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Casement Windows - Vent Sizes (in mm)

Where are vents required?

Fire Egress Hinges

These are required on ALL side hung casement windows in ALL "Habitable Rooms"

Trickle Vents

These are required:

1. For ALL "New Build" properties, including proposed extensions to a dwelling
2. Where they already exist and the windows are being replaced "Like for Like"
3. Where for example a patio door or french doors are the only opening aperture in a room
4. When "Building Regulations" require some form of permanent ventilation in a room

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