One-piece construction. 3/8" x 1/2" slotted weep holes in wind baffles for water run-off. 1/8" x 1" louvered openings inverted to block weather infiltration. Can be cut to desired length at 2-foot intervals. Pre-notched nail holes. 2" widenailing flange. Male/female connections - no straps necessary. Adjustable from 3/12 to 12/12 roof pitches. 18 square inches of net free ventilating area per lineal foot. Miami Dade County Approved 11-0602.01. 43 CFM at wind velocity of 3 MPH; 117 CFM at wind velocity of 8 MPH; 221 CFM at wind velocity of 15 MPH.