Below is a chart that will help you decide what size shrinkwrap will work best for your application. This chart also gives you an idea of how many vents you should use for ventilation. These sizes are approximate. Make sure and measure each boat to ensure the proper size shrink wrap is being used. REMEBER: It is better to over ventilate! Film Size Sq. Ft. Boat Size Beam # of boats / roll # of vents Type of Boat 12' X 175' 2100 0-16' up to 7' 8 4 Fishing boats & boats with low windshields 14' X 150' 2100 14'-19' up to 8' 6 4 Runabout with full windshields 17' X 120' 2040 17'-24' up to 8.5' 4 6 Pontoons and cuddy cabins cruisers 20' X 100' 2000 22'-26' up to 8.5' 3 6 Express Cruisers 24' X 120' 2880 25'-29' up to 9' 3 6 Express Cruisers with arches or small fly bridge 26' X 110' 2860 28-31' up to 10' 2 8 Very little waste on wider, taller flybridge boats under 32' 32' X 100' 3200 30'-38' up to 11' 2 8 Good for a wide and tall flybridge boat with 36' X 100' 3600 36'-43' up to 13' 1 10 Good for wide beam craft with arches and bridges 40' X 100' 4000 44'-60' up to 18' 1 12 Covers extremely large boats with arches, bridges, ect. #DIY #Product Information #Shrinkwrap #Winterization