The 530 × 325 mm of a GN 1/1 pan is its rim size under EN 631-1; on models with handles these can project beyond it. Fit in a container is worked out by comparing this size with the interior width and depth.
| Isotec TBX | Interior width × depth | GN 1/1 per shelf |
|---|---|---|
| 725 | 604 × 809 mm | 2 (325 × 2 = 650 mm depth) |
| 900 | 611 × 1025 mm | 3 (325 × 3 = 975 mm depth) |
The remaining margin goes to the handles, the shelf rails and keeping the pan from moving in transit. Deep pans (100-200 mm) hold more food but widen the shelf spacing, while shallow pans give more shelves.

