Clean Air Building Certificate

Space Type: BOS-School
Establishment Name: Winthrop John 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 Max ACH: 15.1 Avg ACH: 8.5 eACH: 0
Filter MERV:
Percent Outside Air: 100
ON and Ventilates Entire Indoor Area: Yes
Vent Clearance min 6 ft: Yes
No of Rooms: 7 sqft: 957.4 cuft: 9574 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 2*. ACH Copy paste check (uses total or outside) 12.5. Window opening length (inches) 36. Window opening height (inches) 4. Co2 ambient (ppm) 399. Co2 test start (ppm) 2902. Co2 test end (ppm) 2052. Run time (min:sec) 5:00. Window air velocity max 919. Window air velocity min 435. Window air velocity avg 606. Window outside air volume (cfm) avg 606. Window cu-ft 1.00. Window cfm max 919. Window cfm min 435. Window cfm avg 606. wACH max 6.8. wACH min 3.2. wACH avg 4.5. wACH Copy paste check (does not match calcultated) 12.5.

Room Tchrs Lnge. ACH Copy paste check (uses total or outside) 15.1. Window opening length (inches) 34. Window opening height (inches) 4. Co2 ambient (ppm) 399. Co2 test start (ppm) 3182. Co2 test end (ppm) 2083. Run time (min:sec) 2:00. Window air velocity max 611. Window air velocity min 349. Window air velocity avg 501. Window outside air volume (cfm) avg 473. Window cu-ft 0.94. Window cfm max 577. Window cfm min 330. Window cfm avg 473. wACH max 11.2. wACH min 6.4. wACH avg 9.2. wACH Copy paste check (does not match calcultated) 15.1.

Room 4. ACH Copy paste check (uses total or outside) 5.3. Window opening length (inches) 39. Window opening height (inches) 4. Co2 ambient (ppm) 418. Co2 test start (ppm) 2048. Co2 test end (ppm) 1223. Run time (min:sec) 8:00. Window air velocity max 737. Window air velocity min 389. Window air velocity avg 556. Window outside air volume (cfm) avg 602. Window cu-ft 1.08. Window cfm max 798. Window cfm min 421. Window cfm avg 602. wACH max 5.9. wACH min 3.1. wACH avg 4.5. wACH Copy paste check (does not match calcultated) 5.3.

Room 9. ACH Copy paste check (uses total or outside) 4. Window opening length (inches) 39. Window opening height (inches) 4. Co2 ambient (ppm) 418. Co2 test start (ppm) 2069. Co2 test end (ppm) 1264. Run time (min:sec) 10:00. Window air velocity max 390. Window air velocity min 32. Window air velocity avg 136. Window outside air volume (cfm) avg 147. Window cu-ft 1.08. Window cfm max 423. Window cfm min 35. Window cfm avg 147. wACH max 2.7. wACH min 0.2. wACH avg 1.0. wACH Copy paste check (does not match calcultated) 4.

Room 6. ACH Copy paste check (uses total or outside) 7.1. Window opening length (inches) 37. Window opening height (inches) 4. Co2 ambient (ppm) 400. Co2 test start (ppm) 2030. Co2 test end (ppm) 1200. Run time (min:sec) 6:00. Window air velocity max 657. Window air velocity min 363. Window air velocity avg 538. Window outside air volume (cfm) avg 553. Window cu-ft 1.03. Window cfm max 675. Window cfm min 373. Window cfm avg 553. wACH max 5.0. wACH min 2.8. wACH avg 4.1. wACH Copy paste check (does not match calcultated) 7.1.

Room 10. ACH Copy paste check (uses total or outside) 7.4. Window opening length (inches) 37. Window opening height (inches) 4. Co2 ambient (ppm) 400. Co2 test start (ppm) 2200. Co2 test end (ppm) 1375. Run time (min:sec) 5:00. Window air velocity max 638. Window air velocity min 38. Window air velocity avg 212. Window outside air volume (cfm) avg 218. Window cu-ft 1.03. Window cfm max 656. Window cfm min 39. Window cfm avg 218. wACH max 4.8. wACH min 0.3. wACH avg 1.6. wACH Copy paste check (does not match calcultated) 7.4.

Room 103. ACH Copy paste check (uses total or outside) 9.9. Window opening length (inches) 72. Window opening height (inches) 4. Co2 ambient (ppm) 404. Co2 test start (ppm) 2020. Co2 test end (ppm) 1109. Run time (min:sec) 5:00. Window air velocity max 1196. Window air velocity min 404. Window air velocity avg 737. Window outside air volume (cfm) avg 1474. Window cu-ft 2.00. Window cfm max 2392. Window cfm min 808. Window cfm avg 1474. wACH max 15.0. wACH min 5.1. wACH avg 9.2. wACH Copy paste check (does not match calcultated) 9.9.

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.

Serial Number: CAB-1763-05162025
Not valid without serial number.


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