How to Measure Low Threshold Open In Doors:
Width:
Measure your aperture width in 3 separate places and then deduct 20mm off your smallest size. You must deduct 20mm on a low threshold due to a special
connection bracket. (Original Range of Doors Only). This will be your order size
Height:
Bottom Running ONLY Low Threshold option : OPEN IN DOORS
Low threshold doors by definition are designed to be buried in the floor to give a minimum
LEVEL upstand of 10mm. To achieve this, the threshold should be buried 55mm below your finished floor level. Therefore your order height is the distance from under your lintel to your finished floor level plus 55mm, less 10mm for fit.
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