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.
Intro to Defense Guardian. Defense Guardian is the defacto cooldown tank. With more cooldowns to offer than Shadow or Vanguard, Guardian combines in your face playstyle with damage control like no other. With the changes in 4.0, no situation is without a reprisal by the Defense Guardian.