Yeah, its easy, make an fx_runner and give key "fxfile" and value "env/small_fire.efx" or "env/fire.efx". Small_fire is a small fire I use in torches and Fire is a larger fire that is good for larger things. Neither of these have sound. Also, "flame_jet" and "mini_flamejet" files which are also in env/ look cool but flame_jet has sound and mini doesn't. Here's the list of the fxfiles:
Note that if you want your map to work in lugormod well you must use / instead of \, even though both work in Base JKA.