Here are the Old Models of Non-Standard Nutone Vacuum Inlets
If you have these types of inlets at home, you will need to replace them as compatible hoses and accessories are no longer available. These inlets used non-standard Nutone piping in the walls with a 1"7/8 diameter instead of the industry standard of 2" diameter. To convert your existing Nutone installation, you will need this conversion kit: Nutone Inlet Conversion Kit
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