162 3. Technical foundations 3.1 Technology of the application of air mixtures with increased Po2 3.1.1 Theoretical aspects In order to keep the expense and, in particular, the O 2 requirement for the implementation of the O2MT as low as possible, the problem in the O2 application must be solved in such a way as to allow only a slight O2 loss. In addition to this, the technical solution must not cause more Jnflow Outflow Normal air(physi) Symbol Level Symbol Level Symbol Level Total volume flow F + 7-IOlmin' 1 F~ -F + — — 0 2 -concenfration c i 40% C °2 ~35% c* °2 21% C0 2 ~ concentration c co 2 4 1% c co 2 ~ 5% r* l co 2 ^0 rel.air humidity f + ~f* , lor~60°M' f- ~95% f* 40 -607. Temperature $* ~?* (or-37%)1 g ~37°/o g* 18-22 °C Heat flow — — # ^kcallmin — — Fig. 160 The significant factors to be considered in the administering of O 2 enriched air 1 Without warming and moistening of inhalation air in the nose-throat area (e a when... .. e. . for the 36 h 02 multistep therapy processes GK 4-I to GK 4-IV nose tube is used). Figures