Built-in mounting system; Dishwasher-safe stainless steel/aluminum filter or optional baffle filters; Variable-speed control; Heat sentry detects excessive heat and adjusts blower to high automatically; Choice of 10 HVI Certified blower options for internal or external mount (sold separately) (Rough-in kit required for external blowers #332KR); Optional wall remote control for quiet operation (sold separately); Design allows use with custom liners; External, interior and in-line blowers sold separately; 1 YR warranty