Trickle Vents in uPVC Windows: Do You Need Them and Should They Stay Open?
Trickle vents in uPVC windows provide background ventilation while the window is closed. They are a deliberate air route, rather than an accidental gap in a seal. In a naturally ventilated home they will normally be kept open, including in winter, so fresh air can enter while moisture and stale air are removed through the
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