Patent ID: 7591720

Claim:
A ventilating system comprising: a case locatable inside of a room, the case having a lower space, an upper space in fluid communication with the lower space, and a plurality of sidewalls, a first one of the sidewalls being locatable next to a first wall of the room, the first one of the sidewalls having: an inlet opening formed in a lateral-side surface of the lower space and connected to an air-supplying passage, the air-supplying passage having an air-supplying duct connected with the case under a ceiling after penetrating a wall and in communication with outside of the room for introducing an outdoor air into the room; and an outlet opening formed in the same lateral-side surface of the lower space and connected to an air-discharging passage, the air-discharging passage having a second inlet formed in a bottom surface of the lower space and an air-discharging duct connected with the case under the ceiling after penetrating the wall and in communication with outside of the room for discharging an indoor air to outside of the room; an air-circulating passage in the case for communicating the room with the air-supplying passage, to introduce the indoor air into the case, and to re-supply the introduced indoor air into the room, the air-circulating passage having a first inlet formed in the same bottom surface of the lower space and an air-discharging hole formed in a lateral-side surface of the upper space; an air-supplying fan located in the air-supplying duct for introducing the outdoor air into the room; an air-discharging fan located in the air-discharging duct for discharging the indoor air outside of the room; a preheat exchanger provided at an intersection between the air-supplying duct and the air-discharging duct for heat-exchanging between the outdoor air and the indoor air; and a fan vertically located over the first inlet in the air-circulating passage, the fan located in the upper space to axially draw in from the lower space the outdoor air introduced through the inlet opening from the air-supplying passage and/or the introduced indoor air through the first inlet from the air-circulating passage and radially blow out the drawn air through the air-discharging hole via the upper space, wherein the indoor air is introduced into the case from a bottom-side one of the sidewalls and re-supplied into the room from a lateral-side one of the sidewalls at an upper position thereof, and wherein the air-supplying fan, the air discharging fan and the preheat exchanger are located outside of the case and the room.