Grills........ Natural gas or propane, be sure to look at the IFC for code compliance.Here are a few sections - 308.1.4 Open-flame cooking devices.
Charcoal burners and other open-flame cooking devices shall not be operated on combustible balconies or within 10 feet (3048 mm) of combustible construction.
Exceptions: 1. One- and two-family dwellings. 2. Where buildings, balconies and decks are protected by an automatic sprinkler system. 3. LP-gas cooking devices having LP-gas container with a water capacity not greater than 21/2 pounds [nominal 1 pound (0.454 kg) LP-gas capacity].
308.3 Group A occupancies.
Open-flame devices shall not be used in a Group A occupancy.
Exceptions:
1. Open-flame devices are allowed to be used in the following situations, provided approved precautions are taken to prevent ignition of a combustible material or injury to occupants: 1.1. Where necessary for ceremonial or religious purposes in accordance with Section 308.1.7. 1.2. On stages and platforms as a necessary part of a performance in accordance with Section 308.3.2. 1.3. Where candles on tables are securely supported on substantial noncombustible bases and the candle flames are protected. 2. Heat-producing equipment complying with Chapter 6 and the International Mechanical Code. 3. Gas lights are allowed to be used provided adequate precautions satisfactory to the fire code official are taken to prevent ignition of combustible materials. If this is classifed as an assembly or is constructed of combustible materials.... you might have a bigger problem.