This allows the supply of air to circulate every corner of the room. Tips for a Good Return AirĪ good air conditioning system shall have the return air place on one side of the room while the supply air is on the other side of the room. If the insulated flex duct is torn, fiberglass is exposed. When installing a flex duct, try not to place it next to sharp edges such as ceiling support brackets to prevent the flex duct from tearing off when in contact with sharp edges. Allergy reactions may occur if you touch the fiberglass and a sore throat may happen if you inhaled it. Wear mask and gloves when handling fiberglass. Things to Watch Out When Installing Flex Duct for Return AirĪlthough flex duct is convenient, fiberglass insulation is harmful to the human respiratory system. However, it is not suitable for insulated flex duct and air conditioning return air uses insulated flex duct. Thus, the attachment must be able to hold up strongly for years to come.Īccessories such as metal clamp can be used to attach flexible duct to the collar. Flex duct experiences vibration during operation, especially with strong airflow. This guideline from SMACNA is to ensure the collar and the flex duct are attached firmly. The attachment is by means of duct glue and aluminum tape. The collar shall have at least 50 mm of length for the attachment of the flex duct. Return air grille shall have a plenum box with a collar for flex duct to attach. We also offer the following additional apps for the iPhone and iPad:ġ.Collar to which the flex duct is attached shall be at least 50 mm in length
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This app now includes the HVAC Equipment Locator which allows you to keep track of all of your equipment and store it in the cloud. In addition, we developed a number of customized apps for ASHRAE, DNV GL, and other organizations.
How to use mcquay duct sizer software#
In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. The "HVAC Duct Sizer" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. CSV attachment that can be imported into any popular spreadsheet. This app now works on your iPhone and iPad and adjusts its screen size accordingly.įinally, you can email all of the inputs and results from all 3 input modes to perform further analysis using your desktop computer. This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. You can also choose to display values in either English (IP) or Metric (SI) units. You can specify additional parameters such as the duct shape (rectangular, round, or oval), the air temperature and the air pressure. In the "Range of Duct Sizes" mode, you can specify minimum and maximum friction loss and airflow values to display a range of duct sizes that fall in between the friction loss bounds. There are options to input the existing duct dimensions and one of either the airflow or velocity values to derive the calculated duct friction loss. In the "Size by Dimensions" mode, you can analyze an existing duct system. The results include both the exact and rounded height and width (or diameter) dimensions and the calculated velocity and friction loss. In the "Size by Airflow" mode, you can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters).
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Think of this application as a digital version of the classic Trane Ductulator. The Duct Sizer application allows you to quickly size one HVAC duct run or a range of duct sizes using the constant friction method. "I'll be presenting your iPhone program to my HVAC class as an easy compact tool to have in hand when making sales and service calls." - R. Just a couple of comments from our users: This app includes the HVAC Equipment Locator. The HVAC Duct Sizer is a universal duct sizing app so that it works on both the iPhone and iPad and adjusts its screen size accordingly. Tens of thousands of happy users have downloaded this useful application for performing quick and simple duct sizing analysis. The HVAC Duct Sizer app is the #1 selling duct sizing application for the Apple iPhone and iPad. HVAC Duct Sizer voted favorite mobile app by readers of Contracting Business magazine.