For low doormats
For low aluminium doormats (12-14mm) we use aluminium frames (for cavities) from aluminium angle bar sized: 20x15x2mm.
Depth of aperture, which should be prepared if we want to embed our frame is 15mm.
If we didn’t prepare aperture for doormat with a frame from aluminium angle bar in the floor earlier, we can put doormat directly on the floor using overrun frame dedicated for low doormats (look for “overrun frames”).