What Is the Stack Effect

What is the stack effect?

A) A small boiler working at maximum efficiency slowly and steadily raises the temperature before turning itself off for a long period.
B) Escaping warm air draws in new cold air through similar gaps at the bottom of the house
C) This concentrates insulation and minimizes glazing on this side of a house.
D) Collecting waste and valuing it by reusing certain types in a closed-loop model or reselling or distributing unwanted items