![]() The best method for determining system size is to use a Manual J load calculation for the entire home or building. The total number is determined by the unit size of the AC, heat pump or air conditioner in tons/BTUs. How many cubic feet per minute, CFM, does your system’s blower need to move to provide sufficient air flow and circulation in your home and to each room? This will result in significant temperature imbalances that nobody will like. Ductwork that is too large won’t have enough pressure, and the velocity of air won’t carry it to the furthest reaches of the home or building. This is vitally important, something we’ll belabor a bit, because ducts that are too small or narrow will wreck efficiency and make the system work too hard, leading to early mechanical failure. Getting these data right means you’ll get the ductwork size right. Note: Maximum Friction Rate: 0.1 inWg/100ft Ductwork Sizing Calculator – Step by StepĬFM, Maximum Friction Rate and Maximum Velocity – what are these? How are they determined? You have two or three options for rectangular ducts that give you the same or nearly the same square footage per duct. ![]() One size is given for round ducts, its diameter. If you decide to get professional guidance and ductwork estimates, use the Free Local Quotes option or the toll-free number on this page for convenient, no-obligation advice and cost estimates.ĭo your own calculations and compare them to our chart – or use the chart for quick, accurate calculations for duct size based on CFM needed for a room. Planning to call a pro? The information here will make you a savvy homeowner that can discuss duct sizing with an HVAC professional, and you’ll have a good sense of whether their calculations are accurate. As explained below, you must know the CFM needed for your entire home and for each room you are sizing ductwork to serve.īelow the calculator, each step of the process is explained in detail, so you can be sure that you’ve got the right duct sizing information for a home that is properly heated and air conditioned Here is the calculator for homeowners with significant HVAC experience and for HVAC pros who understand what these boxes are asking for. Step 1: CFM – System Size & Blower Size.Ductwork Sizing Calculator – Step by Step.Click OK to return to confirm the changes and close the dialog.In this example, we have set the Finished Floor to Bottom to 117". Set the Finished Floor to Top/Bottom to match the height of the molding polyline.Set the Width, Height, and Depth as needed.įor these types of symbols, if the size of the duct was modified, it's best to check the Retain Aspect Ratio check mark before making any modifications.On the General panel of the Fixture Specification dialog that displays:.Using the Select Objects tool, click on the fitting to select it, then click the Open Object edit button.If necessary, you can temporarily disable snap settings by holding the Ctrl/Command key on your keyboard while placing the fitting. In this example, we will be using the Cross fitting found within the 90 Degree Transitions subfolder. From a plan view, open the Library Browser, browse into Chief Architect Bonus Catalogs> HVAC No.2 Spiral Ducting, and select the symbol you wish to place.To avoid this, draw a Selection Marquee around the polyline to select the entire object in order to re-position it.ĭuct transitions, reducers, and vents are available as 3D Symbols that can be placed to create a more accurate representation of how your ducting will be built. Because the start and end points on a vertical line share the same X and Y coordinates, a vertical 3D Molding Polyline will display in Plan View as a single dot, though if you click once to select it, only one of the two points will be selected and modified. ![]() This can be used to control where the molding is generated, and it can then be selected and moved in Plan View to align it with the other molding polylines.
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