The AF25F is a flush-mount panel board front trim from the A Series, sized at 25-1/2" x 20". It carries a NEMA 1 enclosure rating, meaning it's intended for indoor use where protection from incidental contact with live parts and falling dirt is sufficient — no gasketed sealing against moisture or dust. The flush mounting style means the trim sits level with the finished wall surface, typical for commercial or light industrial panelboards installed in finished spaces.
The flush mounting dictates the rough-in: the trim requires a cutout sized to accept the 25-1/2" x 20" panel board body, with the trim flange overlapping the finished wall surface. NEMA 1 means no weatherproofing — the enclosure back box must be in a dry indoor location. The A Series family indicates compatibility with the manufacturer's A-series panel board interior and trim mounting hardware; verify the specific interior catalog number against the trim's knockout pattern before ordering.