Gutierrez, John Christopher B.  <br/><br/>
The effectivity of improvised carbon air filter as an air purifier. 

 - Marikina City  March 2019 
 - vii, 38pages;   illustration;  28cm 
<br/><br/> Includes: references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. Air filters -- Case studies
<br/><br/><label>LC Class. No.: </label>TH 7683  /  A3 G87 2019