This kit contains the appropriate burner orifices, and pressure switch for the application of 90% single stage furnaces in high altitude installations. This kit is not applicable in Canada. Additional LP kits aren't required when using HASFK kits in high altitude installations using propane.

Please consult the furnace's spec sheet for compatibility. This kit is needed if the furnace is installed at altitudes that are higher than the base altitude range of the furnace. The base altitude range can be located in the installation instructions and on the furnace's product page in the SPECS section.