MRCOOL DIY VersaPro 2nd Gen 3 Ton 16.2 SEER2 Central Ducted Heat Pump Split System - R454B Inverter - Multi-Positional Will this work for this Mr Cool unit?

Yes, the FB2128 can work with the MRCOOL DIY VersaPro 3-ton system as a return-air box, but it is not a direct-size match because the FB2128 is wider than the MRCOOL equipment, so a properly sized transition or adapter may be required.

If you have any further questions, please call us and we will be happy to assist you.