From outside. Measure the width of the aperture in at least 3 different places top middle & bottom. Take the smallest measurement and deduct 10 mm to obtain the width of your door. Measure the Height of the aperture in at least 3 places left, middle & right, take the smallest measurement and deduct 10mm to obtain the height of your door.
The standard width of our frame is 50mm sometimes an add on / build up is needed to make the frame thick 20mm / 42mm. If you select trickle vents the bi fold will require a standard 20mm add on for the trickle vent to sit in and the sliding doors will require a 42mm add on for the tickle vents to sit in.
The standard width of our frame is 50mm sometimes an add on / build up is needed to make the frame thick 20mm / 42mm. If you select trickle vents the bi fold will require a standard 20mm add on for the trickle vent to sit in and the sliding doors will require a 42mm add on for the tickle vents to sit in.
Kit form is where the doors come separated from the frame. Usually the doors are delivered built up in the frame and not in kit form. Kit form is useful when these is limited access.
Trickle vents are required in certain situations when building regs are required
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