| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise to half or less as compared with that of the prior arts by eliminating the installation of a sound-arresting duct and making compact an entire part. SOLUTION: An air filter 5 and a heat exchanger 6 being provided at an air supply draft path 4 that is formed in a casing 1 so that a ventilation port 2 and an air supply port 3 being provided at the casing 1 can communicate each other are installed in an inclined posture so that they are nearly in inverse- V shape. Also, an air supply fan 8 is installed at a space S in nearly a triangular shape being formed at a lower part between the air filter 5 and the heat exchanger 6 being provided obliquely. |
