The MRCOOL MHK20B Signature Series Modular Blower Heat Strip with Circuit Breaker is a supplemental electric heating accessory designed to provide additional warmth for compatible modular blower systems. It works by converting electrical energy into heat through resistance elements, while the integrated circuit breaker provides electrical protection during operation. Designed for use ... https://www.partshnc.com/mrcoolr-signature-series-heat-kit-mhk20b