Hvac Oval Duct Sizing 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.

Hvac oval duct sizing chart. Always stagger take off ducts by 12 to maintain pressure. 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. From the rough drawing we measure out the length of each duct section and enter this into the chart. Linx flat oval ductwork and fittings.

Convert rectangular duct to round equivalent. Step 4 calculate the square root of the total. Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less. You can obtain these from ductwork manufacturers or from industry bodies such as cibse and ashrae.

4 tons x 144 square inches return air duct in square inches. Convert diameter to rectangular equivalent. Duct system sizes and airflow quick chart created date. To size the ducts you re going to need a duct sizing chart.

Flat oval size chart flat oval specification flat oval nomenclature cheat sheet. Algona wa 98001 ph. Size of air conditioner example. 4 ton unit x 144 square inches 576 squared.

In order to maintain velocity reduce duct size. Friction rate velocity friction rate. Click on the album below for hvac oval ductwork product listing and spec sheets. A common duct pressure of 0 25 inches water column is equal to 0 25 divided by 27 7 in wc psi 0 009.

In wg duct tel. 1 psi equals 27 7 inches of water gauge. Use insulated duct or duct board in unheated spaces. Include fittings in the duct tel enter either.

Duct sizing how to size ductwork. 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. Diameter of duct x 3 14 return air duct in square inches. Click here for the complete flat oval catalog.

Flexible duct work must be stretched tightly for maximum air flow. Ordering examples are provided for both single wall and double wall products at the bottom of each page.