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Residential Duct Sizing Guide - VirginiaAir

Residential Duct Sizing Guide Key Points to Remember when using this Guide The Sizing chart is designed for estimating the airflow in an average system. The chart assumes the blower motor and total effective length of the duct system to be adequate for a .1 friction rate. The chart should not be used to design complete duct systems. To insure proper distribution of air, volume dampers must be used for all branch runs. The chart is based on metal duct. Flex duct has a higher pressure drop and as such may require the size shown on this Guide be increased by 1 round size for up to 800 CFM and 2 round sizes above 800 CFM to insure proper airflow. Failure to do so will result in high velocity and very likely, loss of airflow. ACCA Manual D is the industry standard containing procedures used for designing Residential duct systems. You can obtain a copy directly from ACCA by visiting their website: Rectangular and Round DuctAir VolumeCFMDuct Height InchesEquivalent RoundDuct Air VolumeCFM4 6 8 10 12 506 x 4550756 x 46751008 x 46 x 6610012510 x 46 x 6712515010 x 48 x 6715017512 x 48 x 6817520014 x 48 x 6820022516 x 410 x 6822025016 x 410 x 6925027512 x 68 x 8927530012 x 68 x 8930040014 x 610 x 81040050018 x 612 x 810 x 101150060020 x 614 x 812 x 101260070024 x 616 x 812 x

Residential Duct Sizing Guide Key Points to Remember when using this guide • The sizing chart is designed for estimating the airflow in an “average” system. • The chart assumes the blower motor and total effective length of the duct system to be adequate for a .1 friction rate.

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Transcription of Residential Duct Sizing Guide - VirginiaAir

1 Residential Duct Sizing Guide Key Points to Remember when using this Guide The Sizing chart is designed for estimating the airflow in an average system. The chart assumes the blower motor and total effective length of the duct system to be adequate for a .1 friction rate. The chart should not be used to design complete duct systems. To insure proper distribution of air, volume dampers must be used for all branch runs. The chart is based on metal duct. Flex duct has a higher pressure drop and as such may require the size shown on this Guide be increased by 1 round size for up to 800 CFM and 2 round sizes above 800 CFM to insure proper airflow. Failure to do so will result in high velocity and very likely, loss of airflow. ACCA Manual D is the industry standard containing procedures used for designing Residential duct systems. You can obtain a copy directly from ACCA by visiting their website.

2 Rectangular and Round DuctAir VolumeCFMDuct Height InchesEquivalent RoundDuct Air VolumeCFM4 6 8 10 12 506 x 4550756 x 46751008 x 46 x 6610012510 x 46 x 6712515010 x 48 x 6715017512 x 48 x 6817520014 x 48 x 6820022516 x 410 x 6822025016 x 410 x 6925027512 x 68 x 8927530012 x 68 x 8930040014 x 610 x 81040050018 x 612 x 810 x 101150060020 x 614 x 812 x 101260070024 x 616 x 812 x 101270080026 x 618 x 814 x 1012 x 121380090030 x 620 x 816 x 1012 x 1214900100022 x 816 x 1014 x 12141000110024 x 818 x 1016 x 12151100120026 x 820 x 1016 x 12151200130028 x 820 x 1018 x 12161300140030 x 822 x 1018 x 12161400150024 x 1020 x 12161500160024 x 1020 x 12171600170026 x 1022 x 12171700180028 x 1022 x 12181800190030 x 1022 x 12181900200024 x 12182000 Residential Duct Sizing GuideThe following duct sizes are based on a friction rate of .10 inches per 100 feet of linealduct. This Equal-Friction method of duct Sizing should be adequate for normal residentialfurnace heating and air conditioning applications.

3 Larger air volumes or higher staticpressures should be dealt with on an individual job basis. See page 1 for details.


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