Standard Rectangular Ductwork Sizes

In addition its flexibility allows for easier installation in hard to reach areas.

Standard rectangular ductwork sizes.

For technical drawings and 3 d models click on a part number. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. They are as follows.

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. The table is based on the ducts friction loss formula. 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. Ducts diameter and cross sectional area circular ducts and cross sectional areas.

It maintains the most efficient characteristics for airflow and is common throughout the country. Sealant is available in the seams upon request. 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. Rectangular or square ducting comes in standard sizes ranging from 3 by 7 inches to 35 by 40 inches.

The table below can be used to compare equivalent diameters for rectangular and round circular ducts. 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. Round pipe can be used as a main trunk line or branch line as well as in return air situations. Sizing is based on airflow needs per cubic foot per minute as well as velocity.

Wrap around duct l shape duct all sizes shall be listed using outside. Here equivalent diameter of rectangular ducts are given from 60 to 3050. All ductwork comes standard with stiffening beads. For 375 duct size the equivalent diameter inches will be about 16x6.

Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local hvac codes. Rectangular ductwork is manufactured in three different styles. The rectangular dimensions and the air flow volume are adapted to the equal friction loss. They are working with software providers to flag up non standard sizes in an attempt to minimise the use of non standard sizes.

Rectangular duct sizes chart helps you to find the size of duct with its corresponding inches. Larger volumes or higher static pressures should be dealt with on an individual job basis. Ductwork is fabricated with either snap lock or pittsburgh longitudinal seams. Duct and fittings have interconnecting ends that lock together with brackets.

Dimensions adcas is promoting the use of standard ductwork sizes. Often used in tight spaces such as in walls and ceilings rectangular duct allows you to select larger sizes without increasing duct height.