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Re: greenhouse ventilation

Hi
I think You should trust the man who delivered. The greenhouse walls are put
together so that they give good ventilation into the greenhouse, You shuld
take care of how to get heat out. (And remember that during winter the
greenhouse outlet often opens during the sunny days, but the air outside (that
will go into the greenhouse) can be very cold).
Sven in Sweden

duncan wrote:

>   ------------------------------------------------------------------------
>
> Subject: genetics question & greenhouse ventilation
> Date: Sun, 28 Jun 1998 13:56:04 -0700
> From: "M.L. van Rooijen" <lynnvr@wxs.nl>
> To: "seeds-list@eskimo.com" <seeds-list@eskimo.com>
>
> In the part of my garden used for cut flowers, I am growing two
> varieties of Centaurea cyanus which I started from store-bought seed:
> "black boy" and the regular blue kind, about 1 1/2 meters away from each
>
> other.  My question is: do these cross-pollinate, and what are the
> chances that seed collected from the black boy plants will produce dark
> purple flowers next year?  (The package says nothing about hybrid,
> etc.).  What about other Black Boy plants that are about 10 meters away
> in another area?
>
> Second, a bit off-subject--excuses for this, but don't know of a more
> appropriate list--I am looking for some advice about greenhouse
> ventilation.  This spring, partly as an esthetic compromise, I became
> the owner of a Hall's (U.K.) hexagonal greenhouse  with a pointed
> cone-shaped roof (2.5 meter diameter, walls 2 m high, to roof-point 3
> m.).  It came with a louver window at ground level, and the announcement
>
> that the cone roof provided excellent ventilation, although it doesn't
> open, and has only a very small opening.  In anticipation of warm days
> (which hardly every come here in Holland, but you never know!), I
> ordered a second louver window which arrived yesterday.
> Now the question:
> According to the man who delivered the window, both windows should be
> high (the pane that goes from 120 cm to 180 cm above the ground) to let
> the hot rising air out.  On the paper from Halls, stands the instruction
>
> (with no explanation as to why) to install the window in the bottom pane
>
> fom 0 - 60 cm above the ground (assuming one window).  My idea was to
> place one low, and the other high and on the other side, in the hope
> that cold air would be sucked in under and rise and go out above,
> creating mre circulation.  The man from the garden center sticks by his
> advice of two high.  Which choice do you think will give the beter
> ventilation?  I do realise that on 'normal' rectangular greenhouses, the
>
> windows are high--but also placed in the slanting roof, which I cannot
> open.
> Any advice is appreciated!
>
> Lynn van Rooijen
> Netherlands
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