HVAC consulting services invoice, NYC WTC site, 2003

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Mechanical Exhaust System Identification A 2J Location: Area Served:

Associated mechanical room: clean+ EY N dryyY stored chemicals/refuse N Y N Surface Component System Components f Dust! WTC • not present Debris Dust . not found [NOTE: if component not present (NP), not found (NF) or inaccessible (1) please I Present? Present? • inn Indicate In last column} lble Exhaust air outlet: Location:

Accessible for inspection? Y___N (explain):

— louvers, grates and/or screens — outside air dud — outside air damper(s) Exhaust fan unit: — blower assembly incl. blower wheel, housing, air vanes, in-line noise attenuators — blower housing acoustical lining — vibration collars Exhaust air distribution: — Exhaust air ducts Est total In ft too No. locations inspected 02 Specify type (circle): t Quo s Blass glass board flex-duct y — Accessible in-line fire dampers Est. total qty 9 No. locations inspected U — Accessible turning vanes Est. total qty No. locations inspected NP — Exhaust air grilles Est. total qty No. locations inspected O Other (specify):

Other Information:

General impression (indicate recommendations for cleaning based on finding of Wit dust): l C.A L COMPe J - S -- WT C £u1 VVA$ 0'B S &&MELD IN T+fE 1'41 FcHAN AND° rrs 8,S5vctA' -r ,e

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KEY: NP - not present; NF = not found; I - inaccessible; U = unknown

NYC-WTC 000135385