An image forming apparatus includes a liquid ejection head, a head tank, a liquid storage container, a liquid feed device, a supply valve, an exhaust passage, a float valve, an air release valve, and a suction device. The novel circuit does not increase the requirement for slew rate and bandwidth of the amplifier. Therefore, the protective cover is frictionally engaged in the receiving area. In one embodiment, the method of replacing the acoustic liner from the forward end of the IEDM includes decoupling the bellmouth and forward end cap of the muffler section from the forward end of the IEDM and withdrawing the acoustic liner from the muffler section. In yet another aspect, a requesting party may provide an acknowledgement of receipt for one or more received notifications.