Limited Time Sale - While Supplies Last

Sigma Automatic Ventilation Window

Approx Size: 3′ × 1.4′

Keep your plants cool and healthy during the hot and humid summer months with our Sigma automatic ventilation windows. The heat-activated opening feature allows you to easily maintain an ideal temperature inside your Sigma Greenhouse throughout the seasons.


  • Made from galvanized steel and polycarbonate for long-lasting durability.
  • Automatic, heat-activated opening, so your plants get fresh air when they need it most.
  • Rust-resistant and low maintenance year-round.
  • Simple design for fast and easy installation.
  • 3′ ft × 1.4′ ft size – exclusively designed for Sigma Greenhouse models.
Backorder now - will be available end of early fall.
Sale price
$95 USD
Regular price
Regular: $95 USD
Have questions? Call us 1-877-669-1286