Thank you mbga9pgf I have read the link.
While I understand you are correct, I still dont see how this is achievable in a naturaly ventilated modern house without opening a suitably large window in the winter. And who does that? My girlfriends Velux windows upstairs dont even have trickle vents.
They ought to be capable of providing background ventilation. In the case of roof windows this is usually achieved by pivoting the securing bar back halfway - this opens up a filtered vent without opening/unlatching the window.
They ought to be capable of providing background ventilation. In the case of roof windows this is usually achieved by pivoting the securing bar back halfway - this opens up a filtered vent without opening/unlatching the window.
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