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The MacBone P150 air filter and cab pressurizer assembly bolts directly to either of the long sides of any MacBone rooftop unit. The assembly provides filtered outside air, under pressure, of up to 30 percent of system circulated air, providing filtration with a high level of cab pressurization. The MacBone “-6” models have all the bolt holes and plug-in wiring to accommodate the P150; the “-5” and earlier models require mounting holes to be drilled. The electrical requirement for the P150 blower is 12 or 24 volts DC at 6.5 amps. The filter element supplied with the P150 is a Donaldson Vacu/Safety Filter, Model G070017, and is available from MacBone or any Donaldson distributor.