Embedded ventilation fan

Abstract

An embedded ventilation fan includes a housing, a decorative panel, an air supply blower, an air exhaust blower, and a heat exchange element. The heat exchange element is disposed at a position where an air supply passage and an air exhaust passage cross each other in the housing. The decorative panel includes a front surface, a rear surface, an air supply slit opening, an air exhaust slit opening, and a non-open zone. The rear surface includes a protruding wall protruding toward an inner side of the housing. The non-open zone is a zone having no opening. The air exhaust slit opening is partitioned from the non-open zone by the protruding wall on the rear surface. The heat exchange element is disposed directly above the non-open zone and is not disposed directly above the air supply slit opening and the air exhaust slit opening.

What is claimed is: 
     
         1 . An embedded ventilation fan comprising:
 a housing;   a decorative panel;   an air supply blower;   an air exhaust blower; and   a heat exchange element,   wherein the housing includes a side surface, an upper surface, and a lower surface,   the decorative panel is disposed on the lower surface,   an air supply passage through which air is blown from an outside of a room into the room by the air supply blower is formed,   an air exhaust passage through which air is blown from the room to the outside of the room by the air exhaust blower is formed,   the heat exchange element is disposed at a position where the air supply passage and the air exhaust passage cross each other in the housing,   the decorative panel includes
 a front surface, 
 a rear surface, 
 an air supply slit opening, 
 an air exhaust slit opening, and 
 a non-open zone, 
   the front surface is a surface opposite to the rear surface,   the rear surface includes a protruding wall protruding toward an inner side of the housing,   the air supply slit opening is connected to the air supply passage,   the air exhaust slit opening is connected to the air exhaust passage,   the non-open zone is a zone having no opening,   the air exhaust slit opening is partitioned from the non-open zone by the protruding wall on the rear surface, and   the heat exchange element is disposed directly above the non-open zone, and is not disposed directly above the air supply slit opening and the air exhaust slit opening.   
     
     
         2 . The embedded ventilation fan according to  claim 1 , wherein,
 when a region of the non-open zone directly below the heat exchange element is a directly lower region, the protruding wall is disposed to surround the directly lower region, and   the directly lower region is present in the non-open zone.   
     
     
         3 . The embedded ventilation fan according to  claim 1 , wherein the protruding wall is a continuous wall without a gap. 
     
     
         4 . The embedded ventilation fan according to  claim 1 , wherein
 the housing includes an inner lid opening on the lower surface,   an inner lid is disposed to cover the inner lid opening,   the inner lid is positioned between the housing and the decorative panel,   the inner lid includes an air supply blow-out port and an air exhaust suction port,   the air supply blow-out port is connected to the air supply passage,   the air exhaust suction port is connected to the air exhaust passage, and   the heat exchange element is disposed directly above the air exhaust suction port.   
     
     
         5 . The embedded ventilation fan according to  claim 4 , wherein an opening area of the air exhaust suction port is smaller than an area of the non-open zone. 
     
     
         6 . The embedded ventilation fan according to  claim 4 , further comprising an air exhaust filter between the heat exchange element and the decorative panel, wherein the air exhaust filter is disposed to cover the air exhaust suction port. 
     
     
         7 . The embedded ventilation fan according to  claim 1 , wherein the rear surface is a warpage suppressing rib that suppresses warpage of the decorative panel in the non-open zone.