| 摘要 |
PURPOSE:To prevent the increase of an installation space occasioned by connection of a duct and to reduce an installation space. CONSTITUTION:An exhaust gas suction port 2, a feed air discharge port 3, an exhaust gas discharge port 4, and a feed air suction port 5, all connected to a duct, are disposed laterally in one row in the upper surface of a body casing 1. This constitution facilitates a duct connection work, enables a duct to be connected within the projection plane of the body casing, eliminates a dead space, and reduces an installation space. |
