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Established 1975 A Trusted Brand
Made In Britain Homegrown Company
Safe & Secure Feel Confident as You Shop
Established 1975 A Trusted Brand
Made In Britain Homegrown Company
Safe & Secure Feel Confident as You Shop

Greenhouse Ventilation

Greenhouse Ventilation is achieved with a combination of roof vents, louvre vents, greenhouse doors and fans. Excellent greenhouse ventilation is essential for your crops to thrive. Greenhouse Ventilation controls both the temperature and humidity of the air in the greenhouse - both of which are essential factors when it comes to healthy plant growth and bumper crops. Basically, you need cool air to be drawn into the greenhouse and hot air to be driven out. This can be achieved by the installation of sufficient vents - such as louvre vents and roof vents - ideally fitted with automatic openers, together with the use of greenhouse fans. If you intend to grow in your greenhouse all year round then consider fitting an extractor fan in the greenhouse. Extractor fans are designed to completely replace the air in a greenhouse every few minutes even on the hottest days. Attached to a thermostat, the fan will run automatically. Remember, with greenhouse ventilation, it is always better to over-ventilate your greenhouse than under-ventilate it.
  • Bayliss XL Vent Opener

    Original price £24.99 - Original price £24.99
    Original price
    £24.99
    £24.99 - £24.99
    Current price £24.99

    For roof vents weighing up to 12lbs, approx.30" x 24" (76cm x 61cm). Can be clamped onto aluminium greenhouses - no need for any drilling. If a mor...

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    Original price £24.99 - Original price £24.99
    Original price
    £24.99
    £24.99 - £24.99
    Current price £24.99
  • Louvre Kit

    Original price £41.25 - Original price £41.25
    Original price
    £41.25
    £41.25 - £41.25
    Current price £41.25

    The kit is not of a fixed width, it will fit 90% of all greenhouses, the width of the kit is determined by the spacing of your glazing bars. The ki...

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    Original price £41.25 - Original price £41.25
    Original price
    £41.25
    £41.25 - £41.25
    Current price £41.25
  • Bayliss Automatic Louvre Opener

    Original price £24.99 - Original price £24.99
    Original price
    £24.99
    £24.99 - £24.99
    Current price £24.99

    Temperature adjustable - you can set the opener to start opening the louvre from 15-18*C, with a maximum opening at approximately 30*C. Easy Fitti...

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    Original price £24.99 - Original price £24.99
    Original price
    £24.99
    £24.99 - £24.99
    Current price £24.99
  • Replacement Power Cylinder for MK 7 Range

    Original price £19.99 - Original price £19.99
    Original price
    £19.99
    £19.99 - £19.99
    Current price £19.99

    Easy to fit. This cylinder is filled with a wax that expands in warm temperatures - it can be set to start opening from around 12*C / 55*F up to 75...

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    Original price £19.99 - Original price £19.99
    Original price
    £19.99
    £19.99 - £19.99
    Current price £19.99
  • Bayliss MK 7 Vent Opener

    Original price £39.99 - Original price £39.99
    Original price
    £39.99
    £39.99 - £39.99
    Current price £39.99

    Bayliss guarantee their openers for 2 years but if anything should go wrong after that replacement cylinders are readily available and easy to fit....

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    Original price £39.99 - Original price £39.99
    Original price
    £39.99
    £39.99 - £39.99
    Current price £39.99
  • Bayliss XL Vent Opener in Black

    Original price £25.99 - Original price £25.99
    Original price
    £25.99
    £25.99 - £25.99
    Current price £25.99

    This reliable vent opener works by a wax within the cylinder of the opener expanding when it's hot, pushing a piston to open the window. When it co...

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    Original price £25.99 - Original price £25.99
    Original price
    £25.99
    £25.99 - £25.99
    Current price £25.99
  • Replacement Cylinder For XL Vent Opener

    Original price £18.99 - Original price £18.99
    Original price
    £18.99
    £18.99 - £18.99
    Current price £18.99

    Dimensions: 8inch (20.5cm) long main body (including brass nut). For roof vents weighing up to 12lbs, approx. 30inch x 24inch (76cm x 61cm). Exert...

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    Original price £18.99 - Original price £18.99
    Original price
    £18.99
    £18.99 - £18.99
    Current price £18.99
  • 3kW Greenhouse Fan Heater

    Original price £76.99 - Original price £76.99
    Original price
    £76.99
    £76.99 - £76.99
    Current price £76.99

    Versatile - this heater has three setting, with options of fan only, 1.5kW and 3kw and is capable of heating a greenhouse up to 10' x 12'. IP24 Ra...

