The location

The location and size of new service openings is heavily dependent upon the equipment and methodologies the HVAC
system cleaning contractor will use in the project. However, there are certain strategic locations in most systems where
service openings are made to facilitate inspection. Visual inspection of interior HVAC system surfaces is required as
noted in this Standard.
The most common locations for service openings in air ducts include:
• Adjacent to turning vanes
• Adjacent to dampers (balancing, fire, control, back draft, splitter, etc.)
• Mixing & VAV boxes
• Adjacent to in-duct electric heat strips
• Duct transitions, offsets, and changes of direction
• Adjacent to heating, reheat, & cooling coils
• Adjacent to all other in-duct mechanical components & sensors