3' X 6' PVC blade with upper and lower edges reinforced to provide extra stiffness for long spans with minimum deflection. Opti-Wave drift modules are assembled using spacers designed to secure the wave sections uniformly spaced at 2" increments. The Opti-Wave Drift Eliminator is designed primarily for counterflow towers with air velocities up to 600 fpm. Maximum drift rate is .02%. For crossflow installations, the wave spacer is perforated to permit drainage of the accumulated drift back into the fill section. Maximum drift rate is .02% at 550 fpm.