Sigma Automatic Roof Vent Planta Farmer Recommendation These innovative U-channels are designed

These innovative U-channels are designed to cap off the top and bottom of multiwall polycarbonate sheets

allowing your garden to flourish year-round

25mm 5 Wall Polycarbonate Panels

and hail easily slide off of the bell-shaped design

The amount of windows required depends on the greenhouse size

Sigma Automatic Roof Vent Planta Farmer Recommendation These innovative U-channels are designedPlease 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.