Flexible Duct Flex Duct Calculator

Use the online duct calculator see references and calculate the needed flex duct size.

Flexible duct flex duct calculator. When you size flexible ducts with a sheet metal duct calculator low airflow and high static pressure are sure to follow. We have been using the thermaflex flex duct for over 10 years. Unless it s stated on the front of the duct calculator that it is specifically for use with flexible ducts it s probably intended for use with sheet metal. Input the required cfm in the box below that.

Maximum recommended supply velocity. Based on friction loss. These materials are two completely different surfaces. Other hart cooley mobile tools.

Select the duct type on the pull down menu. Thermaflex is the global leader in the flexible duct product industry for both commercial and residential hvac applications. Rectangular duct is rounded up to the nearest 1 4 inch. Equivalent duct calculator round vs rectangular.

If ashrae 2013 is selected flexible roughness is 0 003 ft when straight and fully stretched tight at 0 compression adjusted at other compressions otherwise the. Equivalent round duct diameter. Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft. Based on friction loss.

While this may be true in most cases for a metal supply air duct it is not for a metal return nor a 6 flexible duct on supply or return. Click calculate and you will see the size of flex duct you need for that room. Minimum friction loss will only be obtained when the duct is properly installed. Flexible duct friction loss calculator 1.

Flex duct 05 on most metal duct calculator round metal pipe 06 on most metal duct calculators field duct sizing chart rectangular sheet metal duct 07 on most metal duct calculators. Friction loss calculator for flexible ducts. Based on duct diameter. This calculator is intended for use with all quietflex flexible ducts.

Enter friction loss inches of water duct airflow cfm duct length and the number of bends. For installation instructions refer to the duct package. Our easy to use duct calculator application allows hvac installers to determine the best flexible duct size recommended for their installation project. Enter friction loss per 100 of duct inches of water duct airflow cfm duct length and the number of bends.

The calculator assumes the duct is installed in the uncompressed condition.