Clean Air Building Certificate

Space Type: BOS-School
Establishment Name: O Donnell Hugh Elem
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: Natural Ventilation
Min ACH: 3.1 Max ACH: 6.1 Avg ACH: 4.4 eACH: 0
Filter MERV:
Percent Outside Air: 100
ON and Ventilates Entire Indoor Area: Yes
Vent Clearance min 6 ft: Yes
No of Rooms: 6 sqft: 1318.1 cuft: 13181 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 107*. ACH Copy paste check (uses total or outside) 4.3. Window opening length (inches) 22. Window opening height (inches) 4. Co2 ambient (ppm) 425. Co2 test start (ppm) 1800. Co2 test end (ppm) 1094. Run time (min:sec) 10:00. Window air velocity max 792. Window air velocity min 340. Window air velocity avg 520. Window outside air volume (cfm) avg 318. Window cu-ft 0.61. Window cfm max 484. Window cfm min 208. Window cfm avg 318. wACH max 3.7. wACH min 1.6. wACH avg 2.4. wACH Copy paste check (does not match calcultated) 4.3.

Room 111*. ACH Copy paste check (uses total or outside) 4. Window opening length (inches) 22. Window opening height (inches) 4. Co2 ambient (ppm) 425. Co2 test start (ppm) 1770. Co2 test end (ppm) 1071. Run time (min:sec) 11:00. Window air velocity max 943. Window air velocity min 149. Window air velocity avg 379. Window outside air volume (cfm) avg 232. Window cu-ft 0.61. Window cfm max 576. Window cfm min 91. Window cfm avg 232. wACH max 4.6. wACH min 0.7. wACH avg 1.8. wACH Copy paste check (does not match calcultated) 4.

Room 202**. ACH Copy paste check (uses total or outside) 3.5. Window opening length (inches) 44. Window opening height (inches) 4. Co2 ambient (ppm) 396. Co2 test start (ppm) 2192. Co2 test end (ppm) 1336. Run time (min:sec) 11:00. Window air velocity max 398. Window air velocity min 51. Window air velocity avg 158. Window outside air volume (cfm) avg 193. Window cu-ft 1.22. Window cfm max 486. Window cfm min 62. Window cfm avg 193. wACH max 3.7. wACH min 0.5. wACH avg 1.5. wACH Copy paste check (does not match calcultated) 3.5.

Room 212**. ACH Copy paste check (uses total or outside) 6.1. Window opening length (inches) 44. Window opening height (inches) 4. Co2 ambient (ppm) 396. Co2 test start (ppm) 2631. Co2 test end (ppm) 1746. Run time (min:sec) 5:00. Window air velocity max 433. Window air velocity min 118. Window air velocity avg 248. Window outside air volume (cfm) avg 303. Window cu-ft 1.22. Window cfm max 529. Window cfm min 144. Window cfm avg 303. wACH max 3.9. wACH min 1.1. wACH avg 2.2. wACH Copy paste check (does not match calcultated) 6.1.

Room 205**. ACH Copy paste check (uses total or outside) 5.5. Window opening length (inches) 44. Window opening height (inches) 4. Co2 ambient (ppm) 396. Co2 test start (ppm) 2142. Co2 test end (ppm) 1158. Run time (min:sec) 9:00. Window air velocity max 394. Window air velocity min 70. Window air velocity avg 196. Window outside air volume (cfm) avg 240. Window cu-ft 1.22. Window cfm max 482. Window cfm min 86. Window cfm avg 240. wACH max 3.6. wACH min 0.6. wACH avg 1.8. wACH Copy paste check (does not match calcultated) 5.5.

Room 103. ACH Copy paste check (uses total or outside) 6.9. Window opening length (inches) 60. Window opening height (inches) 4. Co2 ambient (ppm) 396. Co2 test start (ppm) 2117. Co2 test end (ppm) 1254. Run time (min:sec) 6:00. Window air velocity max 876. Window air velocity min 266. Window air velocity avg 582. Window outside air volume (cfm) avg 970. Window cu-ft 1.67. Window cfm max 1460. Window cfm min 443. Window cfm avg 970. wACH max 6.6. wACH min 2.0. wACH avg 4.4. wACH Copy paste check (does not match calcultated) 6.9.

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.