| 摘要 |
<p>A curtain fire damper has a tell-tale to indicate whether or not the damper is open or closed. The damper 60 comprises: a housing 116 and a curtain 125 movable from a retracted state in which the housing has an opening 108 for fluid flow through the damper 60 to an extended state in which the opening is closed to block flow. A tell-tale 70 in the housing moves under action of the curtain to provide an indication visible from outside the housing through the port 88 (not shown) as to whether or not the curtain 125 is blocking the damper 60. The tell-tale 70 moves across the port 88 in the direction of the moving curtain 125 when the curtain closes to provide a visible indication that the curtain is blocking the damper.</p> |
