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The only thing is in my head the trickle vents are a continuous way for moisture to leave vs a proper drafty opening.
When there's enough wind pressure for trickle vents to provide a meaningful amount of ventilation, all the other leaky parts of the house are probably more than adequate.
Even when they are closed, trickle vents always leak some air when it's windy because they are flimsy crap.
They make windows noisier because you've cut a load of holes through it.Without taking the glass out and checking for screws holding a reinforcement in place, the only way to find out is drill a test hole.
Removing the sash from the frame is all well and good until one of the screw holes straps... or you drop the sash.
user69121
@hugo7
Cheers.
I'll also check out the catch things. The only thing is in my head the trickle vents are a continuous way for moisture to leave vs a proper drafty opening.