The Nutone NF300DWH Door Speaker Retrofit frame has been discontinued. The M&S DMCFD Door Station Retrofit Mounting Frame White is an identical substitute.
The NuTone NF300DWH Door Speaker Retrofit Frame is to be used with an existing rough-in and retrofit intercom installations when replacing a non-NM series NuTone Door Station. This frame is designed to fit the NDB300BB, NDB300AB, NDB300WH, NDB300N Door Speakers.