According to the Williams Furance Company Direct Vent Owners Manual, the orifice selection and change is required to "suit the gas supplied".
Furthermore, it is important that they strongly advise with a warning that "Danger of property damage, bodily injury or death. Make sure the furnace is equipped to operate on the type of gas available. Models designated as natural gas are to be used with natural gas only. Furnaces designated for use with liquefied petroleum gas (L.P.G.) have orifices sized for commercially pure propane gas. They cannot be used with butane or a mixture of butane and propane."
We encourage you to consult a local licensed and trained professional technician familiar with your application, local safety standards and codes mandated by teh Authority Having Jurisdiction, and the equipment prior to making any updates, purchases, and installations. This will ensure you are purchasing the correct component and having it installed by a licensed technician.
The following is extracted from the manual.
The P090544 Burner Orifice is for use at Sea Level, not at 8000 feet.
Replied on September 23, 2024 by Ori from Industrial Stores
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