Passive vents are a good idea but, they don't work.
Better to solve the condensation problem.
Condensation is caused by people.
People put water vapour into the air of their homes.
They do it by breathing, sweating, washing, leaving doors open, drying things on radiators etc;
Not having extractor fans in kitchens and bathrooms or not using them or not using them long enough.
Possibly the worst thing is to turn the heating down or off at night or when going out.
Warm air holds much more water vapour the cold air, so when the temperature drops in front of the windows because you have drawn the curtains or closed the blinds, the trapped air gets cold and out comes the condensation, don't do it the window surface stays warm and no or very little condensation.
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