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Roof ventilation ratios: specifications for roof intake, Roof ridge outlet ventilation product examples: sq.in. of net free ventilation: gaf cobra® ridge runner™ exhaust vent : 12.5 sq.in. per linear foot, covered by cap. Asphalt shingle re-roofing guidelines: how to do a roof, Asphalt shingle re-roofing guidelines: how to do a roof-over vs doing a tear-off. Shingles at sutherlands - sutherlands lumber and home, Find value and selection on shingles products at sutherlands..