WTC Cleaning Recommendation Memo, 45 Wall Street, January 2003

NYC 9/11 Public Portal Document

VENTILATION SYSTEM EVALUATION FORM Part 1-0 General Information Date of Evaluation: 9-24-02 Report #1 Building contact name and phone: Walter Grzybonska/ (212) 269-3003 Boiler Room Sub-Cellar Evaluation Team (list name and affiliation): Claude Linton / Joy K. Kurin Environmental Professional: Cole Consultants HVAC Contractor: DJH MECHANICAL ASSOCIATES LTD. Sheet Metal Professional: Building Address: 45 Wall Street, New Type of Facility (check all that apply): York, NY 10005 El Residential Building Age: 45 Years ® Multi-use Distance from Ground Zero: Half Mile El Other (describe) Direction from Ground Zero: South East Number of residential units: N/A Number of floors: 29 +2(B) HVAC System Types (check all that apply) ❑ Unit ventilator (single residence unit) ❑ Wall/window AC unit (single residence unit) El Fan coil unit (single residence unit) ® Central ventilation system ❑ Heat pump unit (single residence unit) ❑ Passive shaft/duct ® Other (describe) Air Handler Diffuser No.1 HVAC Shut Down: System Didn't Shutdown Frequency of filter change-outs: Every Two months in Commercial Place Impacted by WTC dust: Location: Boiler Room System Cleaned: No. Yes Sub-Cellar Outside air intake accessible for inspection x Yes No (explain)

2.0 General Description Of HVAC System

No. of Air Intakes: - Three (3) Location of Air Intakes:- Exchange place

Floor Served: - Fresh air to all home office room at each Whether Intakes at Street Level:- yes floor No. of Rooftop Blower/Mushroom Vents: 15 Individual Heating / AC unit Present or not: - NA

General Description: - Two exhaust pumps in the basement, which serve 1St to 17th floor for kitchen and bathroom air out. Two Additional small exhaust pumps located on 18'h floor. They serve 18"' — 24th floors for bathrooms and kitchens air out. In addition, 15 mushroom fans on rooftop to serve 25th — 30th floors for kitchens and bathrooms air out. Enclosed please find pictures taken of the passive shaft/duct duct shaft and mushroom fans, which showed no signs of WTC dust debris.

3.0 Fan coil/ heat pump units in common spaces

Ventilation System Identification: Make: McQuay M#MSL117DH Serial No. 37B00582-04 Location: Boiler Room Sub-Cellar Access adequate for inspection of components: Yes A B C D E Dust/Dirt/Debris Suspect WTC-Related Dust System Component Color Heavy Present? Estimate % of total dust Substrate Material W- White (>_ 1/16 inch (Y/N) loading (sheet metal wrapped) B - Brown Light depth G - Grey (< 1/16 inch System Components (sheet metal lined) B - Black depth) (fiberglass) (flexible connector) double walled) Return air grille Sheet metal B& G 2 1/16 inch Yes 15%

Fresh Air Intake Grille Sheet Metal B, W, & G 2 1/16 inch

NYC-WTC-000133625