Increase the air circulation in your Rion Hobby Gardener 2, Grand Gardener 2 or Prestige 2 greenhouse with an additional air vent. Additional air vents will reduce humidity and improve air circulation to keep your greenhouse cooler on warm days. Provides additional air ventilation Increases circulation when paired with the Side Louver Window Helps regulate temperatures Manual adjustment for variable airflow Works with all Rion Hobby Gardener 2, Grand Gardener 2 or Prestige 2 greenhouse Can be fitted with the Rion Automatic Roof Vent Opener for optimal airflow