Sigma Automatic Roof Vent 16mm These shutters are constructed with

These shutters are constructed with a heavy-duty extruded aluminum frame featuring precision-milled and strong welded corners for long-lasting durability

Actual Dimensions: 42" x 42" inlet size

5 lb / 2 kg Heat Source Electronic Dimensions (HxWxD) 11 x 8 x 12

Price per sheet: $80

Sigma Automatic Roof Vent 16mm These shutters are constructed withPlease 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.