Flexible Duct Flex Duct Calculator

Click calculate and you will see the size of flex duct you need for that room.

Flexible duct flex duct calculator.

Rectangular duct is rounded up to the nearest 1 4 inch. Select the duct type on the pull down menu. Based on friction loss. The calculator assumes the duct is installed in the uncompressed condition.

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. For installation instructions refer to the duct package. This calculator is intended for use with all quietflex flexible ducts. Minimum friction loss will only be obtained when the duct is properly installed.

Based on friction loss. Our easy to use duct calculator application allows hvac installers to determine the best flexible duct size recommended for their installation project. Friction loss calculator for sheet metal ducts. Equivalent duct calculator round vs rectangular.

Flexible duct friction loss calculator 1. Equivalent round duct diameter. Friction loss calculator for flexible ducts. Enter friction loss inches of water duct airflow cfm duct length and the number of bends.

Maximum recommended supply velocity. Flexible duct calculator contents. Thermaflex is the global leader in the flexible duct product industry for both commercial and residential hvac applications. These materials are two completely different surfaces.

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. While a duct sizing calculator built for a specific type of ductwork is the best possible method for sizing ducts the attached chart can be used in most single story homes with a centrally located. Enter friction loss per 100 of duct inches of water duct airflow cfm duct length and the number of bends. Use the online duct calculator see references and calculate the needed flex duct size.

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. Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft. 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.

When you size flexible ducts with a sheet metal duct calculator low airflow and high static pressure are sure to follow.