Increase the air circulation in your Mythos, Hybrid, Americana or Essence model greenhouse with an additional air vent. Additional air vents will reduce humidity and improve air circulation to keep your greenhouse cooler on warm days. FEATURES Provides additional air ventilation Increases circulation when paired with the Side Louver Window Helps regulate temperatures Manual adjustment for variable airflow Works with all Silver Mythos and Hybrid greenhouses as well as Americana and Essence models Can be fitted with the Automatic Louver Window Opener for optimal airflow WARRANTY 1 Year Limited Warranty