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.
Summary of Trigger Price Mechanism. A program of import surveillance instituted by the U.S. government in 1977. Under this scheme, a floor price is established for designated import items; this floor is predicated upon the production cost of the most efficient foreign producer, with adjustments for freight and currency fluctuations.