Flexible Duct Flex Duct Calculator

Equivalent round 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. Our easy to use duct calculator application allows hvac installers to determine the best flexible duct size recommended for their installation project. This calculator is intended for use with all quietflex flexible ducts. Use the online duct calculator see references and calculate the needed flex duct size.

Select the duct type on the pull down menu. 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. Click calculate and you will see the size of flex duct you need for that room. Input the required cfm in the box below that.

Based on friction loss. Rectangular duct is rounded up to the nearest 1 4 inch. The calculator assumes the duct is installed in the uncompressed condition. Enter friction loss inches of water duct airflow cfm duct length and the number of bends.

Flexible duct friction loss calculator 1. Based on friction loss. Maximum recommended supply velocity. Friction loss calculator for flexible ducts.

We have been using the thermaflex flex duct for over 10 years. When you size flexible ducts with a sheet metal duct calculator low airflow and high static pressure are sure to follow. These materials are two completely different surfaces. 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.

Flexible duct calculator contents. For installation instructions refer to the duct package. Other hart cooley mobile tools. Thermaflex is the global leader in the flexible duct product industry for both commercial and residential hvac applications.

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. Friction loss calculator for sheet metal 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. Equivalent duct calculator round vs rectangular.

Based on duct diameter.