Forced air (fan) or venturi?
Venturi burners work well but are difficult to design and manufacture. Blower type burners almost always work and are easy to build. Blower type burners are noisier than venturi or “atomospheric” burners, but they also provide more BTU in most cases. Safety is more of an an issue with blowers than with venturi. If the blower loses power or quits the gas will flare out of the forge and may reach several feet above the forge! This is one of several reasons you NEVER leave a gas forge running unattended. On my current forge the gas is controlled by a normally closed solenoid valve. If the forge loses power both the air and gas are turned off. This is combined with electric arc ignition so that everything is more or less automatic.
