Our doormats have external end caps on both sides of the walking direction in heights of 22 and 27 mm.
This is included in the overall dimensions. That means the actual size of the doormat in the walking direction is then approx. 2-3 mm shorter – but a minimum clearance is necessary so that dirt can fall in and because materials may expand in summer.
We additionally recommend a gap of 2-3 mm on all sides so that the doormat can easily be removed, as dirt sometimes needs to be swept out from underneath.