Standard Rectangular Ductwork Sizes

Sealant is available in the seams upon request.

Standard rectangular ductwork sizes.

The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. Rectangular duct sizes chart helps you to find the size of duct with its corresponding inches. Duct and fittings have interconnecting ends that lock together with brackets. Ducts diameter and cross sectional area circular ducts and cross sectional areas.

The table is based on the ducts friction loss formula. The rectangular dimensions and the air flow volume are adapted to the equal friction loss. Ductwork is fabricated with either snap lock or pittsburgh longitudinal seams. In addition its flexibility allows for easier installation in hard to reach areas.

Responding to the newly published bs en 1506 2007 sheet metal air ducts and fittings with circular cross section. Duct sizing equal friction method the equal friction method for sizing air ducts is easy and straightforward to use. Here equivalent diameter of rectangular ducts are given from 60 to 3050. Larger volumes or higher static pressures should be dealt with on an individual job basis.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Wrap around duct l shape duct all sizes shall be listed using outside. 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. Sizing is based on airflow needs per cubic foot per minute as well as velocity.

For 375 duct size the equivalent diameter inches will be about 16x6. Rectangular or square ducting comes in standard sizes ranging from 3 by 7 inches to 35 by 40 inches. Round pipe can be used as a main trunk line or branch line as well as in return air situations. Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local hvac codes.

They are working with software providers to flag up non standard sizes in an attempt to minimise the use of non standard sizes. 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. They are as follows. All ductwork comes standard with stiffening beads.

Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Master flow metal pipe is available in a master flow metal pipe is available in a variety of common lengths diameters and gauges to help make your next hvac project a success. 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. The table below can be used to compare equivalent diameters for rectangular and round circular ducts.

Often used in tight spaces such as in walls and ceilings rectangular duct allows you to select larger sizes without increasing duct height. It maintains the most efficient characteristics for airflow and is common throughout the country.