Every shrink wrap cover must be ventilated to eliminate moisture and condensation under the cover.
Our DS-683 self-adhesive
shrink wrap vent allows cross flow ventilation throughout the cover minimizing chances of excess moisture and mildew.
The number of vents will vary according what you are covering, but a minimum would be 3 vents for runabouts and up to 8+ vents for boats 34 foot and above. Cabins and seat cushions should also be left open to help stimulate ventilation. Refer to the prior tip (link below) for more information on venting based on your boat size.