Sigma Automatic Roof Vent

Sigma Automatic Roof Vent

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.
Regular price $95 USD
Regular price USD Save $-95 Sale Sale price $95 USD
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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 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.

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 11 reviews
Total 5 star reviews: 8 Total 4 star reviews: 1 Total 3 star reviews: 2 Total 2 star reviews: 0 Total 1 star reviews: 0
82%would recommend this product
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QualityRated 4.8 on a scale of 1 to 5
DurabilityRated 4.5 on a scale of 1 to 5
InstallationRated 3.6 on a scale of 1 to 5
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11 reviews
  • LD
    Linn D.
    Verified Buyer
    I recommend this product
    Location New Mexico
    Rated 5 out of 5 stars
    1 month ago
    The Automatic Roof Vents are Amazing!

    The technology of these automatic roof vents is amazing!! I installed the first one towards the end of a hot day and it was completely open. I was not optimistic that it was as "automatic" as Planta advertised, it seemed too simple. Next morning, I went out to see if the vent had remained open and was pleasantly surprised to see it had completely closed during the night when temps reached tge 50s! During the following day, the vent slowly opened as the day warmed up. Bravo, Planta!!!

    PG Profile picture for Planta Greenhouses
    Planta Greenhouses
    1 month ago

    Thank you for your wonderful review! So glad to hear that the Automatic Roof Vents are performing well and keeping your greenhouse comfortable. We appreciate your support!

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

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

    PG Profile picture for Planta Greenhouses
    Planta Greenhouses
    9 months 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
    10 months ago

    Glad we got the vents.

    PG Profile picture for Planta Greenhouses
    Planta Greenhouses
    10 months ago

    Great choice! Enjoy your greenhouse 🌬️🌱

  • YE
    Yolande E.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    11 months ago
    Great product

    They work great, adjust very well to the weather.

    PG Profile picture for Planta Greenhouses
    Planta Greenhouses
    10 months 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!

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


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Planta Greenhouses is dedicated to deliver your order promptly, so you can begin using your greenhouse products right away.

Because greenhouses are packaged in large boxes, they have unique shipping requirements, including: 

  • We will contact you to confirm shipping price, based on your location and order size.
  • Shipping on most orders is between $250 and $450. Deliveries to remote areas may cost 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.
  • We will make every effort to ship your order in the fastest possible manner, and by the mode of transportation that you specify; however, in the event of no specific instructions, we will use our judgment and ship the best, fastest and most economical way. We are not responsible for delayed delivery due to conditions beyond our control.
  • We do not ship to PO Boxes, as in most cases you will need to sign for your item. 
  • 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. 
  • Orders placed on weekends and public holidays will be processed the next business day.


FAQs Sigma automatic ventilation window

How big is the window?

The Sungrow Ventilation Window is exactly 3 ft wide by 1.4 ft tall (91.4 cm by 42.6 cm).

How many roof Ventilation windows are recommended for the greenhouse?

We strongly recommend installing an even amount of roof ventilation windows so that you can place at least one on each side of the greenhouse.

What greenhouse models can this window fit?

The Sigma Ventilation Windows will only be compatible with Sigma Greenhouse models.

What is the window made out of?

The roof ventilation windows are made of the same material as your Planta Greenhouse: shatter-resistant polycarbonate and strong, galvanized steel.