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Calculate Size of Ventilation Fan

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Calculate Size of Ventilation Fan

§  Calculate Size of Ventilation Fan for Bathroom of 10 Foot Long,15 Foot width and 10 foot height .

 

Calculation:

§  Area of the Room=Length x Width x Height

§  Area of the Room=10 x 15 x 10 =1500 Cub. Foot

§  From the table Air Changing Rate (ACH) for Bathroom = 8 Times/Hour.

§  Size of Ventilation Fan = (Area of Room x ACH ) / 60

§  Size of Ventilation Fan = (1500 x 8 ) / 60 = 200 CFM

§  Size of Ventilation Fan = 200 CFM

 

Recommended Air Change Rates For  Room  (ACH)

Type of Room

Air Change Rate /Hour

Consider

Shower Area

15 To 20

20

Bathroom & Shower Rooms

15 To 20

15

Bathroom

6 To 10

8

Bedrooms


2 To 4

4


Halls & Landings

4 To 6

5

Kitchens

10 To 20

15

Living & Other Domestic Rooms

4 To 6

5

Toilets – Domestic

6 To 10

8

Utility Rooms

15 To 20

15

Cafés

10 To 15

15

Canteens

8 To 12

10

Cellars

3 To 10

6

Changing Rooms with Showers

15 To 20

15

Conference Rooms

8 To 12

8

Garages

6 To 10

8

Hairdressing Salons

10 To 15

13

Hospital Wards

6 To 8

7

Laundries & Launderettes

10 To 15

13

Meeting Rooms

6 To 12

7

Offices

4 To 6

6

Restaurants & Bars

10 To 15

12

School Rooms

5 To 7

6

Shops

8 To 10

9

Sports Facilities

4 To 6

6

Store Rooms

3 To 6

5

Workshops

6 To 10

8

Assembly rooms

4 To 8

8

Bakeries

20 To 30

25

Banks/Building Societies

4 To 8

5

Billiard Rooms *

6 To 8

5

Boiler Rooms

15 To 30

25

Canteens

8 To 12

10

Changing Rooms Main area

6 To 10

8

Changing Rooms Shower area

15 To 20

17

Churches

1 To 3

3

Cinemas and theatres *

10 To 15

12

Club rooms

0.12

0.12

Compressor rooms

10 To 15

15

Conference rooms

8 To 12

12

Dairies

8 To 10

10

Dance halls

0.12

0.12

Dental surgeries

12 To 15

15

Dye works

20 – 30

30

Electroplating shops

10 To 12

 

Engine rooms

15 To 30

30

Entrance halls & corridors

3 To 5

5

Factories and workshops

8 To 10

10

Foundries

15 To 30

20

Glasshouses

25 To 60

50

Gymnasiums

0.6

0.6

Hospitals – Sterilizing

15 To 25

20

Kitchens – Domestic

15 To 20

15

Kitchens – Commercial

0.3

0.3

Laboratories

6 To 15

12

Lavatories

6 To 15

12

Lecture theatres

5 To 8

8

Libraries

3 To 5

4

Mushroom houses

6 To 10

8

Paint shops (not cellulose)

10 To 20

15

Photo & X-ray darkrooms

10 To 15

12

Public house bars

0.12

0.12

Recording control rooms

15 To 25

20

Recording studios

10 To 12

10

Shops and supermarkets

8 To 15

12

Squash courts

0.04

0.04

Swimming baths

10 To 15

12

Welding shops

15 To 30

20

 

 


Courtesy : Jignesh Parmar, from the blog : https://electricalnotes.wordpress.com/2017/09/03/calculate-size-of-ventilation-fan/

Last Updated on Monday, 04 September 2017 05:00