For this reason, the high-efficiency furnaces are sometimes referred to as âcondensing gas furnacesâ as that is what separates them from the previous configurations. With this in mind, there is no longer the need for exhausting through a B-vent but instead the exhaust can be directly through PVC pipe.
COGS also includes other direct costs such as labor to produce the product, supplies used in manufacture or sale, shipping costs, costs of containers, freight in, and overhead costs directly related to the manufacture or production activity (like rent and utilities for the manufacturing facility).
The horizontal axis measures time; the vertical, current or voltage. Direct current (DC) is the unidirectional flow of electric charge. Direct current is produced by sources such as batteries, power supplies, thermocouples, solar cells, or dynamos. Direct current may flow in a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams.