# Air Flow Rate through Piping

on . Posted in Fluid Dynamics

## Air Flow Rate through Piping formula

$$\large{ Q_a = 60 \; \pi \; v_a \; { \left( \frac {d}{24} \right) ^2 } }$$
Symbol English Metric
$$\large{ Q_a }$$ = air flow rate $$\large{\frac{ft^3}{sec}}$$ $$\large{\frac{m^3}{s}}$$
$$\large{ v_a }$$ = air velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$
$$\large{ \pi }$$ = Pi $$\large{3.141 592 653 ...}$$
$$\large{ d }$$ = pipe inside diameter $$\large{ in }$$ $$\large{ mm }$$