TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).o.PERSONNEL VENTILATION BLOWER.The personnel ventilation blower and lead filter fan consists of the personnel ventilation fan, lead filter fan, leadfilter fan, and accessory control box.The relationship of the personnel ventilation blower and relatedcomponents is shown in the diagram below.When the MASTER switch is turned ON, 24 vdc is supplied from the batteries through the MASTER relay tothe accessory control box. When the personnel ventilation blower switch is set to EXHAUST, voltage is appliedto energize the personnel ventilation blower in either a forward or reverse direction. When the MASTER switchis turned ON, 24 vdc is supplied from the batteries through the MASTER relay to the accessory control box.The lead filter fan operates when the ventilation blower switch is set to INTAKE.2-248
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