Sigma 3 x 1.4 ft. Automatic Roof Vent brand_sunpack while the Easy Slide Cross

while the Easy Slide Cross Rail System locks the frame into place

and flowers

High PAR light transmission

The Barnstormer is the only fan on the market with an Exclusive Open Front Feature

Purlins: (1) run 5" rollform galvanized steel under peak

Sigma 3 x 1.4 ft. Automatic Roof Vent brand_sunpack while the Easy Slide CrossSupercharge your Sigma Greenhouse with the 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 shriveling or withering of your plants. Sigma Automatic Roof Vent Features: Made from galvanized steel and