Hvac Oval Duct Sizing Chart

Duct system sizes and airflow quick chart created date.

Hvac oval duct sizing chart. Duct sizing how to size ductwork. Use insulated duct or duct board in unheated spaces. Size of air conditioner example. Flat oval size chart flat oval specification flat oval nomenclature cheat sheet.

You can obtain these from ductwork manufacturers or from industry bodies such as cibse and ashrae. Diameter of duct x 3 14 return air duct in square inches. From the rough drawing we measure out the length of each duct section and enter this into the chart. Convert diameter to rectangular equivalent.

Last take off run to be located 12 18 from end. Friction rate velocity friction rate. To size the ducts you re going to need a duct sizing chart. Never locate ducts at the end of the trunk line run.

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. Ordering examples are provided for both single wall and double wall products at the bottom of each page. In order to maintain velocity reduce duct size. The square root of 576 is 24.

Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less. In wg duct tel. A common duct pressure of 0 25 inches water column is equal to 0 25 divided by 27 7 in wc psi 0 009. Step 4 calculate the square root of the total.

4 ton unit x 144 square inches 576 squared. Linx flat oval ductwork and fittings. Flexible duct work must be stretched tightly for maximum air flow. Always stagger take off ducts by 12 to maintain pressure.

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. Include fittings in the duct tel enter either. Algona wa 98001 ph. Convert rectangular duct to round equivalent.

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. Click on the album below for hvac oval ductwork product listing and spec sheets.