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.
Forensic psychology See Character Defence, Denim Defense, Insanity Defence Immunology A mechanism by which an organism protects itself from foreign antigens and pathogens Malpractice Any legal argument offered by a defendant that would either preclude or mitigate recovery of damages for a wrong allegedly committed by the defendant