MKFP-CFKB-FAN KIT VFD-CFP FRAME C BOARD LEVEL 4.The MKFP-CFKB-FAN KIT VFD-CFP FRAME C BOARD LEVEL 4 is an innovative product that improves the efficiency of electrical devices. It includes a Variable Frequency Drive (VFD) for accurate motor control and the CFP FRAME C BOARD LEVEL 4 for easy integration.