2 opener width
What is the width of your opener?
This helps us determine the size vent needed and quantity in each room
If your biggest opener is more that 700mm wide you only need 1 Trickle vent in that room to vent to document F Standard.
We advise that you fit the biggest you can in the window for optimum ventilation
700-895mm Over 900mm
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Please note this guide is intended to help you choose the correct vents for your property. If you are unsure please contact your local building control office to get more advice.