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In most residences, the design of ductwork is as important as the HVAC equipment that supplies it with air. Just as the wrong type of equipment can cause poor temperature control and high energy bills, so can the wrong type of duct system. After analyzing the best design for your home’s ductwork, Bardi Heating and Air Conditioning may recommend one of the following duct systems:

Extended Plenum System

An Extended plenum system, which features a main duct that feeds branch ducts that connect to air registers, is the most common type of residential duct system. Extended plenum systems have at least five advantages:

• Easy installation due to long runs of same size ductwork
• Balanced airflow due to central trunk
• Easy to install and reinstall
• Ability to be concealed in a basement or a crawl space
• Low installation cost

The main duct in the plenum should not extend beyond 24 feet on either side of the supply unit, which makes an extended plenum system a poor choice for certain types of large homes.

Radial System

A radial system, which features branch ducts that extend directly from the supply unit’s plenum, is the second most common type of residential HVAC system design for ductwork. Radial systems have at least five advantages:

• Easy installation due to ductwork that runs straight to registers
• Balanced airflow due to central location of supply unit
• Easy to conceal in crawl spaces and attics
• Extremely adaptable for single story homes
• Usually the lowest cost ductwork plan of all

Because of their ducts that extend straight from the supply unit to air registers, radial systems are found almost exclusively in one-story homes.

Reducing Trunk System

A reducing trunk system, which features reduced trunk size after each branch takeoff, is usually placed in custom homes. Reducing trunk systems have at least four advantages:

• Extremely quiet due to minimized air turbulence
• Perfect airflow due to specially engineered branches
• Ideal for when the supply unit must be placed at one end of the home
• Easy to conceal in the same way as extended plenum systems

Because reducing trunk systems are specially designed, they are seldom recommended for fabricated housing.

Gravity System

A gravity system, which uses natural convection to circulate air through ductwork, resembles a radial system, and is usually implemented with a coal or wood burning furnace. Gravity systems have at least four advantages:

• Extremely quiet performance due to no blower use
• Opportunity to decrease use of utility energy
• Easy installation due to ductwork that runs straight to registers
• Balanced airflow due to central location of supply unit

As with radial systems, gravity systems are found predominately in one-story homes.

Do You Need a New HVAC System?

If you need a new HVAC system, Bardi Heating and Air Conditioning has the expertise you need. Before you decide on a certain ductwork plan, let our NATE certified technicians examine your residence. We may be able to suggest a plan that works better and costs less than the one you are considering. For furnace replacement, air conditioning replacement, new ductwork, and HVAC maintenance, call Bardi toda