... attempts to pass back through the port, it will lose sufficient heat for the temperature to drop below theignition temper ature of the gas. So the flame will not be able to travel through the hole ... burner distributes gas over a flat, horizontal, perforated surface through a very large number of very small ports. Air is passed up through theperforations and the air/gas mixtu re burns as a thin, ... must be very carefully desi gned. If theburner ports themselves are large, the flames may pass through them and burnon the gauze, causing overheating and possibly distorting the burner. If thegauze...