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 408 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), 98% 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 11

Alexander Charles Spencer Engineering Building

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

Althouse College (Faculty of Education Building)

Room Number eACH
1050 24
1052 6
1054 6
1100 13
1114 10
1118 11
1162 6
2011 12
2013 8
2015 6
2017 6
2021 6
2023 6
2025 6
2027 6
2029 6
2035 5
2036 7
2038 5
2040 7
2042 7
2046 7
2049 7
2051 6
2054 5

Alumni Hall

Room Number eACH
17* 7
101 10
200 6

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 9
11 11
14 8
35 7
40 8
236 10
240 10

Arts and Humanities Building

Room Number eACH
1B02 6
1B04 6
1B06 7
1B08 6
1R40 6
2B02 7
2B04 6
3B02 7
3B04 6

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
0010 10
1002 7
2016 9
3008 6
0142H 6
2005A-1 6
2005A-2 6

Elborn College

Room Number eACH
1330 20
1534 4
1538 5
1543 6
1547 6
1548 5
1563 6
1576 5
2130 15
2155 8
2168 8
2180 7
2508 8
2510 12
2525 15
2578 7
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 7
2330 7
2360 5
3210 10
3220 11
4070 6
4110 6
4130 5

Health Sciences Addition

Room Number eACH
H 9 13
H018 14
H062 7
H064 6
H066 6
H068 7
H19 12
H62 7
H64 6
H66 6
H68 7

International and Graduate Affairs Building

Room Number eACH
1N05 10

Ivey Spencer Leadership Centre

Room Number eACH
102 5
110 6
114 9
1150 13
1157 10
3350 11
3351 12
3370 13
3372 10
1150A 6
1150C 8

Kresge Building

Room Number eACH
K103 7
K106 12
K203 8
K208 8

Law Building

Room Number eACH
34 11
36 6
38 7
44 12
51 5
52* 6
100 13
202 8
204 9
205 7
206 5
207* 6

Lawson Hall

Room Number eACH
1218 7
1227 7
2205 6
2210 6
3220 4
2270C 7

Materials Science Addition

Room Number eACH
204 13
3204 10

Medical Science Building

Room Number eACH
16 12
17 11
18 13
22 14
23 13
27 15
28 13
29 13
146 8
148 10
190 11
282 13
384 13
193A 10
193B 13
193C 10
193D 14

Middlesex College

Room Number eACH
17 14
104 13
106 13
107 12
108 13
110 10
204 12
300 5
316 8
320 9
105B 6
105C 10
15A 5
15B 8
16A 15
16B 15

Music Building

Room Number eACH
MB140 6
MB227 5
MB241 10
MB254 7
MB321 9
MB341 9
MB441 9
MB541 8

Natural Sciences Centre

Room Number eACH
1 6
7 6
145 6
153 4

North Campus Building

Room Number eACH
101 5
105 7
113 7
114 7
117 7
283 7
284 6
285 8
293 19
295 9
296 12

Physics and Astronomy Building

Room Number eACH
26 15
34 10
36 12
48 7
49 7
100 9
106 9
108 9
117 6
148 9
150 9
327 11

Richard Ivey School of Business

Room Number eACH
1100 10
1120 11
1130 11
1140 11
1200 11
1210 11
1220 11
1230 11
1240 11
1310 7
1320 7
1330 7
1340 7
1350 7
1360 8
1370 10
1380 8
1390 9
2115 18
2120 18
2125 18
0140A 8
0140B 8
102A 5
102B 6

Social Science Centre

Room Number eACH
1004 5
1032 8
1059 6
1425 7
2020 8
2024 8
2028 6
2032 10
2036 9
2050 5
2257 11
3006 10
3010 10
3014 9
3018 8
3022 5
3024 5
3026 8
3028 7
3102 9
3108 9
3120 12
3219 6
3220 7
3221 6
3227 9
3315 12
4032 9
4103 9
4105 8
4107 8
4112 9
4161 9
4255 10
4317 9
5220 15
5230 7
5235 8
5406 8
5427 7
5428 8
7200 5
7210 6
7236 7
7409 7
8409 16
8440 7
3207C 6

Somerville House

Room Number eACH
2316 8
2317 7
2355 10
3305 5
3307 5
3315 6
3317 6
3345 13
3350 5
3355 4
3359 6

Stevenson Hall

Room Number eACH
1119 7
1140 6
1145 5
1155 7
1157 7
2166 6
3101 10
3166 10

Talbot College

Room Number eACH
100 6
101 7
128 6
141 10
201 8
202 8
203 8
204 8
205 8
303 8
305 8
309 9
310 8
340 5
341 8
342 8
343 8
345 8
357 8
302B 10

University College

Room Number eACH
1105 7
1110 8
1225 6
2105 8
2110 7
2115 8
2120 8
3110 16
3120 11
3220 8
3225 7
3305 11
3320 9
3415 9
4401 13

University Community Centre

Room Number eACH
37 9
41 13
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 6
247 8
249 6

Weldon Library

Room Number eACH
120 8
121 10
258 9

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 15

Western Science Centre

Room Number eACH
55 7
240 5
248 5

Westminster Hall

Room Number eACH
20 6
36 5
20E 5
20F 5
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