Flexible Duct Flex Duct Calculator

Flexible duct calculator contents.

Flexible duct flex duct calculator.

Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft. Friction loss calculator for flexible ducts. This calculator is intended for use with all quietflex flexible ducts. Select the duct type on the pull down menu.

Click calculate and you will see the size of flex duct you need for that room. The calculator assumes the duct is installed in the uncompressed condition. Maximum recommended supply velocity. Rectangular duct is rounded up to the nearest 1 4 inch.

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. Friction loss calculator for sheet metal ducts. 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.

Based on duct diameter. We have been using the thermaflex flex duct for over 10 years. Use the online duct calculator see references and calculate the needed flex duct size. Our easy to use duct calculator application allows hvac installers to determine the best flexible duct size recommended for their installation project.

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. 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. Equivalent round duct diameter.

When you size flexible ducts with a sheet metal duct calculator low airflow and high static pressure are sure to follow. Thermaflex is the global leader in the flexible duct product industry for both commercial and residential hvac applications. Flexible duct friction loss calculator 1. Equivalent duct calculator round vs rectangular.

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

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.