Patent ID: 8513839

Claim:
A ventilation fan with a housing, the housing having inlet and outlet openings and defining a passage extending there through, with a fan located in the housing, and with a motor operatively connected with the fan, the motor having a drive shaft that slides along its length between on and off positions, and comprising a damper, comprising a damper located in the passage, the damper being moveable between a closed position in which the passage is blocked and an open position in which the passage is not blocked, the damper further being operatively connected with the drive shaft such that the damper moves between its open and closed positions in correlation to the drive shaft being in its on and off positions, respectively, wherein a cooperating damper seat is provided in the housing and wherein the damper abuts the damper seat when the damper is in its closed position and the damper is spaced from the damper seat when the damper is in its open position.