FREE Technical information to assist you in your choice of greenhouse, Base sizes, Heights and other valuable data.
Your new Alton Evolution model will also include one or more louvre windows.
These work in tandem with your roof vents - as the automatic roof vents open and release the warm air, the greenhouse effectively sucks air in through the louvres.
These can be positioned near the bottom or the top and on most models at the side of the greenhouse or at the rear.
Supplied as manual opening as standard and you can add automatic optional louvre openers if you wish.