A rheostat is not recommended to be added to the fan. It would not be able to lower the CFM. The CFM can not be lowered on the explosion proof models. Adding a rheostat to the fan will damage the motor and void the manufacturer warranty.
Canarm Explosion-Proof Exhaust Fan, 10.in., 1/3 HP, 620 CFM, Model# SD10-XPF

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- Totally enclosed, ball bearing explosion-proof motor
- Aluminum louver shutters with long-life nylon bushings
- Thermal overload protection
- Rugged steel welded box with durable powder-coat finish
- Heavy wire chrome-plated OSHA guards on intake side of fan
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