"Granity" wrote

About to buy a 10' x 8' metal greenhouse with double doors and 4 roof
vents.
Offered as an accessory is a louvre vent to put low down at the end
away from the door, is it worth spending the extra £40 on it or use the
money to buy other things?
And in the best style of gardeners question time what else should I but
:-)

I would say yes, the louvers allow an air circulation through the house
where hot air rises out of the top vents and cooler air is sucked in at the
bottom to replace it. With the last two summers you may think this a waste
of time/money but one hot summer and you will reap the benefit. Some might
say just leave the door open but that is not always a good policy as animals
get in and can damage plants or leave a deposit (experience of both!).

Automatic louver openers are available as well as the normal automatic top
vent openers and these are a must IMO, especially in this country when you
can get three seasons in one day.

--
Regards
Bob Hobden