Flexible Duct Flex Duct Calculator

Based on duct diameter.

Flexible duct flex duct calculator.

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. The calculator assumes the duct is installed in the uncompressed condition. Use the online duct calculator see references and calculate the needed flex duct size. 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.

These materials are two completely different surfaces. Based on friction loss. Input the required cfm in the box below that. Enter friction loss inches of water duct airflow cfm duct length and the number of bends.

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. Rectangular duct is rounded up to the nearest 1 4 inch. Friction loss calculator for flexible ducts.

Thermaflex is the global leader in the flexible duct product industry for both commercial and residential hvac applications. Equivalent round duct diameter. Select the duct type on the pull down menu. Flexible duct calculator contents.

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. For installation instructions refer to the duct package. Other hart cooley mobile tools. Enter friction loss per 100 of duct inches of water duct airflow cfm duct length and the number of bends.

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. This calculator is intended for use with all quietflex flexible ducts. Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft. Our easy to use duct calculator application allows hvac installers to determine the best flexible duct size recommended for their installation project.

Flexible duct friction loss calculator 1. Equivalent duct calculator round vs rectangular. Minimum friction loss will only be obtained when the duct is properly installed. Maximum recommended supply velocity.

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