Exhaust Fan Calculator

Check the number of Exhaust fans required in your premises.

Note : Unit of measurement - Meter

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Disclaimer : Actual quantity may vary depending on the obstructions and type of work inside the premises.

Industrial exhaust fan size-based selection guide on workspace area calculation

Average Air Changes Per Hour (ACH) Table by Premises

To ensure optimal ventilation in your industrial space, it's crucial to know the recommended air changes per hour (ACH) based on the type of premises. Below, you'll find a table that outlines the average ACH required for various industrial environments. This information will help you determine the appropriate CFM and select the right exhaust fan for effective airflow and air quality maintenance.

Types of Premises Air Change in Hour (ACH)
All spaces in general min 4
Assembly halls 4 - 6
Attic spaces for cooling 12 - 15
Public Auditoriums 8 - 15
Bakeries 20 - 30
Banks/Building Societies 4 - 8
Bars 20 - 30
Bathrooms 6 - 10
Bedrooms 5 - 6
Pool Halls 6 - 8
Boiler Rooms 15 - 30
Bowling Alleys 10 - 15
Cafeterias 12 - 15
Canteens 8 - 12
Basement 3 - 10
Changing Rooms Main area 6 - 10
Changing Rooms Shower area 15 - 20
Churches 8 - 15
Cinemas and theatres * 10 - 15
Classrooms 6 - 20
Clubhouses 20 - 30
Cocktail Lounges 20 - 30
Compressor rooms 10 - 20
Computer Rooms 15 - 20
Conference rooms 8 - 12
Copy Room 10 - 12
Court Houses 4 - 10
Dairies 8 - 10
Dance halls 12 minimum
Dental surgeries 12 - 15
Large Shops 6 - 10
Dining Halls 12 -15
Restaurant Dining Area 12
Chemists 6 - 10
Dye works 20 - 30
Electroplating shops 10 - 12
Engine rooms 15 - 30
Factories and workshops 8 - 10
Factory buildings, with fumes or moisture 10 - 15
Fire Stations 4 - 10
Food Staging Area 10 - 12
Foyer - public buildings 15 - 20
Metal Workshop 15 - 20
Galvanizing plants 20 - 30
Garages 6 - 8
Garages repair 20 - 30
Garages storage 4 - 6
Greenhouses 25 - 60
Gymnasiums 6 minimum
Hairdressing salons 10 - 15
Hospital rooms 4 - 6
Hospitals - sterilising 15 - 25
Hospitals - wards 6 - 8
Types of Premises Air Change in Hour (ACH)
Kitchens - commercial 30 minimum
Kitchens - domestic 15 - 20
Laboratories 6 - 15
Laundrettes 10 - 15
Laundry Room 8 - 10
Lavatories 6 - 15
Lecture theatres 5 - 8
Libraries 3 - 5
Living rooms 6 - 8
Lunch Rooms 12 -15
Machine shops 6 - 12
Malls 6 - 10
Medical Offices 8 - 12
Mills, paper 15 - 20
Mills, textile dye houses 15 - 20
Mills, textile general buildings 4 minimum
Municipal Buildings 4 - 10
Museums 12 -15
Mushroom houses 6 - 10
Nightclubs 20 - 30
Offices 6 - 10
Offices, private 4 minimum
Offices, public 3 minimum
Paint shops (not cellulose) 10 - 20
Photo & X-ray darkrooms 10 - 15
Pump rooms 5 minimum
Recording control rooms 15 - 25
Recording studios 10 - 12
Restaurants 8 - 12
Retail Outlets 6 - 10
School Classrooms 4 - 12
Shopping Centers 6 - 10
Shops and supermarkets 8 - 15
Shops, paint 15 - 20
Shops, woodworking 5 minimum
Shower baths 15 - 20
Smoking Room 13 - 15
Squash courts 4 minimum
Stores & warehouses 3 - 6
Substation, electric 5 - 10
Supermarkets 4 - 10
Swimming pools 20 - 30
Taverns 20 - 30
Theaters 8 - 15
Toilets 6 - 10 6 - 10
Town Halls 4 - 10
Transformer rooms 10 - 30
Turbine rooms, electric 5 - 10
Utility rooms 15 - 20
Waiting rooms - public buildings 4 minimum
Warehouses 6 - 30
Welding shops 15 - 30

FAQs

What is an Industrial Exhaust Fan Calculator and how does it work?

An industrial exhaust fan calculator is a tool designed to help you determine the appropriate size and specifications of an exhaust fan for industrial settings. By inputting key parameters such as room dimensions, type of industrial application, and the required air changes per hour (ACH), the calculator provides recommendations on the optimal fan size and model to ensure effective ventilation in your facility.

The required air changes per hour (ACH) depend on the type of industrial application and its specific ventilation needs. For example, areas with high levels of fumes, dust, or heat may require higher ACH. You can refer to industry standards or consult with our ventilation experts to determine the appropriate ACH for your specific application. Our industrial exhaust fan calculator also provides default ACH values based on common industrial applications.

To calculate CFM (Cubic Feet per Minute), you need to determine the volume of the space (length × width × height) and multiply it by the required air changes per hour (ACH). Then, divide by 60 to convert to minutes.

The formula to calculate CFM is:
CFM = (Room Volume in Cubic Feet × ACH) / 60
where:
ACH — Air change per hour.
The unit of airflow is CFM, which means cubic feet per minute.

Good airflow in industrial settings typically ranges from 4 to 12 ACH, depending on the specific application. For example, warehouses may require around 4-6 ACH, while areas with heavy fumes or dust might need 10-12 ACH.

Yes, the industrial exhaust fan calculator not only helps in determining the correct fan size but also recommends specific models from our product range that meet your requirements. Based on the calculated airflow needed, it matches you with suitable exhaust fans that offer optimal performance and efficiency for your industrial space.

Absolutely! Our industrial exhaust fan calculator is designed to accommodate a wide range of industrial applications, from manufacturing plants and warehouses to chemical processing facilities and more. Whether you need to ventilate a small workshop or a large production floor, the calculator can provide tailored recommendations to ensure effective and efficient ventilation for your specific industrial environment.