US Patent 7555811 Floor cleaning apparatus equipped with removable half-plenum

A floor cleaning apparatus includes a nozzle assembly having a suction inlet and a canister assembly having a housing including a dirt vessel receiver, a wall and a compartment. The wall includes an airpath opening. A dirt collection vessel is held in the receiver and a suction generator is held in the compartment. A plenum connects the airpath opening in the wall with the suction generator. The plenum includes a first section that removably connects to the housing.