R.C.S.A. § 14-275a-25
Air filter
Cite as Conn. Agencies Regs. § 14-275a-25
(a) Each school bus engine shall be equipped with a dry element type air filter.
(b) All diesel engine air filters shall include a latch-type restriction indicator that retains the maximum restriction developed during operation of the engine. The indicator should include a reset control so the indicator can be returned to zero when desired.