Clean Air Building Certificate

Space Type: BOS-School
Establishment Name: Snowden International
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: 8.4 Max ACH: 25.6 Avg ACH: 12.3 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: 812.1 cuft: 8121 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 B-2. ACH Copy paste check (uses total or outside) 12.2. Window opening length (inches) 53. Window opening height (inches) 4. Co2 ambient (ppm) 556. Co2 test start (ppm) 1802. Co2 test end (ppm) 1009. Run time (min:sec) 5:00. Window air velocity max 605. Window air velocity min 402. Window air velocity avg 491. Window outside air volume (cfm) avg 723. Window cu-ft 1.47. Window cfm max 891. Window cfm min 592. Window cfm avg 723. wACH max 9.3. wACH min 6.2. wACH avg 7.5. wACH Copy paste check (does not match calcultated) 12.2.

Room 204. ACH Copy paste check (uses total or outside) 9.1. Window opening length (inches) 45. Window opening height (inches) 4. Co2 ambient (ppm) 400. Co2 test start (ppm) 2260. Co2 test end (ppm) 1412. Run time (min:sec) 4:00. Window air velocity max 662. Window air velocity min 161. Window air velocity avg 407. Window outside air volume (cfm) avg 509. Window cu-ft 1.25. Window cfm max 828. Window cfm min 201. Window cfm avg 509. wACH max 8.7. wACH min 2.1. wACH avg 5.3. wACH Copy paste check (does not match calcultated) 9.1.

Room 201. ACH Copy paste check (uses total or outside) 8.4. Window opening length (inches) 45. Window opening height (inches) 4. Co2 ambient (ppm) 400. Co2 test start (ppm) 2060. Co2 test end (ppm) 1226. Run time (min:sec) 5:00. Window air velocity max 903. Window air velocity min 283. Window air velocity avg 709. Window outside air volume (cfm) avg 886. Window cu-ft 1.25. Window cfm max 1129. Window cfm min 354. Window cfm avg 886. wACH max 11.4. wACH min 3.6. wACH avg 8.9. wACH Copy paste check (does not match calcultated) 8.4.

Room 101. ACH Copy paste check (uses total or outside) 9.5. Window opening length (inches) 54. Window opening height (inches) 4. Co2 ambient (ppm) 404. Co2 test start (ppm) 2078. Co2 test end (ppm) 1147. Run time (min:sec) 5:00. Window air velocity max 1333. Window air velocity min 891. Window air velocity avg 954. Window outside air volume (cfm) avg 1431. Window cu-ft 1.50. Window cfm max 2000. Window cfm min 1337. Window cfm avg 1431. wACH max 14.3. wACH min 9.5. wACH avg 10.2. wACH Copy paste check (does not match calcultated) 9.5.

Room 304. ACH Copy paste check (uses total or outside) 9.2. Window opening length (inches) 34. Window opening height (inches) 4. Co2 ambient (ppm) 404. Co2 test start (ppm) 2420. Co2 test end (ppm) 1205. Run time (min:sec) 6:00. Window air velocity max 1662. Window air velocity min 756. Window air velocity avg 841. Window outside air volume (cfm) avg 794. Window cu-ft 0.94. Window cfm max 1570. Window cfm min 714. Window cfm avg 794. wACH max 21.6. wACH min 9.8. wACH avg 10.9. wACH Copy paste check (does not match calcultated) 9.2.

Room 101. ACH Copy paste check (uses total or outside) 10.5. Window opening length (inches) 52. Window opening height (inches) 4. Co2 ambient (ppm) 396. Co2 test start (ppm) 2105. Co2 test end (ppm) 1108. Run time (min:sec) 5:00. Window air velocity max 332. Window air velocity min 220. Window air velocity avg 332. Window outside air volume (cfm) avg 480. Window cu-ft 1.44. Window cfm max 480. Window cfm min 318. Window cfm avg 480. wACH max 3.5. wACH min 2.3. wACH avg 3.5. wACH Copy paste check (does not match calcultated) 10.5.

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.