
TBQ/TBS EVAPORATIVE COOLER INSTALLATION MANUAL
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7
PREPARING THE DROPPER
The 550 x 550mm / 21.7 x 21.7” dropper duct must have a raw
edge or safe edge at the top. Do not fold in a flange as this may
interfere with the transition and/or weatherdamper.
MOUNTING THE DROPPER
Install the dropper and securely fix it to the roof structure on 3
sides. This may require the addition of extra structural timber.
Important!
The dropper must never sit directly on any ceiling
joists or beams, as this may cause noise or vibration issues,
and possible ceiling damage.
Ensure the top of the dropper is level and square in all directions
(use a spirit level). This helps with levelling the cooler.
The installer must ensure the dropper is suitable, and is secured
adequately for wind conditions at the site. Additional restraints
may be required if the cooler is more than 200mm/8” higher
than the roof timbers, or design wind velocity at the site
exceeds 43m/s / 141fps.
In exposed or very high wind areas use 16 screws, minimum
shank diameter 5.2mm / 7/32” to secure the dropper. In areas
subject to windstorms/hurricanes or where the cooler is located
more than 8m/26’ above the ground seek advice from a
structural engineer.
The dropper may now be flashed to the roof. Make sure there is
no chance of water entering the roof space.
SECURING THE DROPPER & TRANSITION
Fit the transition onto the dropper as shown. Ensure that it
is oriented correctly, as shown by the engraved detail on the
transition.
Check the level of the transition on the dropper, with a spirit
level placed across the flats in both directions.
ILL969-B
Once level, begin securing the transition to the dropper using
the screws provided. There are eight ‘V’ notch locations for
screws.
Only use the screws provided. These must be used in the correct
positions to prevent interference with the weatherdamper. All
eight (8) screws must be used. Check the level periodically
before driving in all the screws.
Ensure the duct insulation is firmly held against the duct
connector flange on the dropper.
ILL967-B
ILL1683-A
ILL1049-B