a combustion air supply blower includes a blower housing having a housing body and housing cover . the cover is removably attached to the housing body and generally provides access to a motor and fan assembly including a fan and a motor . the motor and fan assembly is removably mounted within the housing body and is captured between the housing body and the housing cover such that , upon removal of the housing cover , the motor and fan assembly is exposed and may then be lifted out of the housing body for easy maintenance , repair , and / or replacement of any portion of the motor and fan assembly . alternatively , upon removal of the housing cover , the motor and fan assembly may be accessed while remaining within the housing body to complete any maintenance and / or repair of the motor and fan assembly .