Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.
Standard rectangular duct sizes inches.
The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
Add standard and customized parametric components like flange beams lumbers piping stairs and more.
This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.
If we compare round duct to rectangular duct we see that.
Width mm height mm 100 150 200 250 300 400 500 600 800 1000.
Design cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670 18x8 930 18x10 1100.
The rectangular dimensions and the air flow volume are adapted to the equal friction loss.
Rectangular duct and fittings are one part of our complete line of hvac products.
Rectangular or square ducting comes in standard sizes ranging from 3 by 7 inches to 35 by 40 inches.
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.
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Round duct and rectangular duct comparison.
Here equivalent diameter of rectangular ducts are given from 60 to 3050.
The table is based on the ducts friction loss formula.
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.
Smc manufactures coil line ductwork in 4 5 6 lengths.
Larger volumes or higher static pressures should be dealt with on an individual.
Commonly used rectangular duct sizes in air handling ventilation systems.
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Rectangular duct sizes chart helps you to find the size of duct with its corresponding inches.
Sizing is based on airflow needs per cubic foot per minute as well as velocity.
All ductwork comes standard with stiffening beads.
