The ResMedTM AirSenseTM 10 and ResMedTM AirCurveTM 10 Machine Side Cover allows the machines to be used without activating the built-in heated humidifier. The side cover is attached to the machine's side where the chamber would normally be. For more, please visit: https://www.cpapoutlet.ca/product/resmed-airsense-10-autoset-card-to-cloud-with-humidair-and-slimline-tubing-37382/4493