Please Note that 2BH-machines with "K"-motors (the K is located in the 10th place of the MLFB) require an oversized conduit box for motor frames 63 - 90. This is to accomodate the thermal overload protection. The following models use the oversized conduit box: all 2BH12 all 2BH13 all 2BH14 2BH15 with 0, 1, 2, 3 and 6 on 11th place of MLFB 2BH16 with 0, 1 and 6 on 11th place of MLFB all 2BH72 all 2BH73 2BH74 with 1, 2, 3, 4 and 5 on 11th place of MLFB 2BH75 with 1, 2 and 4 on 11th place of MLFB 2BH76 with 1 and 3 on 11th place of MLFB The "K"-motor machines with a motor frame size 100 or larger used the Standard Terminal Box. The new blower models with "H"-motors use the Standard Terminal Box for all sizes.