Clean Air Building Certificate

Space Type: BOS-School
Establishment Name: Ohrenberger William School
Address: address
City: Boston
State / Province: MA
Country: USA
Date: 03/21/2021
Data Source: School District
Performed by: External Company
Company Name Address Contact: Cashins & Associates, Inc. 599 North Ave #8, Wakefield, MA 01880
Requirement Source: Boston School 3 ACH guideline

Technology: Univent Central HVAC
Min ACH: 2.1 Max ACH: 3.7 Avg ACH: 2.7 eACH: 0
Filter MERV:
Percent Outside Air: 60.3
ON and Ventilates Entire Indoor Area: Yes
Vent Clearance min 6 ft: Yes
No of Rooms: 6 sqft: 869.4 cuft: 8694 No of Buildings: 1

Comments: Source Boston School District March 18, 2021. https://www.bostonpublicschools.org/Page/8463 . https://drive.google.com/file/d/1bzam7XeMQDjjv7Og_86PS41K78hBEOfT/view . assumed 10ft ceiling. wACH windows provided in dataset. Calculated wACH from measured CFM rates in dataset do not match. Differences due to errors. Did not use calculated wACH.

Room 101. % Outside air 49. Calculated air volume (cfm) outside 262. Calculated air volume (cfm) return 275. Combined air volume (cfm) 537. ACH outside 1.5. ACH merv filter return air 1.5. ACH total 3.0. ACH Copy paste check (uses total or outside) 1.4.

Room 118. % Outside air 64. Calculated air volume (cfm) outside 395. Calculated air volume (cfm) return 220. Combined air volume (cfm) 615. ACH outside 1.6. ACH merv filter return air 0.9. ACH total 2.5. ACH Copy paste check (uses total or outside) 1.6.

Room 214. % Outside air 66. Calculated air volume (cfm) outside 278. Calculated air volume (cfm) return 142. Combined air volume (cfm) 420. ACH outside 1.5. ACH merv filter return air 0.8. ACH total 2.3. ACH Copy paste check (uses total or outside) 1.5.

Room 201. % Outside air 56. Calculated air volume (cfm) outside 225. Calculated air volume (cfm) return 175. Combined air volume (cfm) 400. ACH outside 1.2. ACH merv filter return air 0.9. ACH total 2.1. ACH Copy paste check (uses total or outside) 1.2.

Room 236. % Outside air 48. Calculated air volume (cfm) outside 263. Calculated air volume (cfm) return 289. Combined air volume (cfm) 552. ACH outside 1.4. ACH merv filter return air 1.5. ACH total 2.9. ACH Copy paste check (uses total or outside) 1.4.

Room 200. % Outside air 62. Calculated air volume (cfm) outside 687. Calculated air volume (cfm) return 425. Combined air volume (cfm) 1112. ACH outside 4.7. ACH merv filter return air 2.9. ACH total 7.7. ACH Copy paste check (uses total or outside) 4.7.

In the wake of the COVID-19 disaster many are calling for a paradigm shift in how citizens and government officials think about the quality of the air we breathe indoors. This Clean Air Certificate lets you know that those who operate this building are thinking about the air that we breathe in this building. They have disclosed the ventilation performance of this building so that we all become educated and we never have another indoor infection disaster again.