The AF64FN is a panel board front trim from the A Series, sized at 64-1/2" x 20", designed for flush mounting with an integrated nameplate. The NEMA 1 rating means it's intended for indoor use where protection against incidental contact and falling dirt is needed — standard for electrical rooms and light industrial enclosures.
Flush mounting means the trim sits level with the surrounding wall or panel surface — no protruding frame. This matters when the panel board is installed in a finished wall or where clearance is tight. The NEMA 1 enclosure confirms it's not rated for washdown, outdoor exposure, or hazardous locations; keep it inside a conditioned electrical room.