Add: "Clarification: An air handler unit may be not be located in a mechanical closet or room that only opens into the garage unless the following are met: 1) the mechanical closet that holds the AHU is fully isolated from the garage; 2) the mechanical closet is directly connected to the living space or outdoors; 3) the doors to the mechanical closet are sealed and gasketed; 4) the doors to the mechanical closet are either self-closing OR tied to a trigger that prevents the AHU from operating when the doors are open OR clear signage is posted to keep the doors closed at all times and the homeowner or building manager is trained on the importance of keeping garage air out of the mechanical closet; and 5) a 3rd party has verified (using a blower door test) that the mechanical closet has less than 2 Pa of connection to the garage when the house is depressurized to 50 Pa."