The Carrier CRLPELEV004A00 High Altitude Gas Conversion Kit is designed to adapt compatible Carrier gas-fired HVAC equipment for reliable operation at higher elevations. It includes components that adjust fuel delivery and combustion characteristics to accommodate reduced air density at altitude. Commonly used with compatible Carrier gas furnaces and heating systems, this kit helps ma... https://www.partshnc.com/crlpelev004a00-carrier-high-altitude-gas-conversion-kit