Sigma Automatic Roof Vent 16mm this fan is designed for

this fan is designed for consistent performance

Actual Dimensions: 42" x 42" inlet size

UV resistant

Price per sheet: $80

Sigma Automatic Roof Vent 16mm this fan is designed forPlease 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.