I am considering using this method for air input. Stainless tubes with a bunch of small holes. People keep talking about turbulence that is used to create mixing of air and gases. Turbulence is not the only way to mix air and gases as seen on this video. I have never seen more dramatic flames than on this video. The stainless tube manifold will not last as long as the fire brick but they are quick and easy to replace when they wear out. Try not to stay in a box. After watching this video I am considering making a completely round burn tunnel out of fire brick instead of an arched top like a pizza oven.

http://www.youtube.com/watch?v=3YxrP_YHwJk&list=PL5698FC96568B4C76

http://www.youtube.com/watch?v=X0UsdWUzYEU

http://www.youtube.com/watch?v=U0w2ZmyrrqY