Abstract: An air treatment system may create an air flow pattern in a vehicle interior space, using air discharges in multiple directions and louvers such that some vanes within a louver are not parallel to other vanes within the louver. An air treatment system may provide bulk air flow to the vehicle interior and directed airflow to a driver region. An air flow system may comprise, internally, a constriction bounded by an edge of a UV light shield and an edge of a filter housing. Such air treatment systems, using filtration and UV light, effectively remove or kill viruses and other pathogens, for use in buses and similar vehicles.

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.