B= indoor air handler
2 design series
B motor speed
M (Configuration)Multipoise
048 size.... 4 ton
K electrical code 208-230
B Cabinet size.... 19 3/4 width
Frigidaire is made by Nordyne
yea they work ok..... depends on year but should have 8 year warranty on parts, Seem to be quiet in attic but outside units could be a lot quieter in my opinion.