The MacBone P150-1 and P150V-1 cab pressurizers are designed keep excess amounts of dust, etc. from entering the operator's cab. They bolt either directly to the air conditioner, or to the operator's cab. All MacBone models have the bolt holes and plug-in wiring to accommodate the Cab Pressurizers. The electrical requirement for the Cab Pressurizer is 12 or 24 VDC at 6.5 amps. The filter element supplied with the Cab Pressurizer is a Solberg model. Call MacBone for replacement parts. *Note: MacBone Industries Ltd. does not claim any health benefits nor guarantee any particular safety level with the purchase of our Cab Pressurizers.