(a) Electromechanical and Mechanical Sirens. Class A electromechanical and mechanical sirens shall be mounted outside, between the grille and radiator, or under the hood. Class B electromechanical and mechanical sirens shall be mounted outside or between the grille and the radiator. Mechanical motorcycle sirens that do not operate when the vehicle is stationary shall not be installed on motorcycles manufactured after January 1, 1981.

(b) Electronic Sirens. Class A and B electronic sirens installed after January 1, 1976, shall be mounted outside or with the horn opening facing forward ahead of the radiator with a relatively open path for the sound to project forward. The horn axis shall be parallel to the road and vehicle centerline.

(c) Dual Speakers. Dual speakers for electronic sirens shall be connected in phase and mounted so that the speaker axis is parallel to the vehicle centerline or angled outward not more than 10 degrees to the sides.

(d) Speakers in Lightbars. Electronic siren speakers may be mounted facing forward behind a speaker grille in a lightbar.

(e) Transfer. A siren, except a motorcycle mechanical siren, meeting the requirements established by the department at the time it was first installed on an authorized emergency vehicle may be transferred between authorized emergency vehicles by the owner or sold by the owner for use on other authorized emergency vehicles.