Abstract: A heating, ventilation, and/or air conditioning (HVAC) assembly comprising an HVAC system having an air box with a wall having an inside, an outside and an opening, a collar extending through the opening in the wall, with the collar including a base flange and a cylindrical wall extending from the base flange, the cylindrical wall including a hook member, the base flange abutting the inside of the wall and the cylindrical wall extending through the opening in the wall, and a flexible hose having a corrugated cylindrical and flexible shell, corrugated cylindrical and flexible shell having an inside and an outside, the flexible hose being connected to the collar by inserting the cylindrical wall of the collar into the inside of the shell, with the hook member of the cylindrical wall of the collar extending into grooves on the inside of the shell.