00662nam a22001577a 450000500170000000800410001704000240005805000260008210000360010824500720014426000300021630000400024650000250028665000350031170001580034620230427152936.0230422b        |||||||| |||| 00| 0 eng d  6HSLRCaHSLRCcHSLRC  aTH 7683b A3 G87 2019  aGutierrez, John Christopher B.   aThe effectivity of improvised carbon air filter as an air purifier.  aMarikina CitycMarch 2019  avii, 38pages; billustration;c28cm  aIncludes: references  a1. Air filters -- Case studies  a Melody Jane M. Malig, Benjamin A. Guevara Jr., Maria Lou Isabella C. Juguilon, Karl Vincent Q. Siapno, Nakki Jules C. Urbano and Sean Andrea E. Ybañez