Room heat circulation system

Claim 1

A room heat circulation system for circulating warm air from the top of a room to the bottom of the room using a wall of the room as a duct comprising, a fan and upper grill connected to a housing and said housing adapted to be inserted in an upper opening in said wall, said grill having upwardly directed louvers for drawing in warm air by the fan from the top of the room, said housing having a plurality of slots directed radially outwardly towards the edge of said upper opening when the housing is inserted therein, a plurality of L-shaped clips positioned on the back of the housing, each clip having a threaded bolt extending through one of the slots whereby the clips may be retracted in the slot for inserting the housing into the upper opening and may then be extended to engage the edge of the upper opening, a nut for attachment to the each threaded bolt for securing the housing in the upper opening, a bottom grill adapted to be inserted in a lower opening in the wall, said grill having downwardly directed louvers for exhausting warm air from the wall duct to the bottom of the room, a retainer bar positioned on the back of the bottom grill and pivotably connected thereby by a rotatable knob on the front of the grill whereby the bar may be rotated out of the way for inserting the bottom grill into the bottom opening and then rotated into engagement with the edge of the bottom opening for securing the bottom grill in the lower opening, clip guides on each side of each L-shaped clip for maintaining the clip in position for engaging the edge of the upper opening, and said clip guides are positioned on the back of the housing and extend radially outwardly for centering the housing in the upper opening.