Constructing a greenhouse

Hi to all the fernies,

I want to construct a new greenhouse.  But I need some help on this subject
as we build one but it did not work that well.  It was just a steel
construction covered with UV plastic and again with white 100% shade cloth.
It worked wonders in winter but came summer I almost lost all my ferns.  It
got to hot inside.  I left open the doors but it did not help much.  We took
it down.  Now we have a new corner that is part of the house it has three
brick walls so all I need to do is put in a fourth wall and a roof and voila
I would have a brand new greenhouse.  It would be 3mx3m and 2m high but I
need to know if I should put in an extractor fan to suck out the hot air.  I
have no idea if this is the right name for the fan I am talking about.

You see our summer temperatures are quite high it reaches about 38 degrees
Celsius so with a greenhouse having only one door it is difficult to get any
aircirculation as there are almost no wind and if there are any wind it is
scorching hot.

If someone knows anything please help me out or even just a website where I
might have a look.

Thanks a million
Doret

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