Vehicle firewall with a heater pipe seal

A mounting arrangement for accepting a pipe through a boundary in a vehicle includes a dash or firewall (14) defining a boundary between an engine compartment and a passenger compartment. A dash mat (70) is disposed adjacent to the dash. A pipe (30) extends through the dash between the engine compartment and the passenger compartment. A first mounting plate (24) is positioned in the passenger compartment and accepts the pipe through a passage (56) therein. A noise abating material (42) is disposed between the dash and the mounting plate. The noise abating material contacts an outer circumferential surface of the pipe (108) and overlaps a portion (74) of the dash mat in an assembled position.