Central Ventilation System Assessment Form, WTC Dust, Oct 2001

NYC 9/11 Public Portal Document

2J Central ventilation systems (cont.)

Dust/Dirt/Debris I Suspect WTC-Related Dust Estimate % of total dust loading System Light Heavy Component (<1/16 inch 1/16 inch Present? System Components Substrate Material None depth) depth (Y/N) Outside air intake louvers, grates and/or screens Outside air duct Outside air damper(s) Return air grilles Return air plenum Return air plenum damper Return air ducts Turning vanes Mixing chambers Filter rack{s) Filter Pre-heat coils Cooling coils Re-heat coils Humidification and/or air cleaning equipment Fire dampers In-line re-heat coils Acoustical blower housing lining Duct connectors Blower assembly including blower wheel, blower housing, air vanes, in­ line noise attenuators, acoustical treatments (e.g. baffles, duct linings) Condensate drain pan Condensate accumulator Supply air plenum Supply air plenum damperfs) Supply air ducts -High pressure - main trunk -Low pressure - branches Supply plenum or supply duct linings Supply air duct damper(s) Supply air diffusers Terminal boxes Open or ducted passive ventilation shaft(s) Other Information:

I Unit cycled prior to inspection Color of Dust/Dirt/Debris________________________ Filter loading (general impression) Water damage ______________________________ Filter bypass (describe) Visible suspect mold growth_____________________ Abraded/delaminated acoustical lining Evidence of animal incursion (carcasses, feathers, fecal matter)

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