Standard Rectangular Duct Sizes Inches

Sizing is based on airflow needs per cubic foot per minute as well as velocity.

Standard rectangular duct sizes inches.

Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less. Duct system sizes and airflow quick chart created date. Add standard and customized parametric components like flange beams lumbers piping stairs and more. Larger volumes or higher static pressures should be dealt with on an individual.

Smc tdc slip drive and raw sheet metal connectors inc. 140 0 063 4 x 8. Rectangular duct sizes chart helps you to find the size of duct with its corresponding inches. Rectangular duct and fittings are one part of our complete line of hvac products.

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. For 375 duct size the equivalent diameter inches will be about 16x6. 120 0 05 4 x 7 5 x 6. Width mm height mm 100 150 200 250 300 400 500 600 800 1000.

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. Most technicians are skeptical about these numbers especially on the return air side of the system. 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. Commonly used rectangular duct sizes in air handling ventilation systems.

1 psi equals 27 7 inches of water gauge. Here equivalent diameter of rectangular ducts are given from 60 to 3050. Smc manufactures coil line ductwork in 4 5 6 lengths. Sheet metal connectors inc.

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. Duct system is pressurized by three pressures. All ductwork comes standard with stiffening beads. 100 0 045 4 x 6.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.