UNDERFLOOR VENTILATION STRUCTURE

PROBLEM TO BE SOLVED: To provide an underfloor ventilation structure capable of widely securing the exhaust area for improving ventilation efficiency by forced ventilation, in underfloor ventilation by a foundation packing construction method. SOLUTION: A ventilator 1 is installed in an underfloor ventilating opening 93 formed in clearance between a foundation 90 and a sill 91. An air blowing fan 22 is installed in an intake port 21 in an air blowing casing 2 of the ventilator. A forward extension part 23 inserted into the underfloor ventilating opening is formed in a front part of the air blowing casing. An extension upper face plate 24, an extension lower face plate 25, a front exhaust port 26 and a side surface exhaust port 27 are formed in the forward extension part. A lateral width of the forward extension part is formed narrower than a lateral width of the underfloor ventilating opening, and exhaust clearance T is held between the side surface exhaust port and an inside surface 93a of the underfloor ventilating opening. A side extension plate extended outward in the width direction of the air lowing casing so as to block up the exhaust clearance, is installed in a side surface front end part of the air blowing casing. COPYRIGHT: (C)2006,JPO&NCIPI