Having spent a little time yesterday installing a set of louvres and some automatic opening stays in David's greenhouse roof vents, it was quite satisfying to see them wide open when we arrived home in temperatures soaring into the twenties, and even more so peer out of the window into the cool of the morning gloom to observe that they had indeed automatically closed, working exactly as advertised.
On our return to Waterloo later in the day I didn't see anyone else with the sort of interest I had in finding vents in the glass roof, nor for that matter could I see any open.
I suspect that's why the tomatoes don't grow all that well on the platforms.
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