AFA4000/E VAV Airflow Controller / p.47
4.3.8 Foot switch
The Foot Switch is an optional, third party supplied component, which can be positioned on the
floor in front of the fume hood and used to open the sash.
Figure 13: Typical third party foot switch
4.3.9 Sash drive unit
The Sash Drive Unit is a geared electric motor and clutch assembly used to drive the sash.
Three types of drive are available, none of which preclude manual opening / closing:
• Rack and pinion drive
• Chain and sprocket drive
• Pulley and wire drive
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