Ductwork Design: A Proper System Fulfills Several Objectives

Optimum performance and efficiency of your cooling and heating system begins with proper ductwork design.

This doesn’t happen by guesstimates or a one-size-fits-all approach. An HVAC professional utilizes data derived from Manual J and Manual D — the industry standard software produced by the Air Conditioning Contractors of America — to accurately calculate the heating and cooling load of the home and properly design ductwork to accommodate that load.

The result is duct efficiency above 80 percent. Failure to properly execute the ductwork design phase, however, can produce efficiencies as low as 60 percent or less. This can result in hundreds of dollars of wasted energy expense every year simply from design shortfalls.

The overall benefits of proper design are optimum interior comfort, proper air distribution and economical operation. In a forced-air system, these goals are best achieved with a design that meets these objectives:

  • Conveys cooled or heated airflow at consistent temperatures throughout the home and accommodates loads that have been calculated on a room-by-room basis.
  • Is sized using industry standard methods so that the static pressure drop measured across the air handler meets the specifications of the HVAC equipment manufacturer and the calculations of the design.
  • Utilizes sealed ductwork to convey the proper volume of airflow and to prevent infiltration of contaminated air into the system.
  • Incorporates sufficient return ductwork, properly located to provide adequate return airflow. Where possible, dedicated return ducts should be installed in every room with a supply duct.
  • Is balanced so supply ducts deliver airflow at positive pressure and returns convey air at slightly negative pressure. This maintains a condition of neutral air pressure in the rooms.
  • Minimizes thermal gain or loss occuring between the air handler and the rooms. Ductwork routed through unconditioned zones of acute temperatures such as attics or crawl spaces should be insulated.

Family owned and operated since 1910, Apollo Home Heating, Cooling & Plumbing provides Cincinnati homeowners with peace of mind and home comfort in all seasons. Ask us for more information about the performance and efficiency gains that result from proper ductwork design.

Image via Shutterstock.com

"Ernie & Mike did a superb job on my new furnace and A/C installation. Despite having more than a day’s work to do, they came in and stayed until the job was done. They were organized, efficient, and protected the rest of the house well. Got both furnace and A/C installed the same day. Ernie was courteous, informative, and clearly knew his job better than anyone I’ve encountered before. The units look so good guests now get The Tour of our new system. Apollo is clearly not a fly-by-night company. I would recommend them to anyone in need of a new furnace and/or A/C."
- Jerry A.
"I called Apollo because of a water leak I thought I had in our upstairs shower going into the kitchen. Robbie came and assured me everything was fine & looked at all the other plumbing. He ended up changing a few pipes for our washer & clearing a drain. He was very nice & knowledgeable with all my questions. I ended up signing up for the care plan & was very happy with my service."
- Cassandra B.
"The team at Apollo exceeded my expectations. As a business owner, my attention to the details and commitment to providing excellent service is high. From the sales rep. to the installation team, everyone’s performance was outstanding. For example, the installation team went to great lengths to protect our floors, placing floor runners and across the wood floors and up the stairs. They even were spot washing walls upon their departure. I highly recommend this company."
- Randy B.
"We scheduled an estimate AND a tune-up. We knew something was wrong with our furnace, but hoped we could make it through the rest of the season. Upon telling Bill what our furnace was doing, he warned us immediately what the possible outcome was going to be; a cracked heat exchanger. He watched the flames roll backward, tested carbon monoxide levels, which were so high they meter’s last reading was 5,600 before saying “high”. He immediately shut it down, tagged it, and explained that with levels that high and children in our home he wanted off right away. He continued his inspection and showed us via a camera that not only was it cracked in multiple places, but had holes all over it. He gave us a few options for repairing it; his knowledge as well as genuine concern was beneficial and refreshing. Luckily we also scheduled an estimator, Micah, to come too and we were able to get costs between repairing and replacing (with several options). We decided to replace with a much higher efficiency furnace and one sized properly to our home. Hands down, not only did they both provide us great service and knowledge, but without sounding dramatic, they may have saved our lives. This was our first time calling Apollo, but it won’t be our last."
- Sarah B.
"Apollo is an excellent company. I always receive great service. Alex A. was professional and friendly. He kept me informed during the process of checking my furnace and heat pump to make sure they were working properly. The company makes sure you are notified who is coming and when they are on the way. All my interactions with the company have been wonderful."
- Beverly S.
    Image

    Financing

    Image

    Apollo Care Plan