How to convert normalized liters per minute to liters per minute or CFM?

Good question. Check this out.

http://www.smartmeasurement.com/en/wizards/flowmeter/flmtr_cal_flowrate_A2N.asp

The actual (measured) flow rate is normalized to the flow rate at a
certain reference pressure (P) and temperature (T).

    For Metric system, the "normal" condition is 


Pref = 1 atm = 1.01325 bar = 101325 Pa


Tref = 0 °C = 273.15 k
    For Standard (English) system, the "standard" condition is 


Pref = 1 atm = 14.6959 psi


Tref = 70 °F = 529.67 °R
Ideal gas assumes that volume is proportional to temperature and the
reciprocal of pressure. The normalized volume flow rate becomes


QN = Q × (Pa / Pref) × (Tref / T)
where Pa, the actual pressure, is the sum of surrounding atmospheric
pressure and the gage pressure (Pa = Patm + Pg). The unit of flow
temperature T must be either Kelvin (k) or Rankine degrees (°R).