The Clean Storm 1138B Air Duct Cleaning Sticky Plastic Film is an essential accessory engineered for HVAC professionals during air duct cleaning and restoration procedures. Measuring 8 inches wide, this durable self-adhesive film provides a secure, temporary seal over vent registers and duct openings to optimize system static pressure and prevent particulate migration. Specially designed for use during negative air pull and Duct Leakage Testing (DLT), it adheres tightly to sheet metal, plastic, and painted surfaces without leaving gummy residue upon removal, ensuring a fast setup and clean teardown on every job site.