6.2 Auto Sash motor drive unit
A Motor Drive Unit is used to automatically raise and lower the fume hood sash.
Three types of drives are available:
• Rack and pinion motor drive.
• Chain and sprocket motor drive.
• Wire and pulley motor drive.
The optimal choice of sash drive type depends on whether:
• The installation is part of a new build or retro-fit.
• The size and configuration of the fume hood.
• The fume hoods location.
None of these options preclude manual operation of the sash.
6.2.1 Rack and pinion motor drive
The Rack and Pinion Motor Drive uses a rack fitted directly onto the sash frame and a motor
drive assembly fitted to a framework above the fume hood.
This drive system is ideal for retro-fit installations where there is no access to the sash wires or
counterweights and / or where the sash is fitted to a metal framework, for example
combination type sash fume hoods.
6.2.1.1 Installing the rack and pinion drive
1. Raise the sash to the fully open position.
2. Offer up the motor assembly and rack to ensure that there is a clearance of at least 1.2 m
(47.24") above the top of the sash.
Note: The rack is supplied in 1m (39.37") lengths
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