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).
When surveys and naturalistic observations reveal that one trait or behavior accompanies another, we say the two correlate. A correlation coefficient is a statistical measure of relationship. A posi- tive correlation indicates a direct relationship, meaning that two things increase together or decrease together. A negative correlation indicates an inverse relationship: As one thing increases, the other decreases, and vice versa.