To calculate the value of the filters, see the following example:
Convert the starting unit of measure into meters
1 METRE = 10 dm = 100 cm = 1000 mm
Ex. No. 1): 200 x 490 mm filter = 0.2 x 0.49 m = tot. 0.098 m²
0.098 m² < to 0.10 m² : the code to be ordered is the following 31600105
Ex. No. 2): 200 x 725 mm filter = 0.2 x 0,725 m = tot. 0.145 m²
0.145 m² > to 0.10 m² : the code to be ordered is the following 31600110