Roof Ventilation Microporous PP Ridge Film from Canada
Microporous polypropylene film for roof ridge vents allowing attic moisture escape. HTS 3921.19.0010 classification for cellular microporous PP sheets in construction.
Duty Rate — Canada → United States
66.5%
Rate breakdown
9903.03.1450%Articles the product of Canada as provided in subdivision (b)(3) of U.S. note 51 to this subchapter
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• ASTM E2178-13 net free area testing validates ventilation performance
• Rolls for field fabrication remain plastic film; preformed vents become 3925.90
• UV stabilizer content disclosure for 20+ year warranties