Standard Rectangular Duct Sizes

Duct work is otherwise called as duct system.

Standard rectangular duct sizes.

A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended. In order to maintain velocity reduce duct size. Menards offers a wide range of ductwork pipe and fittings to help your ductwork systems run efficiently these products are used for warm air return supply and exhaust systems. All ductwork comes standard with stiffening beads.

Wrap around duct l shape duct all sizes shall be listed using outside. They are as follows. Use insulated duct or duct board in unheated spaces. Never locate ducts at the end of the trunk line run.

The rectangular dimensions and the air flow volume are adapted to the equal friction loss. The hvac model that you re interested in should offer information regarding the maximum airflow per cubic foot per minute or cfm to help you determine adequate. Rectangular or square ducting comes in standard sizes ranging from 3 by 7 inches to 35 by 40 inches. In addition its flexibility allows for easier installation in hard to reach areas.

Sealant is available in the seams upon request. Master flow 14 in. The table below can be used to compare equivalent diameters for rectangular and round circular ducts. Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local hvac codes.

Half section rectangular duct model rd14x8x48. The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe. Provided here is the rectangular duct sizes chart for your personal reference and this chart table shows the duct size cfm and their equivalent diameter in inches. Flexible duct work must be stretched tightly for maximum air flow.

The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows. The master flow 36 in. For screen reader problems with this website please call 1 800 430 3376 or text 38698 standard carrier rates apply to. Galvanized steel flat sheet can be cut to size for a tough hvac job that requires a customized fitting.

Last take off run to be located 12 18 from end. Always stagger take off ducts by 12 to maintain pressure. Ductwork is fabricated with either snap lock or pittsburgh longitudinal seams. The table is based on the ducts friction loss formula.

Equivalent diameter rectangular and circular hvac ducts equivalent diameter for rectangular and circular ducts air flows between 100 50000 cfm maximum size of duct or pipe through steel joists k series joists and maximum size of ducts and pipes. Sizing is based on airflow needs per cubic foot per minute as well as velocity.