Each of these locations

Each of these locations may require one or more service openings to properly access the ducts for cleaning and
inspection. The tools used in the installation of the new service openings should be industry-specific for the type(s) of
duct material and construction techniques commonly found in HVAC systems. Proper installation of new service openings
is dependent on the use of the right tool(s) by trained personnel. Nothing in this Standard is intended to prevent the use
of new methods, materials, or technologies in the installation and closure of service openings, provided that they meet the
requirements prescribed by this Standard.
Poorly constructed service openings may have a negative impact on the HVAC system. An air duct system, when
improperly altered, may compromise the system’s structural integrity and fire-rating integrity. Improperly installed service
openings may act as a site for duct leakage. An improperly created or sealed service opening may affect indoor air quality
by serving as a conduit that can expose both the HVAC system and the indoor environment to contaminants. These
potential threats to the safety of the building and its occupants are just two of the reasons for this Standard.