In 1955, the Pizza Hut restaurant was first commenced. Its first logo featured its only mascot Pete holding the words Pizza and Hut. 1967â1999. In 1967, the chain began using a new and simplified logo featuring the now-famous red roof design (which is still used albeit in a modified form today).
Oxygen therapy can be delivered using a low flow or high flow system. All high flow systems require humidification. The type of humidification device selected will depend on the oxygen delivery system in use, and the patient's requirements. The humidifier should always be placed at a level below the patient's head.
Delivery: Breathing circuits. 1  closed (fresh gas inflow exactly equal to patient uptake, complete rebreathing after carbon dioxide absorbed, and APL closed) 2  semi-closed (some rebreathing occurs, FGF and APL settings at intermediate values), or. 3  semi-open (no rebreathing, high fresh gas flow [higher than minute ventilation]) Open systems have no valves, no tubing: for example open drop ether, or a nasal cannula. In either, the patient has access to atmospheric gases. Non-rebreathing (Mapleson) breathing circuits. Photograph of the Mapleson D. Click on the thumbnail, or on the underlined text, to see the larger version (136 KB). All non-rebreathing (NRB) circuits lack unidirectional valves and soda lime carbon dioxide absorption: thus, the amount of rebreathing is highly dependent on fresh gas flow (FGF) in all. Work of breathing is low in all (no unidirectional valves or soda lime granules to create resistance).