Do vent-free heaters take all of the oxygen out of the room?
All products which burn gas and draw combustion air from the living space “take oxygen” from that space, (Gas ranges are vent-free units). The owners manuals on our products and your local code official will inform and instruct about the need for make up combustion air. Vent-free heaters have an ODS or Oxygen Depletion Sensor which automatically shuts off the gas supply in the rare event that the oxygen level in the room falls to 18% This is above unsafe levels as established by ANSI (American National Standards Institute).
