Division .7.1 For reasons of noise reduction, the Administration may approve, as an equivalent, doors with built-in ventilation sound-locks with openings at the bottom on one side of the door and at the top on the other side, on condition that the following provisions have been complied with:F1
United Kingdom
- .1
The upper opening shall always face towards the corridor and shall be provided with a grating of non-combustible material and an automatically operating fire damper, which is activated at a temperature of about 70 °C.
- .2
The lower opening shall be provided with a grating made of a non-combustible material.
- .3
The doors shall be tested in accordance with Resolution A.754(18).