A humidifier for an airway pressure support system for delivering a humidified flow of breathing gas to an airway of a patient, the airway pressure support system comprising a patient interface device and a gas flow generator, the gas flow generator being configured to generate the flow of breathing gas to be delivered through the patient interface device to the airway of the patient, the humidifier comprising: a water chamber structured to house a volume of water; a conduit comprising: a first end structured to be fluidly connected to the gas flow generator, an opposite second end structured to be fluidly connected to the patient interface device, and a wall portion defining an interior pathway extending between the first end and the second end, the interior pathway structured to convey the flow of breathing gas between the first end and the second end; a nozzle fluidly connected to the water chamber and configured to produce a water droplet from water received from the water chamber; a heater plate coupled to the wall portion and exposed to the interior pathway, the heater plate positioned to receive the water droplet from the nozzle; and a separator feature coupled to the wall portion and configured to shield the water droplet from the flow of breathing gas, characterised in that the separator feature is a pocket extending away from the interior pathway, the pocket is defined by a receiving member coupled to the wall portion, and the humidifier further comprises a number of frame members (170,171) coupled to the wall portion, wherein the receiving member is coupled to the frame members by a tongue and groove mechanism. a water chamber structured to house a volume of water; a conduit comprising: a first end structured to be fluidly connected to the gas flow generator, an opposite second end structured to be fluidly connected to the patient interface device, and a wall portion defining an interior pathway extending between the first end and the second end, the interior pathway structured to convey the flow of breathing gas between the first end and the second end; a first end structured to be fluidly connected to the gas flow generator, an opposite second end structured to be fluidly connected to the patient interface device, and a wall portion defining an interior pathway extending between the first end and the second end, the interior pathway structured to convey the flow of breathing gas between the first end and the second end; a nozzle fluidly connected to the water chamber and configured to produce a water droplet from water received from the water chamber; a heater plate coupled to the wall portion and exposed to the interior pathway, the heater plate positioned to receive the water droplet from the nozzle; and a separator feature coupled to the wall portion and configured to shield the water droplet from the flow of breathing gas, characterised in that the separator feature is a pocket extending away from the interior pathway, the pocket is defined by a receiving member coupled to the wall portion, and the humidifier further comprises a number of frame members (170,171) coupled to the wall portion, wherein the receiving member is coupled to the frame members by a tongue and groove mechanism.