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Established in 1994, the MacBone product line includes two air conditioner types; ROOFTOP models, and SIDE-MOUNT models, and various parts and accessories. Cab Pressurizers and filter kits are also offered. The cab pressurizer forces filtered air into the cab, maintaining a positive pressure to keep contaminants out. The rooftop and vertical MacBone air conditioning units have identical hydraulic specifications and the air duct cutouts and mounting setups are all interchangeable.