Back to Training HVAC 101 0% Complete 0/0 Steps Dampers Explained Insulation Check Finding Signs Of Rats In The Attic Space Drawing A System Duct Inspection Heating Sequence Of Operation - Standard Furnace Ladders, Drops & Attic Access 5 Inch Media Filter Replacement Remove Locking Refrigerant Caps HVAC 101 Ladders, Drops & Attic Access Video 7 of 9 In Progress ← Previous Next→ Ladders, Drops & Attic Access Getting into the attic space takes some preparation.