| 摘要 |
The device (10) comprises: a casing (12) in the shape of a cylindrical tube having in a first portion (12a) thereof, facing in the mounted condition towards the intake conduit (20) of a convector heater, a plurality of first openings (18) and in a second portion (12b) thereof, facing in the mounted condition towards the opposite side of the intake conduit (20), a plu- rality of second openings (22), the casing (12) being arranged to be mounted onto the ceil- ing (S) in such a manner that the first and second openings (18, 22) allow to put the inside of the casing (12) into communication with a first space (Al) beneath the ceiling (S) and with a second space (A2) above the ceiling (S), respectively; a closure member (14) in the shape of a cylindrical tube which is mounted within the casing (12) and is axially slidable relative to the latter between a first position, in which it leaves the first openings (18) open and closes the second openings (22), and a second position, in which it closes the first openings (18) and leaves the second openings (22) open; and actuation means (28, 30) for controlling the axial sliding movement of the closure member (14) relative to the casing (12) between the first and second position. |
