Sigma Automatic Roof Vent recommendation This greenhouse was designed with

This greenhouse was designed with heavy-duty materials that promote 3 or 4 seasons of growing

one at each end

Protects against sudden changes in temperature

Price per sheet: $140

and dedicated growing zones

Sigma Automatic Roof Vent recommendation This greenhouse was designed withPlease note: this window only fits Sigma Greenhouse models. Supercharge your Sigma Greenhouse with the Planta Sigma Automatic Ventilation Window. Improve air circulation by bringing in the fresh outside breeze, keeping your plants healthy and disease free. The automatic ventilation window is heat activated, which requires no electrical power or programming. This function ensures that hot air escapes during the day, preventing shrivelling or withering