Hot recovery type fresh air unit

The utility model discloses a hot recovery type fresh air unit, including square tubular formula outer container, it has a plurality of rectangle frames that have certain thickness to discharge in the outer container, leaves the space between the adjacent rectangle frame, and post respectively rectangle frame confined aluminium foil paper the rectangle frame both sides, is equipped with a plurality of first through -holes on the frame at rectangle frame both ends, square tubular formula outer container both ends are equipped with the apron respectively, two apron internal surfaces are laminated with rectangle frame both ends surface respectively mutually, are equipped with a plurality of and the corresponding second through -hole of the through -hole location rectangle frame both ends and the corresponding third through -hole in the space position between a plurality of and adjacent rectangle frame on the apron. The utility model discloses a plurality of rectangle frames form the narrow flat inside passage of