The AIR-3 CO2 & Atmosphere Controller allows you to control the temperature and humidity like the AIR-1, but adds a photo cell to allow CO2 to be added when you are in an on light cycle. Plus it will turn off the CO2 outlet whenever the exhaust fans are on to prevent CO2 from being wasted when the fans are exhausting your growing area. An  oscillating fan is recommended to keep the air flowing around your plant and the AIR-3 sensors. It is rated for 15 amps @ 120 volts and has a 3 foot temperature sensor.

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