Sigma Automatic Roof Vent 16mm fill the reservoir with water

fill the reservoir with water and fertilizer – and that’s it

UV resistant

Complete Kit: Comes with the motor

this fan is designed for consistent performance

including greenhouse

Sigma Automatic Roof Vent 16mm fill the reservoir with waterPlease note: this window only fits Sigma Greenhouse models. Supercharge your Sigma Greenhouse with the Planta Sigma Automatic Roof Vent. Improve air circulation by bringing in the fresh outside breeze, keeping your plants healthy and disease free. The automatic roof vent is heat activated, which requires no electrical power or programming. This function ensures that hot air escapes during the day, preventing shrivelling or withering of your plants.