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    Original price £76.99 - Original price £76.99
    Original price
    £76.99
    £76.99 - £76.99
    Current price £76.99
  • Triple Spring Bayliss MK 7 Vent Opener

    Original price £41.99 - Original price £41.99
    Original price
    £41.99
    £41.99 - £41.99
    Current price £41.99

    For side windows up to approx.36" x 24" (92cm x 61cm). Bolts on to aluminium greenhouses (fixings supplied) - for wooden greenhouses it is attached...

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    Original price £41.99 - Original price £41.99
    Original price
    £41.99
    £41.99 - £41.99
    Current price £41.99
  • Automatic Roof Vent Opener for Palram Canopia

    Original price £61.00 - Original price £61.00
    Original price
    £61.00
    £61.00 - £61.00
    Current price £61.00

    Fully Automatic - Opens your roof vent as the temperature rises maximising ventilation and air circulation. Fully Adjustable - Has an adjustable ...

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    Original price £61.00 - Original price £61.00
    Original price
    £61.00
    £61.00 - £61.00
    Current price £61.00
    Sold out
  • Air Blower

    Original price £152.99 - Original price £152.99
    Original price
    £152.99
    £152.99 - £152.99
    Current price £152.99

    Moves a huge 420 cubic metres of air per hour. Only consumes 69 watts of power. Designed to be suspended using the two 11" (28cm) long zinc plated ...

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    Original price £152.99 - Original price £152.99
    Original price
    £152.99
    £152.99 - £152.99
    Current price £152.99
  • Auto Louvre Opener for Palram Canopia Greenhouse

    Original price £87.00 - Original price £87.00
    Original price
    £87.00
    £87.00 - £87.00
    Current price £87.00

    Easy to fit - Designed specifically to fit the Palram Canopia Louvre Window. Automated - Automatically opens the louvre window, it also has a rel...

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    Original price £87.00 - Original price £87.00
    Original price
    £87.00
    £87.00 - £87.00
    Current price £87.00
    Sold out
  • Super Bayliss MK 7 Vent Opener

    Original price £99.99 - Original price £99.99
    Original price
    £99.99
    £99.99 - £99.99
    Current price £99.99

    For large roof vents weighing up to 35lbs.  Bolts on to aluminium greenhouses (fixings supplied) - for wooden greenhouses it is attached by wood sc...

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    Original price £99.99 - Original price £99.99
    Original price
    £99.99
    £99.99 - £99.99
    Current price £99.99
  • Bayliss MK 7 Hydraulicheck Vent Opener

    Original price £65.99 - Original price £65.99
    Original price
    £65.99
    £65.99 - £65.99
    Current price £65.99

    For roof or side windows in severely exposed positions weighing up to 14lbs, approx.30" x 30" (76cm x 76cm).  Bolts on to aluminium greenhouses (fi...

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    Original price £65.99 - Original price £65.99
    Original price
    £65.99
    £65.99 - £65.99
    Current price £65.99
  • Replacement Cylinder for MK 7 Super Vent Opener

    Original price £43.99 - Original price £43.99
    Original price
    £43.99
    £43.99 - £43.99
    Current price £43.99

    Unique, ultra strong, finned aluminium cylinder with both internal and external finns - this gives a more efficient heat exchange between the wax i...

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    Original price £43.99 - Original price £43.99
    Original price
    £43.99
    £43.99 - £43.99
    Current price £43.99
  • Palram Canopia Louvre Window

    Original price £104.00 - Original price £104.00
    Original price
    £104.00
    £104.00 - £104.00
    Current price £104.00

    This louvre can be fitted into any side of the greenhouse, including the back of the greenhouse opposite the door. However, it can not be fitted in...

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    Original price £104.00 - Original price £104.00
    Original price
    £104.00
    £104.00 - £104.00
    Current price £104.00
    Sold out
  • Bayliss MK 7 Orchid House Vent Opener

    Original price £44.99 - Original price £44.99
    Original price
    £44.99
    £44.99 - £44.99
    Current price £44.99

    Designed for aluminium or timber framed vents measuring up to 60cm square (2ft square) lifting a load of up to 6kg (14lbs). Provides a maximum open...

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    Original price £44.99 - Original price £44.99
    Original price
    £44.99
    £44.99 - £44.99
    Current price £44.99
  • Cylinder & Washer to fit Orchid Opener

    Original price £21.45 - Original price £21.45
    Original price
    £21.45
    £21.45 - £21.45
    Current price £21.45

    Easy to fit. This cylinder is filled with a wax that expands in warm temperatures, it can be set to start opening from around 75*F up to 90*F. Le...

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    Original price £21.45 - Original price £21.45
    Original price
    £21.45
    £21.45 - £21.45
    Current price £21.45