Building Ventilation

Western and Facilities Management is committed to providing a safe and healthy work environment for the entire campus community. This is especially true in our approach to maintaining a safe indoor environment through the operations of our heating ventilation and air conditioning (HVAC) systems controlled by the Western Environmental System.

We follow the ASHRAE (American Society of Heating, Refrigeration and Air-conditioning Engineers) standards and guidelines. Although indoor space ventilation is considered a secondary issue for managing COVID-19 risks, ASHRAE through its COVID-19 Epidemic Task Force, published Core Recommendations for Reducing Airborne Infectious Aerosol Exposure. Western has followed these guidelines carefully and has adopted a number of practices to support ventilation improvements. 

Western's Classroom Ventilation Database

The health and safety of our entire community is our highest priority. Classrooms are expected to be at or near capacity with all students wearing masks. Vaccination remains the most important factor in protecting the community, and all students, faculty and staff are required to be fully vaccinated unless exempt under the Ontario Human Rights Code or for medical reasons. Those who are not vaccinated will be subject to additional health and safety protocols, such as regular testing.

The Facility Development & Engineering team undertook an analysis of all classrooms on campus. We brought in an external consultant to independently assess the air flow in a representative 15% of classrooms across a number of buildings. The findings from this assessment are that the ventilation in all classrooms at Western meet, and most even exceed, the designed ventilation for the spaces.

Further, we have conducted an analysis of the Equivalent Air Changes (eACH) per hour in some 388 classrooms and general spaces on campus. While there are no regulated targets for Equivalent Air Changes (eACH) per hour, Western has followed the air-exchange recommendations outlined by the Harvard T. H. Chan School of Public Health, through their Healthy Buildings for Health program as follows: 

Healthy Buildings for Health program air-exchange recommendations (6 ACH = Ideal to <3 ACH = Low).
The analysis found 99% of rooms have ideal or excellent ratings when buildings draw maximum airflow from outside. Even when the outside air intake is reduced to ‘minimum’ levels (to cool a building more efficiently and provide greater comfort in humid weather, for example), 94% of classrooms are at ideal or excellent ratings.

The individual eACH can be found for buildings and rooms below.

The eACH values listed below assume minimum outside air intake. Rooms with air purifiers are denoted by an *.

3M Centre

Room Number eACH
3250 12

Alexander Charles Spencer Engineering Building

Room Number eACH
1056 6
1059 12
1200 8
2094* 5
2099 7
2100 5
2200 8
2202 6
3109 6

Althouse College (Faculty of Education Building)

Room Number eACH
1050 27
1052 7
1054 6
1100 14
1114 11
1118 12
1162 6
2011 13
2013 8
2015 7
2017 7
2021 7
2023 7
2025 7
2027 7
2029 7
2035 7
2036 8
2038 6
2040 7
2042 7
2046 7
2049 7
2051 6
2054 6

Alumni Hall

Room Number eACH
17*
(air purifier will be installed by Sept. 24)
6
101 11
200 7

Amit Chakma Engineering Building

Room Number eACH
1410* 4
1415* 4
1420* 4
1450 9

Arthur & Sonia Labatt Health Science Building

Room Number eACH
9 10
11 12
14 8
35 8
40 9
236 11
240 11

Arts and Humanities Building

Room Number eACH
1B02 7
1B04 9
1B06 7
1B08 7
1R40 7
2B02 7
2B04 9
3B02 7
3B04 9

Biological & Geological Sciences

Room Number eACH
153 12
165 16
1056 12

Chemistry Building

Room Number eACH
9 9
115 10

Dental Sciences Building

Room Number eACH
10 11
1002 8
2016 10
3008 6
0142H 9
2005A-1 6
2005A-2 6

Elborn College

Room Number eACH
1330 20
1534 5
1538 5
1543 7
1547 6
1548 5
1563 7
1576 6
2130 17
2155 9
2168 9
2180 8
2508 9
2510 13
2525 17
2578 8
1520C 5

FIMS & Nursing Building

Room Number eACH
1200 8
1220 8
1240 10
1250 10
1270 8
2210 8
2220 8
2230 11
2240 11
2324 8
2330 8
2360 6
3210 10
3220 11
4070 6
4110 6
4130 6

Health Sciences Addition

Room Number eACH
H 9 15
H018 15
H062 7
H064 6
H066 6
H068 7
H19 13
H62 7
H64 6
H66 6
H68 7

