Standard Rectangular Duct Sizes Inches

Here equivalent diameter of rectangular ducts are given from 60 to 3050.

Standard rectangular duct sizes inches. Sizing is based on airflow needs per cubic foot per minute as well as velocity. All ductwork comes standard with stiffening beads. Add standard and customized parametric components like flange beams lumbers piping stairs and more. Commonly used rectangular duct sizes in air handling ventilation systems.

Width mm height mm 100 150 200 250 300 400 500 600 800 1000. Most technicians are skeptical about these numbers especially on the return air side of the system. 100 0 045 4 x 6. Smc tdc slip drive and raw sheet metal connectors inc.

1 psi equals 27 7 inches of water gauge. Larger volumes or higher static pressures should be dealt with on an individual. Rectangular duct sizes inches mm x mm equivalent diameter round duct sizes d e inches mm velocity in equivalent round duct v ft min m s friction loss inh 2 o 100 ft duct pa 100m x x 80 0 04 3 x 7 4 x 5. Rectangular duct sizes chart helps you to find the size of duct with its corresponding inches.

Rectangular or square ducting comes in standard sizes ranging from 3 by 7 inches to 35 by 40 inches. Rectangular duct and fittings are one part of our complete line of hvac products. A common duct pressure of 0 25 inches water column is equal to 0 25 divided by 27 7 in wc psi 0 009 psi. Duct system sizes and airflow quick chart created date.

Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. Sheet metal connectors inc. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. 120 0 05 4 x 7 5 x 6.

Duct system is pressurized by three pressures. Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less. Rectangular single wall duct ductwork fittings. While a duct sizing calculator built for a specific type of ductwork is the best possible method for sizing ducts the attached chart can be used in most single story homes with a centrally located unit and reasonable length duct runs.

Field duct sizing chart rectangular sheet metal duct 07 on most metal duct calculators duct size duct height net inside dimension in inches round duct size estimate rectangular duct size estimate 14 5 6 7 8 16 18 20 design airflow 50 75 110 9 10 12 1300 1700 160 225 300 480 700 1000 duct size 5 6 7 8 18 20 9 10 12 flexible duct round metal pipe 750 1200 14 16.