Asbestos Air Fiber Analysis Report, Nov 2001

NYC 9/11 Public Portal Document ta ,r Z3 A Central ~entilatiori systems (cOAt- TACHhxENT.A=SCOPE OF WORK

Dust/Dirt/Debris L Suspect WTC•Related Dust Estimate % •of total dust ( •' Y System loading Light Heavy Component '(<1/16 inch (2 1/ltsi inch Present? System. Components Substrate Material None , depth) depth (YIN) Outside air intake louvers, grates and/or screens Outside air duct` Outside air•damper(s) x Return air grilles Retu'tn air'plenum . Return air plenum damper Return air•ducts 'Turning vanes

Mixing chambers . Filter rack(s) .: { Filter banks/media V V - . . ..

Pre-heat coils V

Cooling coils X. VV V V V _ . Re-heat coils : • ' - V V V

Humidification -and%orair'cicaning - - • equipment Fire dampers • I _ In-line re-heat coils. . Acoustical blolr'er housing -lining . Duct connectors Blower assembly including blower • • wheel, blower housing, air vanes, in- _. . line noise attenuators, acoustical - treatment; (e.g. baffles, duct linings) . Condensate drain pan Condensate•accumulator .Supply 'air plenum Supply airplenum damper(s) Supply air ducts -High pressure -main trunk - -Low• pressure— branches • Supply plenum or supply duct • • ' • linings ~ V.

Supply air duct damper(s) .. Supply air diffusers V V - Terminal -boxes• •, Open or ducted passive ventilation shah(s) Other Information: Unit cycled prior to inspection : Color ofDust/Dirt/Debris ❑ Filter loading (general impression) Water damage o Filter bypass (describe) - 0 Visible suspect mold growth Abraded/dela;hinated acoustical lining 0 Evidence of animal incursion (carcasses, feathers, fecal matter) '

NYC-WTC 000132700