Back to Training HVAC 101 0% Complete 0/0 Steps Remove Locking Refrigerant Caps 5 Inch Media Filter Replacement Ladders, Drops & Attic Access Heating Sequence Of Operation - Standard Furnace Duct Inspection Drawing A System Finding Signs Of Rats In The Attic Space Insulation Check Dampers Explained HVAC 101 Duct Inspection Video 5 of 9 In Progress ← Previous Next→ Duct Inspection Mike goes over where to start and what to look for on a duct inspection in an attic.