Hvac Oval Duct Sizing Chart

Use insulated duct or duct board in unheated spaces.

Hvac oval duct sizing chart.

Friction rate velocity friction rate. Convert rectangular duct to round equivalent. In wg duct tel. Flexible duct work must be stretched tightly for maximum air flow.

Never locate ducts at the end of the trunk line run. Diameter of duct x 3 14 return air duct in square inches. You can obtain these from ductwork manufacturers or from industry bodies such as cibse and ashrae. From the rough drawing we measure out the length of each duct section and enter this into the chart.

Flex duct 05 on most metal duct calculator round metal pipe 06 on most metal duct calculators 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. Size of air conditioner example. Algona wa 98001 ph. Always stagger take off ducts by 12 to maintain pressure.

Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less. A common duct pressure of 0 25 inches water column is equal to 0 25 divided by 27 7 in wc psi 0 009. 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. 4 ton unit x 144 square inches 576 squared.

Convert diameter to rectangular equivalent. Flat oval size chart flat oval specification flat oval nomenclature cheat sheet. Include fittings in the duct tel enter either. To size the ducts you re going to need a duct sizing chart.

The square root of 576 is 24. Click on the album below for hvac oval ductwork product listing and spec sheets. While this may be true in most cases for a metal supply air duct it is not for a metal return nor a 6 flexible duct on supply or return. Duct sizing how to size ductwork.

4 tons x 144 square inches return air duct in square inches. 1 psi equals 27 7 inches of water gauge. Ordering examples are provided for both single wall and double wall products at the bottom of each page. Click here for the complete flat oval catalog.

Last take off run to be located 12 18 from end. Linx flat oval ductwork and fittings.