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Ventilation (27)


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03155
Bayliss Replacement cylinder for XL Opener
£18.00
(8)
  • BLACK FRIDAY PRICE £15.30
  • Discount will be applied at checkout
05784
Bayliss Replacement cylinder for XL Opener (Black)
£18.00
  • BLACK FRIDAY PRICE £15.30
  • Discount will be applied at checkout
00051
Simplicity Classic auto opener for vent
£27.00
(36)
  • BLACK FRIDAY PRICE £22.95
  • Discount will be applied at checkout
Save 75%
00253
Alton Side louvre (4 slat)
£118.00 £30.00
Special offer save £88.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £25.50
  • Discount will be applied at checkout
00255
Simplicity Auto louvre opener
£32.00
(12)
  • BLACK FRIDAY PRICE £27.20
  • Discount will be applied at checkout
00094
Bayliss XL Opener
£33.00
(38)
  • BLACK FRIDAY PRICE £28.05
  • Discount will be applied at checkout
Save 22%
05494
Alton MK7 Triple spring Auto-vent
£49.99 £38.90
Special offer save £11.09
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £33.06
  • Discount will be applied at checkout
Save 20%
02907
Robinsons Auto roof vent opener XL
£54.00 £43.00
Special offer save £11.00
Offer ends on 15/11/2018
(3)
  • BLACK FRIDAY PRICE £36.55
  • Discount will be applied at checkout
Save 32%
02910
Bayliss Auto roof vent opener MK7
£65.00 £44.10
Special offer save £20.90
Offer ends on 15/11/2018
(1)
  • BLACK FRIDAY PRICE £37.48
  • Discount will be applied at checkout
Save 28%
04379
Alton Evolution louvre opener
£64.00 £46.00
Special offer save £18.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £39.10
  • Discount will be applied at checkout
00052
Simplicity Louvre plain aluminium
£48.00
(18)
  • BLACK FRIDAY PRICE £40.80
  • Discount will be applied at checkout
00246
Bayliss MK7 Auto opener for a vent
£48.00
(4)
  • BLACK FRIDAY PRICE £40.80
  • Discount will be applied at checkout
Save 30%
02186
Robinsons Auto 6 slat louvre opener D474
£69.00 £48.00
Special offer save £21.00
Offer ends on 15/11/2018
(2)
  • BLACK FRIDAY PRICE £40.80
  • Discount will be applied at checkout
Save 25%
02682
Alton Auto louvre opener for Alton Heritage
£72.00 £54.00
Special offer save £18.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £45.90
  • Discount will be applied at checkout
Save 25%
03115
Alton MK7 Auto roof vent opener
£76.00 £57.00
Special offer save £19.00
Offer ends on 15/11/2018
(4)
  • BLACK FRIDAY PRICE £48.45
  • Discount will be applied at checkout
Save 34%
05496
Bayliss Mk 7 Hydraulicheck Unit
£89.00 £59.00
Special offer save £30.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £50.15
  • Discount will be applied at checkout
00053
Simplicity Louvre green finish
£85.00
  • BLACK FRIDAY PRICE £72.25
  • Discount will be applied at checkout
07095
Simplicity Louvre Old Cottage Green
£85.00
  • BLACK FRIDAY PRICE £72.25
  • Discount will be applied at checkout
Save 29%
03285
Robinsons 6 Slat Louvre Plain Aluminium
£164.00 £116.00
Special offer save £48.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £98.60
  • Discount will be applied at checkout
Save 30%
02110
Robinsons 6 Slat Louvre White
£185.00 £130.00
Special offer save £55.00
Offer ends on 15/11/2018
Only 2 left!
  • BLACK FRIDAY PRICE £110.50
  • Discount will be applied at checkout
Save 30%
00401
Robinsons 6 Slat Louvre Green
£185.00 £130.00
Special offer save £55.00
Offer ends on 15/11/2018
Only 1 left!
(1)
  • BLACK FRIDAY PRICE £110.50
  • Discount will be applied at checkout
Save 30%
04730
Robinsons 6 Slat Louvre Ivory
£185.00 £130.00
Special offer save £55.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £110.50
  • Discount will be applied at checkout
Save 30%
05872
Robinsons 6 Slat Louvre Old Cottage Green
£185.00 £130.00
Special offer save £55.00
Offer ends on 15/11/2018
Only 2 left!
  • BLACK FRIDAY PRICE £110.50
  • Discount will be applied at checkout
Save 30%
06053
Robinsons 6 Slat Louvre Pastel Sage
£185.00 £130.00
Special offer save £55.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £110.50
  • Discount will be applied at checkout
Save 30%
06081
Robinsons 6 Slat Louvre Anthracite
£185.00 £130.00
Special offer save £55.00
Offer ends on 15/11/2018
Only 4 left!
  • BLACK FRIDAY PRICE £110.50
  • Discount will be applied at checkout
Save 25%
04250
Alton 6 Slat Louvre moss
£176.00 £132.00
Special offer save £44.00
Offer ends on 15/11/2018
  • BLACK FRIDAY PRICE £112.20
  • Discount will be applied at checkout

Ventilation

Ventilation is absolutely vital on a greenhouse. It¹s not just to keep the

greenhouse cool, although that is of course, important. It¹s also to

create a movement of air that helps to prevent powdery mildew and damping

off. The ideal ventilation in a greenhouse would have about twice as many

roof vents as side louvre vents. The roof vents will allow hot air out of

the top of the greenhouse, but if there are no louvres in the side of the

greenhouse these will not perform as well as they could in conjunction

with louvres. The cool fresh air would be sucked in through the louvres

and warm air would then rise easily through the roof vents. One of the

first items on your shopping list for a greenhouse must be automatic

openers for your roof vents. These superb inventions work by heat

expansion alone and will open your roof vents gradually as the greenhouse

warms up. That way you never have to remember to open your greenhouse

vents or close them again at night. All the different models of auto-vent

will lift the same weight of about 7 kg (ample for all our greenhouses)

but the stronger ones perform better in the wind.