M2OF-18HFN1-M Condenser 2 zones, 18K Btu/H
M3OF-27HFN1-M Condenser 3 zones, 30K Btu/H
M4OF-36HFN1-M Condenser 4 zones, 36K Btu/H
M5OF-48HFN1-M Condenser 5 zones, 48K Btu/H