I've been told that punching holes either along the bottom or all over sides of a burning barrel will make for a better burning barrel that will burn the trash more completely. I have always just put holes on the bottom of the 55 gal drum to let water drain out but have never put any on the sides. Does putting the holes in the sides of the barrel really help? I can see how it might increase airflow and make for a better burn. I've always wondered about installing a fan blowing into the bottom of the barrel to make sort of a high powered incinerator. Might be a fun project. Works for the little metal melting furnace I made.