Clean Air Building Certificate

Space Type: BOS-School
Establishment Name: Mason Samuel 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: 4.7 Max ACH: 9.8 Avg ACH: 7.2 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: 802.6 cuft: 8026 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 206. ACH Copy paste check (uses total or outside) 5.1. Window opening length (inches) 48. Window opening height (inches) 4. Co2 ambient (ppm) 413. Co2 test start (ppm) 1931. Co2 test end (ppm) 1067. Run time (min:sec) 10:00. Window air velocity max 822. Window air velocity min 67. Window air velocity avg 378. Window outside air volume (cfm) avg 504. Window cu-ft 1.33. Window cfm max 1096. Window cfm min 89. Window cfm avg 504. wACH max 7.1. wACH min 0.6. wACH avg 3.2. wACH Copy paste check (does not match calcultated) 5.1.

Room 207B. ACH Copy paste check (uses total or outside) 8.5. Window opening length (inches) 46. Window opening height (inches) 4. Co2 ambient (ppm) 430. Co2 test start (ppm) 2300. Co2 test end (ppm) 1490. Run time (min:sec) 4:00. Window air velocity max 586. Window air velocity min 132. Window air velocity avg 427. Window outside air volume (cfm) avg 546. Window cu-ft 1.28. Window cfm max 749. Window cfm min 169. Window cfm avg 546. wACH max 10.1. wACH min 2.3. wACH avg 7.3. wACH Copy paste check (does not match calcultated) 8.5.

Room 207A. ACH Copy paste check (uses total or outside) 8.7. Window opening length (inches) 46. Window opening height (inches) 4. Co2 ambient (ppm) 430. Co2 test start (ppm) 2300. Co2 test end (ppm) 1475. Run time (min:sec) 4:00. Window air velocity max 768. Window air velocity min 257. Window air velocity avg 470. Window outside air volume (cfm) avg 601. Window cu-ft 1.28. Window cfm max 981. Window cfm min 328. Window cfm avg 601. wACH max 12.8. wACH min 4.3. wACH avg 7.8. wACH Copy paste check (does not match calcultated) 8.7.

Room 312. ACH Copy paste check (uses total or outside) 4.7. Window opening length (inches) 48. Window opening height (inches) 4. Co2 ambient (ppm) 412. Co2 test start (ppm) 2131. Co2 test end (ppm) 1328. Run time (min:sec) 8:00. Window air velocity max 475. Window air velocity min 75. Window air velocity avg 261. Window outside air volume (cfm) avg 348. Window cu-ft 1.33. Window cfm max 633. Window cfm min 100. Window cfm avg 348. wACH max 5.3. wACH min 0.8. wACH avg 2.9. wACH Copy paste check (does not match calcultated) 4.7.

Room 208. ACH Copy paste check (uses total or outside) 9.8. Window opening length (inches) 48. Window opening height (inches) 4. Co2 ambient (ppm) 412. Co2 test start (ppm) 2022. Co2 test end (ppm) 1125. Run time (min:sec) 5:00. Window air velocity max 719. Window air velocity min 222. Window air velocity avg 548. Window outside air volume (cfm) avg 731. Window cu-ft 1.33. Window cfm max 959. Window cfm min 296. Window cfm avg 731. wACH max 5.4. wACH min 1.7. wACH avg 4.1. wACH Copy paste check (does not match calcultated) 9.8.

Room 17. ACH Copy paste check (uses total or outside) 8.1. Window opening length (inches) 52. Window opening height (inches) 4. Co2 ambient (ppm) 430. Co2 test start (ppm) 2105. Co2 test end (ppm) 1280. Run time (min:sec) 5:00. Window air velocity max 197. Window air velocity min 17. Window air velocity avg 99. Window outside air volume (cfm) avg 143. Window cu-ft 1.44. Window cfm max 285. Window cfm min 25. Window cfm avg 143. wACH max 2.1. wACH min 0.2. wACH avg 1.1. wACH Copy paste check (does not match calcultated) 8.1.

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.