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Your HVAC Ductwork Guide

Ducts are an essential part of most HVAC systems. They carry heated or cooled air from your furnace or A/C and deliver it to the rest of your house. How do they work, though? Here are some HVAC ductwork basics.

How Ducts Work

It starts with the return air ducts. These take in the air from your home and deliver it to your air handler (i.e. your furnace or A/C). The return vent is also often where the air filter is, which eliminates contaminants. Once the air reaches the air handler, the unit heats or cools it as needed, before sending it back out through the supply ducts to circulate through your home. That air then goes back through the return ducts, and the cycle continues.

There are two types of HVAC ductwork. In a central plenum, all of the ducts originate from the same place. In an extended plenum, one supply duct is connected to your HVAC system, and the others branch off from it to feed the rest of your home.

Other HVAC Ductwork Basics

There are several other components that allow your to ductwork function properly. Turning vanes, for instance, help reduce resistance as ducts changes direction, allowing air to flow more easily through the system.

Vibration isolators are a rubber material that cut down the vibration made by the blower, allowing air to be distributed more quietly. This is not to be confused with volume control dampers, which control how much air is distributed to any particular area.

Volume control can be done manually, by adjusting how much air comes through the vents. However, in a zoning system, there are also automated dampers, which allow air to be distributed in smaller or larger amounts to each zone as needed, to keep it at its ideal temperature. Each zone’s automated dampers are part of a terminal unit, which may also contain a basic heating and/or cooling element, to help ensure the area stays at its ideal temperature.

To learn more HVAC ductwork basics, contact us at Beyer Boys. We provide San Antonio with quality home comfort solutions.