Valve module and filter

An apparatus for delivering a flow of gas, comprising:

• a housing with a gases outlet for delivering a flow of gas to a patient;
• at least one gases inlet;
• a filter to filter gases that have been received from the at least one gases inlet;
• a valve module that is removably engageable with the housing, wherein the valve module comprises a flow control valve and a valve manifold to receive gas from the flow control valve, and wherein the valve manifold has a valve manifold gases outlet that is arranged to deliver the gas from the flow control valve to the filter.

A valve module for an apparatus for delivering a flow of gas, the valve module comprising:

• a flow control valve, wherein the flow control valve is arranged to control a flow of gas,
• a valve manifold to receive gas from the flow control valve, the valve manifold having a valve manifold gases outlet that is arranged to deliver the gas from the flow control valve to a filter module,
• wherein the valve module is removably engaged with a housing of the apparatus, and
• wherein the valve manifold has a valve manifold gases inlet.