Polycarbonate vent tape is the breathable, vented tape that seals the bottom edge of twin-wall polycarbonate panels on greenhouses and high tunnels. It lets condensation drain and the panel flutes vent while keeping dust and insects out of the channels, so the lower edge of your panels stays clear instead of clouding with trapped moisture.

Each roll measures 1" wide by 110' long, enough to seal a full run of panel ends. Vent tape is one half of a two-tape system: run this breather tape along the bottom edge and solid aluminum foil seal tape along the top, then finish both edges with a profile or U-channel that holds the tape and sheds water. It fits 8mm twin-wall polycarbonate and is also sold as vented tape, ventilated polycarbonate tape, breather tape, or anti-dust tape.