CONCURRENT SUPPLY AND EXHAUST TYPE VENTILATION FAN

PROBLEM TO BE SOLVED: To provide a concurrent supply and exhaust type ventilation fan with hardly any air leakage which can be easily installed. SOLUTION: The concurrent supply and exhaust type ventilation fan is provided with a body 4 provided with an exhaust fan 2 and a supply fan 3 in an interior, and a duct connection part 27 having sleeves partitioned into an exhaust ventilation passage and a supply ventilation passage communicating with each of the exhaust fan 2 and the supply fan 3, provided on the body 4, and having a duct connection port 11 inserted inside and connected to a bilayer pipe 10 with a ventilation part divided by a center bulkhead 9. Since it is composed such that a heat insulating material 12 composing a heat insulating part is provided on an outer circumference of the duct connection part 27, and a stepped part is formed by the heat insulating part and the duct connection port 11, the concurrent supply and exhaust type ventilation fan with hardly any air leakage which can be easily installed can be provided. COPYRIGHT: (C)2006,JPO&NCIPI