| 摘要 |
PROBLEM TO BE SOLVED: To obtain a duct in which counter flow is prevented and a specified volume of air can be fed to each air conditioning space while preventing generation of a significant noise. SOLUTION: The duct comprises a main duct 1, branch ducts 2 disposed at an interval in the longitudinal direction thereof, and a flow regulation shutter 3 disposed in each branch duct 2 wherein the shutter 3 has a plurality of planar blades 3b arranged at an interval in the longitudinal direction of the main duct 1. The planar blade 3b projects partially into the main duct 1. Preferably, the projection is in the range of 10-20 mm. |
