S Your new gas furnace may have been installed in one of two. ways, as a direct-vent (2-pipe-Fig. 2) application or as a. non-direct vent (1-pipe-Fig. 3) application. S In a direct-vent (2-pipe) application,your furnace uses air. from outside the home for combustion and ventsflue gas to the. outdoors.
For the biological concept, see Anti-predator adaptation. A defence mechanism is an unconscious psychological mechanism that reduces anxiety arising from unacceptable or potentially harmful stimuli. Sigmund Freud was one of the first proponents of this construct.
31 Psychological Defense Mechanisms Explained. A look at common defense mechanisms we employ to protect the ego. In our last article, Defense Mechanisms: Psychological Techniques We Use to Cope With Anxieties, we looked at the way in which the psyche deals with unconscious anxieties.