A room air filter apparatus includes a multi sided housing having longitudinally spaced first and second ends, a plurality of {HEAD ~ sides} between {TAIL ~ the first and second ends}, and a plenum inside the housing 
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A room air filter apparatus includes a multi sided housing having longitudinally spaced first and second ends , a plurality of { HEAD ~ sides } between { TAIL ~ the first and second ends } , and a plenum inside the housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH