When choosing a fire fit there a lot of decision to be made about what style of fire pit you want to add to your outdoor deck or patio. One popular choice is a natural gas fire pit. Natural gas fire pits come in every size from 20 inches to 90 inches. As you would imagine gas fire pits are available in round, square, rectangular, oval and linear shapes. Other options to consider are the color and what type of finish you want for your natural gas fire pit.