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.