/or fittings that brings one section of the pipe out of line but into a line