The HVAC Knowledge Base

HVAC ENCYCLOPEDIA

In-depth articles on every HVAC system, component, and concept.

Diagram: Air Handlers: Components, Types, and Selection
Encyclopedia

Air Handlers: Components, Types, and Selection

An air handler, also called an air handling unit (AHU), is a factory-assembled device that conditions and circulates air as part of a heating, ventilating, and air conditioning system. It connects t…

Diagram: Static Pressure in HVAC: Diagnosis and Solutions
Encyclopedia

Static Pressure in HVAC: Diagnosis and Solutions

Static pressure is the force that air exerts against the interior surfaces of ductwork, plenums, and HVAC components as the system pushes conditioned air throughout a building. Think of it as the re…

Diagram: Ductwork Design: Manual D and Proper Air Distribution
Encyclopedia

Ductwork Design: Manual D and Proper Air Distribution

Ductwork is the circulatory system of any forced-air HVAC installation. It carries conditioned air from the furnace, air conditioner, or heat pump to every room in the building and returns spent air…