These are department rules in addition to the requirements in IMC chapter 3:
Note: National Environmental Balancing Bureau (NEBB) Procedural Standards, the Associated Air Balance Council (AABC) National Standards, the Sheet Metal and Air Conditioning Contractors National Association, Inc. (SMACNA), or equivalent balancing procedures are acceptable to the department.
Wis. Admin. Code Department of Safety and Professional Services SPS 364.0313