Jabsco 4" 250 CFM Flangemount Heavy Duty Blower - 12V. Then push that air through the ducting to a location where there's a higher concentration of air that needs to move. Using an inline fan blower this Jabsco 4" 250 CFM Flangemount Heavy Duty Blower pushes that air out towards the ducting which moves the hot air up and out of the boat expelling it out the exhaust. These Jabsco 4" 250 CFM Flangemount Heavy Duty Blowers have an outlet flange that mounts directly on a bulkhead and a slip on inlet ducting connection makes installation simple. These fans have a 5000 hour motor life which means they can be used for years in the engine room unlike light duty fans. The Jabsco Flangemount Heavy Duty Blower is built to provide the same high outputs as their standard specification counterparts but with greatly enhanced durability that can last years in service. Keep your boat's engine running smoothly with a Jabsco 4" 250 CFM Flangemount Heavy Duty Blower. Specifications for Jabsco 4" 250 CFM Flangemount Heavy Duty Blower: Manufacturer: Jabsco Color: Black Voltage: 12 volts Features of Jabsco 4" 250 CFM Flangemount Heavy Duty Blower Ducting: 4" Open Flow (CFM): 250 Volts: 12v Package Contents: Jabsco 4" 250 CFM Flangemount Heavy Duty Blower Jabsco 35760-0092: 4" 250 CFM Flangemount Heavy Duty Blower - 12V