Air scrubber clearance calculator

1 How do I calculate the Clearance '(Effectiveness)' of air de-contamination after a Fallow Period given the Number of Air Changes per Hour?

       Num air changes per hour:       

       Fallow Period[mins]:      

           Clearance[%]:     

        

 
2 How do I calculate the total Number of Air Changes per Hour for a given Clearance and Fallow Period?

       Required Clearance[%]:    

       Required Fallow Period[mins]:     

           Num air changes per hour:       

 

 
3 How do I calculate the Equivalent Num of Air Changes per Hour of an Air Scrubber given the device's Flow Rate and the Room Dimensions?

       Room Height[m]:

       Room Length 1[m]: 

       Room Length2[m]:

       Air Scrubber Flow Rate[cubic m per hour):    

           Equivalent Num of Air Changes per Hour:       

        Simple Air Scrubber Calculator assuming 'good mixing' and 1st order kinetics. Pls note: this code is not bombproof: MatLab code available.  Tony Fisher Liverpool 26:xi:2020

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