1 Mbar=100Pa
10 Pa=1 mm of wc
so
1 Mbar=10mmof wc=100Pa
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Static Pressure 20 mm WC means the pressure which can sustain 20 mm high water column.
10m (10,000 mm) of water column is about 0.98 bar (P=density*specific gravity*height=1000*9.8*10) 5000 mm WC is 0.49 bar then.
Multiply inches of WC by 0.0361 to obtain PSI.
A "water closet (WC)", "loo" or "toilet". It is where you go to have a poo or pee.
Take width x Height of the plenum, Calculate Equivalent Diameter, Then for the specified air flow rate, Find the Static loss factor( feet / 100 feet of WC). then Calculate Friction Head ie,((Feet/100 ft of WC x Length of the plenum)/100)