An impingement apparatus associated with a conveyor includes: (a) a shell supporting an impinger; and (b) a coolant delivery apparatus enclosed by the shell, the coolant delivery apparatus including a gas circulation device for directing a coolant to the impinger; the impinger including: (i) an impingement plate including openings for directing impingement jets toward the conveyor; (ii) at least one non-circular cam in mechanical communication with the at least one conveyor and rotatable when the conveyor is in motion; and (iii) at least one connector in mechanical communication with the at least one cam and the impingement plate, the connector displaceable during rotation of the at least one cam to elevate and lower the impingement plate.