| 摘要 |
An air damper having a frame, blade support strips on opposite sides, having blade pivot pins extending at spaced intervals, blade members extending from side to side and having pin receiving recesses at opposite ends for receiving pins on the support strips, a blade linkage member on at least one side, extending adjacent to the ends of the blades, guides on the frame, interengaging with the linkage member for sliding linear movement, and blade engaging members on the linkage member for respective blades, movement of the linkage member moving all the blades simultaneously.
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