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2000 Fire Door-Fan Manual updated 2002-05-28 Page 36 of 58
A ceiling tile is removed to allow the flex duct to
be mounted
Note how the flex-duct mounts in one half the tile
opening whilst the Retrotec blanking sheet that
comes with the flex duct fills the rest of the space
previously occupied by the ceiling tile.
In the corner is a 2x2 ft. grille leading to the ceiling
plenum. This grille should be sealed off to better
allow the ceiling to be neutralized.
The upper blower is measuring lower room leaks
whilst the lower blower neutralizes leaks above the
ceiling.
Both fans are running. The ceiling tile is lifted to
see which direction smoke travels to determine
ceiling neutralization. When the smoke does not
move the lower leaks can be measured.