A roof ridge ventilator to be installed under a cap shingle includes a one piece cover member of an elongated shape including a pair of flaps, each flap having one upper surface over which cap shingles are secured and also having downwardly facing lower surfaces, a pair of vents respectively secured...http://www.google.com.au/patents/US5070771?utm_source=gb-gplus-sharePatent US5070771 - Roof ventilator
