These requirements cover the construction and performance of inferential ultrasonic and magnetic type residential water flowmeters intended for use in dry@ indoor atmospheres@ and for cold water supplies in a completely wetted pipe section when: a) Connected directly to residential sprinkler fire protection systems; or b) Connected to combined domestic plumbing and residential sprinkler fire protection service (multipurpose fire protection system) when installed as specified in the Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes@ NFPA 13D.