Special Includes:20 Vents Cleaning + Free One Dryer Vent Cleaning + Free Unlimited Duct Trunks Cleaning (REG. $50.00 EACH) + Free Unlimited Return Vents Cleaning + Free Furnace Inspection! Sears uses a negative air flow process with truck-mounted or HEPA-filtered vacuums. We clean all ducts and returns with air blowers, brushes and/or whips pushing debris to vacuum. All access holes are replaced according to NADCA specifications. *Additional vents $20.00 each