Finest Practices for Ensuring Proper Roof Air Flow A well balanced consumption and exhaust air vent ratio, generally 1:300, plays a pivotal function, with consumption vents preferably placed at the lower edge of the roofing system for amazing air access and exhaust vents at the height for warm air departure. https://angeloihula.wikiap.com/977655/important_questions_to_ask_gainesville_roofing_companies_before_employing