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Exhaust Fan Calculator
Check the number of Exhaust fans required in your premises.
Note : Unit of measurement - Meter
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
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.
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.