The less static pressure available, the larger the ductwork required. If projected velocity seems too high for the system, select the next-largest duct size. The total effective length TEL equals the measured length from the farthest supply outlet, through the equipment, and to the farthest return outlet—plus the equivalent lengths of all turns and fittings.
Friction rate gets calculated based on the pressure drop per feet. TEL takes into account the pressure drops that will happen from splits, turns, and other fittings in the HVAC ductwork plan. Instead of trying to calculate all of those individual instances of pressure loss, HVAC professionals measure the length of straight duct run that would create the same pressure drop, which is called effective length. Each fitting has an effective length that equates its pressure drop to an equivalent amount of straight duct.
To configure TEL, add up the effective lengths of all fittings in the most restrictive run and add that number to the length of the straight sections between the return and supply in that run. Equivalent lengths of turns and fittings between the start and end of straight duct: feet.
There are a few other important factors to consider when using a free HVAC duct sizing calculator to determine HVAC duct dimensions and sizing, such as ducting material type. Do you plan on installing an HVAC rectangular duct or round duct? Keep in mind, duct material choice also affects airflow resistance and static pressure, therefore calculations for flexible duct sizing differ slightly from sheet metal ductwork. Flex duct CFM will measure less than the airflow in sheet metal and for coated fiberglass duct board.
Rigid sheet metal provides the least airflow resistance. In the ServiceTitan Ductulator, select the type and shape of duct you plan to use to get the correct corresponding measurements in the duct size chart. Want to grow your HVAC business? Learn more about what HVAC software can do for you by scheduling a demo today.
Contractors master business growth with this powerful tool. Mac App Store Preview. Screenshots Mac iPhone iPad. Description The Duct Calculator App is a modern take on a the classic duct sizing wheel. Apr 23, Version 1. Bug fixes and improvements. Ratings and Reviews. App Privacy. Size Category Utilities. Compatibility iPhone Requires iOS Mac Requires macOS Languages English. App Support Privacy Policy. Family Sharing With Family Sharing set up, up to six family members can use this app.
More By This Developer. Psychrometric Chart. Duct Sizer. Duct Calculator is a powerful tool that provides access to duct calculation and sizing capabilities either Designed to work like those conventional cardboard duct calculators that HVAC engineers are so familiar with This calculation program on Excel makes it possible to dimension and carry out the calculation of the pressure losses Psychrometric Chart Duct Calculator is a precise DuctSizer is a tool that can quickly find the correct round, rectangular or oval duct size to fit on your inputs.
The application calculates equivalent rectangular duct Ductuputer for Windows is a duct sizing calculator that can find air volume, velocity, friction loss and duct size only by entering any two factors. This useful This is a duct design application that helps you optimize your designs while maintaining a minimum pressure system.
Loss Calculator quickly identifies
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