HVAC consulting services invoice, NYC WTC site, 2003

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E F +fit It kL Exkus7 Sr+ed: U QPE R fool+ - Q 3WTk Enm Associated. medianical raorr : clean Y N day~Y N stored chemicalsJxetllaa Y N surface Component system Cerro vents Dust! WTC s not present [NOTE: i ' consponenrt not ireeent (N?), not > (N?) or inacceesIble (.1) please Debris • nom i"Etcate In last column] Dust Exhaust air outlet: Locatio:

Able for inapecdon? r__'N ____l); Y — louvers, grates and/or a rem — outside air dace — outside air dampers) Exhaust fan unit: — blower assembly inci.1: lower wheel, Iwusing, air vanes, iu.L,o noise a 2enuatore — blower housing acousti al lining — vibration collars Exhaust air distribution: — Exhaust air ducts Est ota1 In ft t OO No. locations inspected OZ Specify type (circle): ( ) c slug liked me ,t x

—Accesaiblein.finere . mpers Esc total qty No. localiona inspected et — Accessible turning vanes Est. total qty No. locations inspected } — Bxlaaust air. grilles Est total qty No. lions inspected O Other (specie):

Other Yufmrraa#ioa:

General iimpression (tndlt:::e reeamne:adatjonsc for cleaning based on biding of Wit dust): &5' )A 'J ,a ?~kE -jfCs:f~A~J tC L ... \ V ,)9'f oc u p s,=1N'fS fiJ i'r5 AsSovA ' CoPo t7S.

FQ foR — l.. L A N t IJ ~ 1 .~ Asst Aojn its MECkAttCAL CbwPDuFNTS +E z a

KEY: NP not present; Pl'la' - not Sound; Z= InaccessIbIe; II unknown

NYC-WTC 000135372