NO trickle vents in double glazing

website trickle slot vent In my UPVC windows there is rain deflector grill cover on the outside and a cover with a shutter on the inside A slot about 10mm high is cut t slot milling Window Trickle Slot Vent 407mm White for uPVC Double Glazing & Timber Windows Reduces Condensation, Damp & Steam in Windows Fully Adjustable

trickle slot vent Window Trickle Slot Vent 263mm White for uPVC Double Glazing & Timber Windows Reduces Condensation, Damp & Steam in Windows Fully Adjustable : :  Aluminium SlotTrickle Vent 375mm provides ventilation with a modern, slim design It's durable, easy to install, and adjustable for any application   This RW Simon window ventilators ideal for both timber and PVC-u Trickle Slot Vent for uPVC Double Glazing WindowManufactured by RW

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