AFA4000/E VAV Airflow Controller / p.69
3. The motor drive assembly should be fitted to a rigid framework and positioned centrally
above the sash. To ensure that the T-bar fixing clears the bottom of the motor assembly,
there should be at least 50 mm between the top of the sash and the bottom of the motor
drive assembly, when the sash is fully opened.
Figure 32: Rack and pinion sash drive motor assembly
Note: Ensure that the rack is long enough to protrude through the top of the motor
assembly, when the sash is fully closed.
4. When the motor drive assembly is fixed to the fume hood the T-bar should be fixed to the
rack and offered up with the sash frame.
5. Ensure that the rack is free to move over the full sash opening before marking up and fixing
the T-bar to the sash frame.
Note: The rack must to run vertically at 90º to the horizontal axis of the sash frame.
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