Poly Tak's HVAC Mask is made from a 3 mil polyethylene film that is coated with an adhesive. This premium HVAC Mask film is great for protecting HVAC Ducting and connectors from dirt, dust and other contamination. This HVAC mask is able to provide UV protection, excellent puncture and moisture resistance. Poly Tak's HVAC Mask will satisfy SMACNA guidelines by temporarily closing the open ends of duct work to ensure the interiors are protected from contamination.