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Re: greenhouse ventilation

To M. L. van Rooijen
 In my opinion if you want the air to go out of the
top of your greenhouse you have got to let it in somewhere and with the
hot air tending to rise it will be most efficient if it comes in at the
bottom. But if you are using the level under the staging for any plants
you will have to diffuse the air flow , louvres are a must, but you may
need more than one vent below and hang some mesh or net curtain across
to prevent an icy blast. Remember if you get a cold but sunny day e.g.
in winter, temperatures could soar and then freezing air could rush over
the plants. The only other consideration that comes to mind is how the
glass panes fit together, it is a common technique with overlapping
panes for there to be a gap between them so that air filters in through
all these gaps over the whole greenhouse and not just in one place. I
would be inclined to fit as many options as I could afford, even if only
temporary, and then go through one season monitoring the temperature
fluctuations. An electric extractor fan higt up, with thermostat, is an
excellent investment and if powerful enough could bring air in through
the tiny gaps which must exist all over the place and will give you even
better control than even the best automatic vent openers. So much
depends on what you intend to put in the house, bicycles and lawnmowers
have been known to survive quite high temperatures but tend to
proliferate rather than propogate.


-- 
Allan Day  Hereford HR2 7AU allan@crwys.demon.co.uk
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