Inspecting Ductwork
The ductwork is the circulatory system for a building's air. On rooftop units, exposed ductwork is particularly vulnerable to damage, which can lead to major energy loss and water intrusion.
Down-shot Configuration: The ductwork goes directly from the bottom of the unit through the roof curb. No ductwork is visible on the roof.
Side-shot Configuration: The ductwork exits the side of the unit and runs across the roof before penetrating it. This exposed ductwork is what requires inspection.
Ductwork Inspection (Side-Shot Units)
For units with exposed, side-shot ductwork, a careful visual inspection is necessary to ensure the system is sealed and efficient.
What to Look For
- Seams and Joints Check all connections and seams in the ductwork. They should be completely sealed with no visible gaps.
Common Problems & Red Flags
- Openings or Cracks Any visible hole, crack, or separated seam is a major issue. This allows conditioned (heated or cooled) air to escape, wasting energy and forcing the unit to run harder.
- Water Intrusion Risk Poorly sealed ductwork also provides a pathway for rain to enter the system and potentially leak into the building, causing significant water damage.
Pro Tip: The Compounding Cost of Leaks
Even small air leaks add up. A duct system with just a few minor gaps can lose 20-30% of the air that moves through it, leading to significantly higher energy bills and reduced comfort.