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    Trickle Vent - how to add a small fan to them

    hello, apologies if i am not clear - but i am learning my way around the DIY world. i have a small office where i keep a couple of PCs that run 24/7 in this office there is a UPVC (?) window that has a small rectangular Trickle vent. This Trickle Vent has a flap that we can open and...
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