| 摘要 |
PURPOSE:To facilitate setting of various capacities, by a method wherein a plurality of a basic blow units, which are constituted such that a motor-driven sirocco fans are placed in a spiral case, are held in jaxtaposition with each other, and a direction of each spiral is arbitrarily set to a suction or an exhaust side. CONSTITUTION:A basic blow unit 100 is constituted such that a pair of spiral cases 107 and 108, which are capable of varying a blow direction simply by changing an assembling direction, are installed, and motor-driven sirocco fans 105 and 106 are housed in each case. A ventilation fan for a suction or an exhaust exclusive use is constituted by matching the direction of the two cases 107 and 108 with the direction of the cases 107 and 108 shown in a solid line or a dashed line. A plurality of units 100 are prepared and piled up as blow units 110 and 120 for a suction and an exhaust exclusive use, and this allows easy formation of ventilation fan having various capacities. A heat exchanger 202 is positioned so that it stretches over each suction and exhaust port of the ventilation fan. |
