The ventilation system is designed to circulate the air through the unit while in the "Open" or “Normal” settings and will automatically shut off when sensing out side hazardous conditions (Low O2, High LEL). The main components are the Filter, Circulation fan, Inlet and outlet Isolation valves and ducting.

       Air flow comes in from the head of the bed and out through the foot of the bed. Stream #1 will have a hepa or dust filter for “normal” ventilation conditions. The operator will be able to switch over to stream #2, the bio/chem. filter, if conditions warrant the need. The fan is utilized to circulate air through the unit and is not normally “ON” unless automatically activated by a sensor input (i.e. low O2).

       The fan can be turned to a constant “ON” position. The vent isolation valves are used to open or close main venting and rebreather systems and are tied into the O2 sensor, smoke detector & LEL sensor for auto responses. In case of total power loss they will fail open. The ventilation system has two streams with 1.25” ducting as a redundant safety feature in case one of the fans fail or a valve gets stuck shut.

       The rebreather system is activated when the ventilation system is shut off. The isolation valves will open and the unit will begin to circulate the air. This system will provide a breathable atmosphere for up to 3 days. The rebreather system acts to “Scrub” carbon dioxide from the air and inject small amounts of O2 into the air stream.

       After the system is exhausted and the O2 levels begin to fall below 19.5%, the main ventilation system will automatically open to outside atmosphere and the fans will activate to restore normal O2 levels. If the activation of the ventilation system fails to restore internal conditions to a habitable state after a preset period of time, both doors will automatically open in an effort to gain the needed O2.

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       The heating and air condition system is mounted in the aluminum framing below the mattresses and is fully incased to prevent potential leakage into the unit living space. The unit has a ducting system to pull and discharge condenser air flow which would pull refrigerant gas out were the unit to develop a leak.

       The sleeper unit has a refrigerant sensor that will sense R. gas within the casement and the living space and sound an alarm for safety and will automatically open the unit if not in emergency mode setting.