A naturally occurring hydrocarbon gas mixture used as fuel in a variety of applications, including home heating, water heating, and cooking.
The intentional infiltration of outdoor air into a space through open windows, doors, or other non-powered means.
A condition where the air pressure inside a home or space is less than the pressure outside due to more air being exhausted from the space than supplied to it. Under this condition, outdoor surrounding air will infiltrate through any openings into the space.
License Number: EVERGRL954R2