this motor features an open enclosure and is rated for indoor use within fan coil cabinets or air handlers only

Technicians must always disconnect or remove power from the E3Point base unit before removing the old cartridge and seating the new E3O2 sensor to prevent board damage

airtight seal to prevent air bypass

They are identical components

Lennox 27K66 Burner 321894-706 this motor features an openThe Lennox 27K66 Inshot Burner is an OEM replacement part engineered for high efficiency atmospheric combustion in residential and commercial furnaces. As a veteran grade furnace burner replacement, this component is designed specifically to withstand the thermal stress of high cycle heating demands. It effectively replaces legacy part numbers 27K6601, 65257000, and LX013, ensuring your system maintains its original factory specifications for flame