Measure your aperture width in 3 separate places and then deduct 10mm off your smallest size. This will be your order size.
Height:
Bottom Running option : OPEN IN DOORS
On open in doors the track system is on the inside. To determine your height measure from under your lintel to the top of the brick where the door will be fitted. Then deduct 10mm, subject to below.
If you require an external cill the distance from the bottom of the external door cill and your internal finished floor covering MUST be no greater than 81mm. (FIGURE A BELOW).
If NO CILL is required the distance from the bottom of the frame and your internal finished floor covering MUST be no greater than 51mm. (FIGURE B BELOW)
