Care to elaborate? As I have no idea what you are talking about...
Blocking trickle vents stop air circulation and allows mould to grow. Being around mould is bad for your health.
Ah sorry, I didn't think my post had posted as the photo wouldn't upload. Thought you were referring to the paint comment! But the house is plenty drafty elsewhere - will it really make that much difference?!
@Sumo started
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Care to elaborate? As I have no idea what you are talking about...