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: 9-30-02 Report #1 Building contact name and phone: Walter Grzybonska/ (212) 269-3003 4th Floor Hallway Evaluation Team (list name and affiliation): Claude Linton / Joy K. Kurin Environmental Professional: Cole Consulting Inc. 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 ❑ Residential Building Age: 45 Years ® Multi-use Distance from Ground Zero: Half Mile ❑ Other (describe) Direction from Ground Zero: South East Number of residential units: NIC 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) LI Fan coil unit (single residence unit) LI Central ventilation system ® Heat pump unit (single residence unit) LI Passive shaft/duct This pump supplying heat and cool to the room. HVAC Shut Down: System Didn't Shutdown Frequency of filter change-outs: Every Two months in Commercial Place I Impacted by WTC dust: No Location: 4'h Floor Hallway System Cleaned: No. Outside air intake accessible Yes x No (explain) There is no fresh intakes.

2.0 General Description Of HVAC System

No. Of Air Intakes: - 0 (No Fresh air intakes) Location of Air Intakes: - N/A

Floor Served: - N/A Whether Intakes at Street Level: -N/A No. Of Rooftop Blower/Mushroom Vents: 15 General Description: -N/A Individual Heating / AC unit Present or not: - YES

General Description: Two exhaust pumps in the basement, which serve 15` to 17th floor for kitchen and bathroom air out. Two additional small exhaust pumps located on 18th floor. They serve 18"' — 24"' floors for bathrooms and kitchens air out. 11 In addition, 15 mushroom fans on rooftop to serve 25`h — 30 ' floors for kitchens and bathrooms air out. Enclosed please find pictures taken of the passive shaft/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#FCV036BMGR Serial No. 77AO4558-03 Location: 4`h Floor Closet Serve: - Serving heat and cool air toCoridor. Access adequate for inspection of components: Yes A B C D Suspect WTC-Related Dust Dust/Dirt/Debris System Component Color Light Heavy Present Estimate % of total Substrate Material W- White (< 1/16 (>_ 1/16 inch depth ? (Y/N) dust loading (sheet metal wrapped) B - Brown inch depth) G - Grey System Components (sheet metal lined) B - Black (fiberglass) (flexible connector) (double walled) Return air grille Sheet Metal B& G < 1/16 inch No -------

NYC-WTC 000133543