The F designation of the 7.5 kW G120X is the alternative ordering twin of the P line: the same FSC frame, the same 28 A LO and 37.8 A max, the same unfiltered IP20 hardware - only the catalog channel differs.

What is the F alternative ordering variant?

F and P are two ordering designations for the same drive; nothing in the hardware, ratings or I/O changes between them. The F line exists so the same product is reachable through a second channel. Specifications written for the P drive apply to the F drive unchanged - the choice is made at the order desk, not on the engineering table.

What does unfiltered mean for the installation?

No integrated EMC filter - the U position in the order code. For pump stations with short motor cables and a metal cabinet this is often all that is needed, and filtered EMC categories C2 or C1 are reachable through accessories when the installation demands them. If the site EMC plan calls for a filtered drive, the EMC position in the order code offers that instead - the drive is specified accordingly at order time, not adapted afterwards.