Clean Air Building Certificate

Space Type: BOS-School
Establishment Name: Holmes Oliver Wendell
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: 3.8 Max ACH: 23 Avg ACH: 10.7 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: 926.8 cuft: 9268 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 1. ACH Copy paste check (uses total or outside) 23. Window opening length (inches) 47. Window opening height (inches) 4. Co2 ambient (ppm) 401. Co2 test start (ppm) 2000. Co2 test end (ppm) 1139. Run time (min:sec) 2:00. Window air velocity max 732. Window air velocity min 696. Window air velocity avg 714. Window outside air volume (cfm) avg 932. Window cu-ft 1.31. Window cfm max 956. Window cfm min 909. Window cfm avg 932. wACH max 18.7. wACH min 17.8. wACH avg 18.2. wACH Copy paste check (does not match calcultated) 23.

Room 304. ACH Copy paste check (uses total or outside) 3.8. Window opening length (inches) 48. Window opening height (inches) 4. Co2 ambient (ppm) 443. Co2 test start (ppm) 1969. Co2 test end (ppm) 1207. Run time (min:sec) 11:00. Window air velocity max 485. Window air velocity min 63. Window air velocity avg 288. Window outside air volume (cfm) avg 384. Window cu-ft 1.33. Window cfm max 647. Window cfm min 84. Window cfm avg 384. wACH max 4.0. wACH min 0.5. wACH avg 2.4. wACH Copy paste check (does not match calcultated) 3.8.

Room 301. ACH Copy paste check (uses total or outside) 4.5. Window opening length (inches) 48. Window opening height (inches) 4. Co2 ambient (ppm) 443. Co2 test start (ppm) 2010. Co2 test end (ppm) 1247. Run time (min:sec) 9:00. Window air velocity max 464. Window air velocity min 46. Window air velocity avg 237. Window outside air volume (cfm) avg 316. Window cu-ft 1.33. Window cfm max 619. Window cfm min 61. Window cfm avg 316. wACH max 3.3. wACH min 0.3. wACH avg 1.7. wACH Copy paste check (does not match calcultated) 4.5.

Room 2. ACH Copy paste check (uses total or outside) 7.9. Window opening length (inches) 47. Window opening height (inches) 4. Co2 ambient (ppm) 380. Co2 test start (ppm) 2135. Co2 test end (ppm) 1290. Run time (min:sec) 5:00. Window air velocity max 549. Window air velocity min 532. Window air velocity avg 540. Window outside air volume (cfm) avg 705. Window cu-ft 1.31. Window cfm max 717. Window cfm min 695. Window cfm avg 705. wACH max 3.8. wACH min 3.6. wACH avg 3.7. wACH Copy paste check (does not match calcultated) 7.9.

Room 4. ACH Copy paste check (uses total or outside) 19.5. Window opening length (inches) 47. Window opening height (inches) 4. Co2 ambient (ppm) 380. Co2 test start (ppm) 2200. Co2 test end (ppm) 1330. Run time (min:sec) 2:00. Window air velocity max 732. Window air velocity min 696. Window air velocity avg 714. Window outside air volume (cfm) avg 932. Window cu-ft 1.31. Window cfm max 956. Window cfm min 909. Window cfm avg 932. wACH max 16.1. wACH min 15.3. wACH avg 15.7. wACH Copy paste check (does not match calcultated) 19.5.

Room 2. ACH Copy paste check (uses total or outside) 6.5. Window opening length (inches) 43. Window opening height (inches) 4. Co2 ambient (ppm) 400. Co2 test start (ppm) 2130. Co2 test end (ppm) 1306. Run time (min:sec) 6:00. Window air velocity max 770. Window air velocity min 307. Window air velocity avg 570. Window outside air volume (cfm) avg 681. Window cu-ft 1.19. Window cfm max 920. Window cfm min 367. Window cfm avg 681. wACH max 6.0. wACH min 2.4. wACH avg 4.4. wACH Copy paste check (does not match calcultated) 6.5.

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.