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#1
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New greenhouse
In article ,
kay wrote: Something that is often forgotten is that roof vents are ineffectual without floor vents - or at least enough leakage! I have seen people remove panes at the bottom for that reason. We have a south-facing conservatory and the roof vent area is 15% of the floor area, but we have five 20x20 cm floor vents, and it does NOT get to be like a blast furnace when we are out and the sun shines. Yes, it gets hot. I guess the reason I get by without floor vents is that I keep the doors open once the weather warms up. Floor vents aren't a lot of use if you've got the under-staging area crammed with pots, compost etc. You have to be around all of the time to do that. And it is not true that they don't work under those circumstances - air is a fluid - they don't work only if you actually block the flow. Regards, Nick Maclaren. |
#2
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#3
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New greenhouse
In article ,
kay wrote: I guess the reason I get by without floor vents is that I keep the doors open once the weather warms up. Floor vents aren't a lot of use if you've got the under-staging area crammed with pots, compost etc.- You have to be around all of the time to do that. Once I open the doors (in early June) they seem to stay open all by themselves ;-) The latest spring frost that I have had in Cambridge was the night of June 20th one year. People in colder parts of the country can have frosts at any time. And a lot of the more tender species can be seriously knocked back by even quite moderate cold snaps when young - which is why people grow them on in greenhouses. I had problems this year even in my fairly warm conservatory, because I had the vents open - nothing serious, but several of them lost a couple of weeks. Regards, Nick Maclaren. |
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