B-Line Eaton series strut fiberglass channel and fittings, 3.25" channel height, 240" channel length, 1.62" channel width, Vinyl polyester resin

That is the reason to pick it. The BFV22A-240 channel is molded from vinyl polyester resin rather than steel, so there is nothing in the section to rust. Wastewater plants, chemical rooms, pool equipment areas, coastal and washdown spaces are the usual places it replaces galvanized or stainless strut. It is also non-conductive, which matters when the strut is running near energized equipment.

Yes. The BFV22A-240 is the bare 240 inch channel section only. Channel nuts, brackets, post bases, clamps and threaded rod are all separate line items, and in a corrosive application you want fittings and hardware in a matching corrosion-resistant material rather than plain steel, otherwise the fasteners fail before the strut does.

Pick the 3.25 inch deep section when the span between supports is long or the load is heavy, such as trapeze hangers carrying multiple conduits or cable tray. The extra depth is what buys you the stiffness. For short wall-mounted runs, light single-conduit support or anywhere headroom is tight, a shallower fiberglass profile is easier to work with and takes up less space. Width is the same 1.62 inches either way, so channel nuts sized for standard 1-5/8 inch strut still land in the slot.

Yes, the 240 inch stick is meant to be cut down on site. Cut fiberglass with an abrasive or carbide blade, wear respiratory and eye protection because the resin and glass dust is an irritant, and seal the cut end per the manufacturer's instructions to keep moisture out of the exposed glass. Unlike galvanized steel, you are not dealing with a cut edge that has to be cold galvanized.

The BFV22A-240 fiberglass channel is a structural support section, and it is supplied as a non-certified item, so specify it on structural and corrosion-resistance grounds rather than as a listed electrical component. Any listing requirement on your drawing needs to be satisfied by the raceway, fittings or equipment it supports.