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There are two major systems to classify ductwork airtightness, one based on European standards, the other based on ASHRAE standard 90.1-2010.Both are based on the leakage airflow rate at a given ductwork pressure divided by the product of the ductwork surface area and the same ductwork pressure raised to the power 0.65.
Seven major factors go into scores for ratings, with each adding or subtracting points from a 100-point scale that's mapped to letter grades, according to BBB's rating overview. Those factors include:
The Better Business Bureau (BBB) is an American private, 501(c)(6) nonprofit organization founded in 1912. BBB's self-described mission is to focus on advancing marketplace trust, [2] consisting of 92 independently incorporated local BBB organizations in the United States and Canada, coordinated under the International Association of Better Business Bureaus (IABBB) in Arlington, Virginia.
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The Hartford Steam Boiler Inspection and Insurance Company (HSB) is a global specialty insurer and reinsurer headquartered in Hartford, Connecticut.It was founded in 1866 and is the largest provider of equipment breakdown insurance and related inspection services in North America serving over five million commercial locations.
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related to: air duct cleaning bbb rating requirements neartrustedhippo.com has been visited by 10K+ users in the past month