International and Graduate Affairs Building

Room Number eACH
1N05 11

Ivey Spencer Learning Centre

Room Number eACH
102 7
110 9
114 13
1150 19
1157 15
3350 11
3351 12
3370 19
3372 14
1150A 8
1150C 12

Kresge Building

Room Number eACH
K103 7
K106 13
K203 9
K208 9

Law Building

Room Number eACH
34 12
36 7
38 8
44 13
51 6
52* 6
100 15
202 9
204 10
205 7
206 7
207* 6

Lawson Hall

Room Number eACH
1218 7
1227 8
2205 6
2210 6
3220 6
2270C 8

Materials Science Addition

Room Number eACH
204 13
3204 11

Medical Science Building

Room Number eACH
16 13
17 12
18 14
22 15
23 14
27 16
28 15
29 15
146 9
148 12
190 12
282 13
384 13
193A 10
193B 14
193C 10
193D 15

Middlesex College

Room Number eACH
17 18
104 17
106 17
107 16
108 17
110 11
204 15
300 7
316 11
320 12
105B 6
105C 12
15A 6
15B 9
16A 20
16B 19

Music Building

Room Number eACH
MB140 6
MB227 5
MB241 10
MB254 8
MB321 9
MB341 10
MB441 9
MB541 8

Natural Sciences Centre

Room Number eACH
1 6
7 7
145 6
153 5

North Campus Building

Room Number eACH
101 5
105 7
113 7
114 7
117 8
283 7
284 7
285 7
293 21
295 10
296 13

Physics and Astronomy Building

Room Number eACH
26 17
34 10
36 12
48 8
49 8
100 9
106 9
108 11
117 6
148 9
150 9
327 14

Richard Ivey School of Business

Room Number eACH
1100 11
1120 12
1130 12
1140 12
1200 12
1210 12
1220 12
1230 12
1240 12
1310 8
1320 7
1330 8
1340 7
1350 8
1360 9
1370 11
1380 9
1390 10
2115 19
2120 19
2125 19
0140A 9
0140B 9
102A 6
102B 6

Social Science Centre

Room Number eACH
1004 5
1032 9
1059 6
1425 8
2020 9
2024 8
2028 6
2032 11
2036 9
2050 6
2257 9
3006 11
3010 11
3014 10
3018 9
3022 6
3024 6
3026 9
3028 8
3102 10
3108 10
3120 14
3219 7
3220 7
3221 7
3227 10
3315 13
4032 10
4103 10
4105 9
4107 9
4112 10
4161 10
4255 10
4317 9
5220 17
5230 7
5235 8
5406 9
5427 8
5428 9
7200 6
7210 6
7236 7
7409 8
8409 18
8440 8
3207C 7

Somerville House

Room Number eACH
2316 8
2317 8
2355 11
3305 6
3307 6
3315 7
3317 7
3345 14
3350 6
3355 5
3359 7

Stevenson Hall

Room Number eACH
1119 8
1140 7
1145 7
1155 8
1157 8
2166 6
3101 11
3166 11

Talbot College

Room Number eACH
100 7
101 7
128 6
141 11
201 9
202 9
203 8
204 9
205 9
303 9
305 9
309 9
310 9
340 6
341 9
342 9
343 9
345 9
357 9
302B 11

University College

Room Number eACH
1105 7
1110 9
1225 6
2105 8
2110 7
2115 9
2120 9
3110 17
3120 14
3220 8
3225 7
3305 12
3320 9
3415 10
4401 14

University Community Centre

Room Number eACH
37 10
41 14
56 7
58 7
59 9
60 7
61 8
63 6
65 7
66 6
67 6
146 7
54A 7
54B 7

Visual Arts Centre

Room Number eACH
100 7
247 9
249 7

Weldon Library

Room Number eACH
120 10
121 13
258 12

Western Centre for Public Health & Family Medicine

Room Number eACH
1150 7
4004 11
4005 12
4006 8
4010 10
4117 6
4119 7
4121 7
4123 7
4125 8

Western Interdisciplinary Research Building

Room Number eACH
1110 8
1120 10
1130 9
1160 6
1170 6
3000 17

Western Science Centre

Room Number eACH
55 8
240 6
248 5

Westminster Hall

Room Number eACH
20 7
36 8
20E 6
20F 6
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