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.
Trigger Price Mechanism (TPM) and the GATT Policy Negotiations. In relation to the GATT Policy Negotiations, Christopher Mark (1993) provided the following explanation and/or definition of Trigger Price Mechanism (TPM): Refers to a mechanism for controlling imports of sensitive products by establishing a minimum âfair priceâ for the imported goods.