Questions regarding the English abbreviation of the PROII data report

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In PROII, create a floating valve distillation column. Part of the report contains data on the trays and dimensions of the distillation tower; in the table header DESIGN, there is a data item labeled FF. What does FF represent? Also, what does NP stand for? Please give some guidance. Thank you. TRAY VAPOR LIQUID VLOAD -- DESIGN -- NEXT SMALLER NEXT LARGER NP M3/S M3/S M3/S DIA, MM FF DIA, MM FF DIA, MM FF ---- ----- ------- ----- ------- ---- ------- ---- ------- ---- -- 2 0.288 0.00008 0.021 644.6 54.4 610. 60.9 762. 39.0 1 MECHANICAL RESTRICTION ON TRAY 2, FOR FF = 70.0, CALCD. DIA = 568.4 DIAMETER IS LESS THAN 1219.2 MM AND DC WIDTH IS LESS THAN 101.6 MM 3 0.288 0.00008 0.021 644.5 54.4 610. 60.9 762. 39.0 1 MECHANICAL RESTRICTION ON TRAY 3, FOR FF = 70.0, CALCD. DIA = 568.3 DIAMETER IS LESS THAN 1219.2 MM AND DC WIDTH IS LESS THAN 101.6 MM 4 0.288 0.00008 0.021 644.3 54.4 610. 60.8 762. 39.0 1 MECHANICAL RESTRICTION ON TRAY 4, FOR FF = 70.0, CALCD. DIA = 568.1