# Rack-and-Pinion Mechanism

> Glossary term · [DutchGreenhouses glossary](/glossary.md)

The rack-and-pinion mechanism is the gear drive that converts the rotation of a vent motor’s driveshaft into the precise opening and closing of roof vents via push-pull tubes running through the greenhouse.

## See also
https://en.wikipedia.org/wiki/Rack_and_pinion