FOR YOUR SATISFACTION, THIS FIREPLACE HAS BEEN TEST-FIRED TO ASSURE ITS OPERATION AND QUALITY! Maximum input is 40,000 BTU/hr for natural gas and propane. When the fireplace is installed at elevations above 2,000ft, and in the absence of specific recommendations from the local authority having jurisdiction, the certified high altitude input rating shall be reduced at the rate of 4% for each additional 1,000ft. It is highly recommended to protect the logs from moisture (rain, snow). Cover the firebox when not in use. This fireplace is only for use with the type of gas indicated on the rating plate. This fireplace is not convertible for use with other gases, unless a certified kit is used. Minimum inlet gas supply pressure is 4.5“ water column for natural gas and 11“ water column for propane. Maximum inlet gas pressure is 7“ water column for natural gas and 13“ water column for propane. Manifold pressure under flow conditions is 3.5“ water column for natural gas and 10“ water column for propane.