žBOBOZЎDdHHHHHHаZЈшџџHZК4 џџX}hџџџ-Zџџџ Fred TepferxHHф>џёџ№ T-(ќ,, Xd'fџФџН Ї ГџџZЋ†l /Рj~бZT[ax[aи~jZ‡`YL Yч”[фџџџџџџџџp3§ЌDSETT@PЁ'YыZ›DZ­ьZЎ дˆ[aD'"8,e“Йя№љ&A]f­АН№![\qЋзјљAk„П (efvˆ    H[a<HZZКŒHINDOOR AIR QUALITY Why a modern problem? Sealed buildings with controlled, metered HVAC systems. 1970еs buildings with inadequate outside air 1960еs and 1970еs windowless schools most buildings with IAQ problems have fixed windows Sources: Building materials (usually VOCs) carpet floor tile & sheet vinyl floor and other adhesives paints particle board (and cabinets, underlayment, etc), formaldehyde glues Molds, etc. from HVAC equipment, often condensate pans of AC duct insulation that has gotten wet previously roof insulation and other elements thZat have gotten wet Outside air sources OSA intakes at loading areas, exhaust fan outlets, etc. Nearby pollution sources (factories or ?) General regional air pollution Solutions: 1. Ensure adequate OSA: check plans, check equipment, etc. 2. If construction is recent or underway - ventilate separately - consider flush-out and bake-out approaches (with care) 3. Investigate former or current leaks, HVAC equipment, and other sources 4. Check outside air source. 5. Check filtration levels, but watch out - no easy answer Sheldon example East Wing example Science Library example ZџџNдDSET‚џџ.HџџџџџџZКдˆШр˜ˆдџџ6џџ*Шр˜DSET‚џџ.HѕЫџџџџџџX}0˜ˆдџџ6џџ*Шр˜FNTMCUTSDSUM$ Fred TepferHDNISTYLd џџ@STYLZ[dЈZЎZ(ZЙИ[aLZtZЎ$cџџџџџџ1 џџџџџџџџџџџџџџџџ џџџџ) џџџџ џџџџ џџџџџџџџ( џџџџџџ џџџџF џџHASHŒ $ксДоу&  & L: QhЙбкj­зazЋсo}BodЪ  CHARZЙФ2џџџџ џџ џџџњ џџџыџџ"џп џџџћ џџ€џџџџџџџў џџџџ :џџHASH„   Rџџ CELLZЎ(&џџџџџџџџ"џџHASHџ ^џџ GRPHZЎPўџџџџџџџџ"џџHASHЦџџl RULRZК|vџџџџџџџџ§@џџ(џџHASHџџ@§( LKUP џџ  џџ$NAMEDefault Default SSHeaderBodyFooterFootnoteFootnote Index DFNTM HelveticaGenevaџџCharcoalPalatinoETBL@FNTM јCUTS DSUM HDNI 4STYL >ETBLfџў§ќћњљј№ёђѓєѕії