Sigma Automatic Roof Vent

Sigma Automatic Roof Vent

Rated 4.5 out of 5 stars
10 Reviews

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 September 2023.
Regular price $115 CAD
Regular price CAD Save $-115 Sale Sale price $115 CAD
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About Sigma Automatic Roof Vent

Please 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 of your plants.

The number of windows recommended depends on the size of the greenhouse, the environment you’re located, and the types of plants that you’re planning on growing. The following numbers, however, are good a starting point:

  • Sigma Urban (10x13): 2-4 windows
  • Sigma 20 (10x19.5): 4-6 windows
  • Sigma 26 (10x26): 6 windows
  • Sigma 32 (10x32): 6-8 windows

We recommend installing an even number of ventilation windows on either side of the greenhouse for optimum airflow.

Technical data:

  • Size: 3 ft wide by 1.4 ft tall (91.4 cm by 42.6 cm)
  • Maximum window opening: approximately 45cm (17 23/32 in) depending on adjustment and load
  • Start opening temperature: 17 °C-25°C (62,60°F-77°F)
  • Maximum opening temperature: 30 °C (86°F)


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    Rated 4.5 out of 5 stars
    Based on 10 reviews
    Total 5 star reviews: 7 Total 4 star reviews: 1 Total 3 star reviews: 2 Total 2 star reviews: 0 Total 1 star reviews: 0
    80%would recommend this product
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    10 reviews
    • YE
      Yolande E.
      Verified Buyer
      I recommend this product
      Rated 5 out of 5 stars
      1 month ago
      Great product

      They work great, adjust very well to the weather.

      PG Profile picture for Planta Greenhouses Canada
      Planta Greenhouses Canada
      1 month ago

      We're glad you're enjoying your roof vents and that they're working well for you. Your greenhouse looks amazing in those pictures!

    • JR
      Judi R.
      Verified Buyer
      I recommend this product
      Rated 5 out of 5 stars
      11 months ago
      planta greenhouse and auto windows

      loving the greenhouse and windows are awesome!

    • SD
      Sebelle D.
      Verified Buyer
      I recommend this product
      Location Mississippi
      Rated 4 out of 5 stars
      1 week ago

      Mine haven’t closed all summer due to our horrible hot weather!! Great to have.

      PG Profile picture for Planta Greenhouses Canada
      Planta Greenhouses Canada
      3 minutes ago

      It sounds like your vents have been working hard to keep things cool during the scorching summer! 😅🌬️ That's great to hear they've been a valuable addition to your greenhouse. Stay cool! 😊🏡

    • MH
      Mel H.
      Verified Buyer
      I recommend this product
      Location Alabama
      Rated 5 out of 5 stars
      1 week ago

      Glad we got the vents.

      PG Profile picture for Planta Greenhouses Canada
      Planta Greenhouses Canada
      1 week ago

      Great choice! Enjoy your greenhouse 🌬️🌱

    • JS
      James S.
      Verified Buyer
      I recommend this product
      Location Alaska
      Rated 5 out of 5 stars
      1 month ago


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    Greenhouses are amazing products, and they require special shipping and handling. That is the reason, we have been working diligently over the past year to secure preferential shipping rates for our customers. Most shipments across Canada and the US are between $250 and $450. 

    • We will contact you to confirm shipping price, based on your location and order size.
    • Shipping on most residential greenhouse orders is between $250 and $450, customers in remote areas may need to pay extra.
    • When you place your order, please make sure to enter the correct Phone and Address at checkout. You will be contacted by phone before the item is shipped. We cannot be responsible for deliveries to incorrect addresses.
    • As part of the delivery process, we require a contactable telephone number (for the courier company to contact you) before the item is shipped.
    • White glove delivery service isn't available. The greenhouse components are delivered in multiple boxes, the largest of which weighs 80lbs. The greenhouse will be delivered to your driveway. Please make arrangements to have the package moved to its installation location. 
    • We do not ship to PO Boxes, as in most cases you will need to sign for your item.  
    • Orders placed on weekends or public holidays will not begin processing until the next business day.