| 摘要 |
The invention is a fire damper (1, 101) comprising a tubular case (2, 102) inside which there is a revolvingly associated shutter blade (3, 103) suited to rotate around a rotation axis (X) between an open position, in which the shutter blade (3, 103) is arranged parallel to the longitudinal axis (Y) of the tubular case (2, 102), and a closed position, in which the shutter blade (3, 103) is arranged so that it is incident on the longitudinal axis (Y) of the tubular case (2, 102). The fire damper (1, 101) comprises at least one annular heatexpanding seal (4, 104) arranged around the tubular case (2, 102) in contact with the external surface (21, 121) of the same tubular case (2, 102). |
