B. 1. Except as otherwise provided by this subsection, the board shall also levy an annual assessment sufficient to care for the cost of operation of the district and the maintenance of the fire department and its equipment, and for payment of salaries of the officers and employees of the district, provided, that no such annual assessment for operation, maintenance, and salaries shall exceed seven (7) mills on the dollar of assessed value of the property in the district.

2. The board may levy an assessment over seven (7) mills but not to exceed ten (10) mills upon approval for such at an election held at such time and in such manner as provided by Section 901.5 of this title for election of board members.

3. If a county approves an exemption of household goods of the heads of families and livestock employed in support of the family pursuant to the provisions of subsection (b) of Section 6 of Article X of the Oklahoma Constitution, the millage rate of any levy authorized by this section for the property located in a fire protection district which is in such county shall be adjusted by the millage adjustment factor set forth in subsection (b) of Section 8A of Article X of the Oklahoma Constitution.