Blocking air vents for winter

[foxhole]

Not exactly, I added to it. Your suggestion of needing lots of ventilation is wasteful of heating energy, a proper planned ventilation system, combined with insulation, works much much and is much fuel efficient, than any random ventilation system in the hope of curing condensation and mold.

Not what I stated .

 

[ted456]

Fwiw:
what i meant in #23 was both of those pics show an adjustable plastic vent.
The face plate is like a Hit & Miss vent.

 

[IT Minion]

Not what I stated .

You objected to a statement that moisture generation needed to be limited. Harry didn't say it needed to be eliminated.

 

[Nige F]

Fwiw:
what i meant in #23 was both of those pics show an adjustable plastic vent.
The face plate is like a Hit & Miss vent.

I think we've all got it now - It's a hit and miss - Like a lot of your answers.