Schaefer Manual Variable Speed Fan Controller

Dial-In Airflow Control for Single-Speed Greenhouse and Grow Room Fans

A single-speed fan runs at one fixed output with no way to throttle it down for a gentler circulation need, short of adding complex variable-frequency electronics. The Schaefer Manual Variable Speed Fan Controller solves that with a straightforward rotary dial, adjusting compatible 115/230V single-speed fans anywhere from 20% to 100% of their rated airflow.

A dedicated ON/OFF switch gives instant shutoff without disturbing the dial's speed setting, so restarting the fan later picks up right where it left off. The rugged watertight enclosure holds up to the humidity and dust typical of greenhouse and grow room environments, though it is not rated for direct water spray or submersion.

Key Features & Benefits

• 20% to 100% variable speed control — fine-tunes airflow to match ventilation and circulation needs precisely rather than running at one fixed output.
• Rotary dial interface — adjusts speed through a simple analog dial, with no digital menus or programming to work through.
• Dedicated ON/OFF switch — gives instant shutoff while preserving the dial's current speed setting for a quick restart later.
• 115/230V compatibility — works with both standard and high-voltage single-speed fan systems across a facility.
• Rugged watertight enclosure — resists the humidity and dust typical of greenhouse and grow room settings, though it is not rated for direct spray or submersion.

Who Should Use This

Greenhouse operators and commercial cultivators running Schaefer or compatible 115/230V single-speed circulation fans who want simple manual speed control without complex electronics, including HAF fan installations, are the right fit for this controller.

About Pinnacle Climate Technologies

Pinnacle Climate Technologies manufactures the Schaefer line of fans, blowers, and airflow accessories, including this controller, from its Sauk Rapids, Minnesota facility, following the 2015 merger that combined Schaefer Ventilation with Pinnacle Products International.

Frequently Asked Questions

How do I know if this controller will work with my fan brand?

It is designed for 115/230V single-speed fans generally, not limited to Schaefer's own fan line. Always verify your specific fan motor is rated for variable speed control before connecting it, since some single-speed motors can be damaged by a variable speed drive if not designed for that use.

Does turning the dial down significantly reduce airflow?

Yes, the dial covers a 20% to 100% range of the fan's rated speed, with 20% providing gentle circulation and higher settings progressively increasing both fan speed and airflow output. The full range gives meaningful control rather than just a subtle adjustment.

Can I control multiple fans with a single controller?

This controller is rated for single-fan use, so running multiple fans from one unit is not recommended without checking the total amperage draw against its rated capacity first. For most installations, one controller per fan is the standard setup.

Is the watertight enclosure rated for direct water spray?

No, the enclosure resists the ambient humidity and dust common in greenhouses but is not rated for direct water spray or submersion. Mount it in a location shielded from direct irrigation contact or condensation drip.