# Air flow calculator

**Air**

**Flow**

**Calculator**- Linear Bar Grilles. Use the

**calculator**below to quickly and easily determine the grille

**airflow**. Grille Length (inches) Grille Height (inches) Please fill in EITHER CFM (cubic feet per minute) value OR FPM (feet per minute) value. Known CFM (Calculate FPM based on known CFM).

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**flow**meter calculations in U.S. or S.I. units. Excel formulas use the ideal gas law to calculate the density of a gas for known gas molecular weight, temperature and pressure. This article contains three example Excel templates that can be downloaded. Each has built in Excel formulas to calculate unknowns like the pipe

**flow**. C. v. /

**Flow**

**calculator**for valves and regulators. This is our valve Cv

**calculator**. It allows you to

**calculate**the

**flow**or Cv (

**flow**coefficient) to make the relationship visible between the pressure drop (the difference in pressure between two points in a network transporting a liquid or gas) and the

**flow**rate..

**calculator**above, type the airflow value of 400 and select LFM as the units. Next type the circular duct dimensions of r = 2 in. After pressing the

**Calculate**Airflow button, read the CFM requirement.

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**air**pressure drop

**calculation**formula that can be used is expressed as: dp= 7.57q 1.85 L 10 4 / (a 5 p) Assuming: dp = pressure drop (kg/cm2) q =

**air**volume

**flow**at atmospheric conditions (FAD) (m3/min) L= length of pipe (m) d = inside diameter (mm) p = initial pressure – gauge (kg/cm2) Using this pressure loss

**calculation**formula, you ....

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**air**inlet and outlet, each with a minimum free area of opening calculated by the following formula: Area = 28 * Q [cm2] For the purpose of this

**calculation**the

**air**velocity is assumed to be >0,1 m/sec. Large and well ventilated rooms shall have a free volume of at least 2,5 * Q [m3].