About Our Greenhouse Roof Vents
Ensure your plants thrive in every season with our comprehensive range of greenhouse roof vents and automatic openers. Proper ventilation is the single most effective way to prevent overheating and stop fungal diseases like Botrytis from destroying your crops. Whether you need a simple replacement arm or a fully automatic system, our collection is designed to maintain the perfect growing climate.
We stock everything from Automatic Vent Openers that require no electricity to Manual Window Stays for traditional operation. Our openers utilize temperature-sensitive wax cylinders that expand in the heat, automatically lifting the vent when temperatures rise and closing it as the evening cools. This means you never have to worry about rushing home to open the greenhouse on a sunny morning. Featuring rust-resistant aluminium construction and options for Halls Roof Vents (Frames), our products are built to last, backed by a 10 Year Warranty and Free UK Delivery.
Choosing Your Greenhouse Roof Vent
Selecting the right ventilation depends on whether you are automating an existing window or adding a completely new one.
🔄 Automating Existing Vents
If you already have a roof vent, an Automatic Vent Opener is the best upgrade you can make. Most of our openers, including the trusted Bayliss range, feature universal clamp-on fittings that attach easily to most aluminium greenhouses, including Halls Greenhouses and Elite Greenhouses.
➕ Adding New Vents
If you need more airflow, you can install an additional Replacement Greenhouse Roof Vent Frame. These replace a standard pane of glass in the roof. While this requires a bit more DIY skill than a clamp-on opener, it drastically improves air exchange.
🌬️ Wind Protection
For those in exposed UK gardens, look for "Triple Spring" openers which offer stronger resistance against wind flutter to prevent damage during gusts.
Prices start from just £25 for manual stays and standard auto-openers, rising to £85 for premium, heavy-duty powder-coated frames. Don't forget to pair your ventilation with Greenhouse Shading for the ultimate summer cooling setup.
Frequently Asked Questions about Greenhouse Roof Vents
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Do automatic vent openers work on all greenhouses?
Most automatic openers are designed to be universal. They clamp onto standard aluminium glazing bars found on Vitavia Greenhouses, Halls, and Elite models. However, if you have a wooden greenhouse, you may need to screw the bracket directly into the timber frame rather than using the clamp.
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How do I install a new roof vent frame?
Installing a new vent frame (not just the opener) involves removing a section of glass from your roof and slotting the new aluminium frame into the ridge bar. This is compatible with specific brands; for example, you must buy a Halls vent for a Halls greenhouse. See our Greenhouse Accessories for compatible glazing parts.
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Do I need to remove automatic openers in winter?
Yes, we recommend removing the wax cylinder (the black tube) from the opener during the coldest winter months. If the wax freezes while the vent is locked shut by ice/snow, the cylinder can burst. Store the cylinder in a frost-free shed until spring.
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What is the difference between a louvre and a roof vent?
Louvre Window Vents are installed in the side or rear walls of the greenhouse, drawing cool air in near the ground. Roof vents release the hot air at the top. Using both creates a "chimney effect" that rapidly cools the internal space.
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How much do greenhouse roof vents cost?
Basic manual stays and auto-openers start around £25. Complete additional roof vent kits (frame + glass) or heavy-duty openers range up to £85. Investing in good ventilation is often cheaper than replacing heat-damaged plants or buying Greenhouse Heaters to cure damp-related issues later.
💡 Expert Tip: How do I add accessories like staging or extra vents?
We make this simple. On each greenhouse product page, we list all compatible accessories—from Greenhouse Staging and shelving to extra vents and rainwater kits. You can select everything you need in one place, ensuring it's perfectly tailored to your chosen greenhouse model before you add it to your basket.
✅ Ready to improve your growing environment?
Browse our full collection below to find the perfect vent or opener. If you aren't sure which model fits your greenhouse, call our experts on 0800 098 8877 for advice.