Patent ID: 7332006

Claim:
A ventilating and air purifying device comprising: a case having a blower therein provided to a ceiling or a wall; a first flow passage extending through a lateral side of the case to connect an inside of the case and an outdoors, the first flow passage extending through a bottom side of the case to connect an inside of the case and a room, wherein the blower is configured to pass air from the outdoors to the room; a second flow passage extending through the bottom side of the case to connect the room to the inside of the case, the second flow passage extending through an adjacent side of the case, which extends transverse to the lateral side, to connect the inside of the case to the outdoors; and a damper in the case configured to either isolate the first flow passage from the second flow passage such that outdoor air entering the first flow passage is guided from the outdoors to the blower and room air entering the second flow passage is discharged to the outdoors, or to allow the first flow passage and the second flow passage to communicate such that the room air entering the second flow passage is guided to the blower, wherein the first flow passage crosses the second flow passage when the first and second flow passages are isolated from each other.