This standard applies to decorative gas appliances for installation in solid-fuel burning fireplaces, which are constructed entirely of new, unused parts and materials: a. for use with natural gas, b. for use with propane, c. for use with natural and convertible for use with propane gas, d. for manufactured home (US only) or mobile home installation for use with natural and convertible for use with propane gas, and e. for manufactured home (US only) or mobile home installation for use with propane gas only.