In some areas

In some areas, the creation of a service opening in an HVAC system may require special licensure from the state or
locality. Most state construction industries are regulated by a licensing board or commission authorized by the state
government, and such organizations should be contacted directly for information about a particular state’s requirements.
This Standard includes a new chapter in the appendix titled Guidelines for Constructing Service Openings in HVAC
Systems. The information provided in this chapter is intended as a guideline to assist in the further understanding of
HVAC service system opening construction methods, but its contents are not considered requirements under this
Standard unless specified below.