Patented added-pitch design shows more shingle profile and less vent opening for clean, eye-pleasing aesthetics. Easily adapts to a peak vent or flash vent. For roof pitches from 3/12 to 12/12. Patented internal baffle keeps blowing snow and rain from entering, while internal filter blocks out natural elements leaves and pine needles. Available 9" or 11" widths. Low-profile design is unobtrusive, but also crushproof with nailing supports and structural ribs; withstands falling tree branches, hammer blows and cracking. Self-aligning interlocking ends deliver quick alignment and ensure blocking of natural elements and weather. Built-in end caps adjust to roof pitch while ship-lap design allows for expansion and contraction during temperature extremes. Limited lifetime warranty.