Large spaces like restaurants, warehouses, commercial buildings, schools, and hospitals need commercial exhaust fans in order to keep the indoor air circulating and fresh. Exhaust fans remove heat, stale air and fumes from enclosed areas. They make workplaces and other large buildings more comfortable by removing stale air and bringing in fresh air through intake louvers. Different types of industrial exhaust fans and chimney exhausts are suitable for different purposes and structures.

Types of exhaust fans
Commercial exhaust fans are typically larger than residential ones, and have a higher CFM (cubic feet per minute) rating. CFM measures the total changes of air in a given period of time.
The size and type of exhaust fan needed depends on a number of factors. These include the purposes for which a space will be used, its total volume, as well as environmental factors like the humidity and the level of fumes.
Exhaust fans can be used in conjunction with intake louvers which draw in fresh air. Together they create a system that circulates fresh air and removes stale air. This makes spaces like commercial kitchens, gyms and restaurants comfortable and safe.

Exhaust fans and chimney exhausts for large buildings
Different types of exhaust fans and chimney exhausts are used according to the size and purpose of the building. For instance, in areas where there are high-static pressure losses, utility fans are typically used. These are roof-mounted so that the inlet and outlet are 90 degrees from each other.
For hospital buildings, a popular type of fan is the laminar fan, because of its high efficiency. It circulates air 300 times per hour. For exceptionally large spaces, such as bathrooms which have ceilings that are over eight feet high, extra venting may be needed, as well as exhaust fans.
Exhaust fans can help reduce electric costs
Installing the right kinds of ventilating fans, exhausts and chimney exhausts can also help in reducing cooling costs and electric bills. The exhaust system works with the cooling and refrigeration system to lower temperatures without running up a huge bill. For example:

• The cost operating a small, two-fan walk-in freezer can be reduced by installing fans with efficient motors. It has been shown that using ?electronically commutated? (ECM) motors can save around $200 a year per fan.
• Fans can help to cut central cooling and air conditioning costs by 12 to 15%. They can make it possible set the thermostat three degrees Fahrenheit higher while maintaining a comfortable temperature.
• Adding ventilation controls can reduce exhaust costs by 30 to 50%. These can be installed at the same time as new exhaust systems or they can be fitted to existing systems.

Regular cleaning of exhaust systems
Regular cleaning and maintenance of exhaust systems and chimney exhausts is necessary for their efficient functioning and for public health. Over time, these build up accumulations of dirt and grease which can interfere with the functioning of the exhaust system. In restaurant kitchens, with their high temperatures and oil fumes, such build-up can become hazardous.
To avoid accidents, restaurant exhaust systems and chimney exhausts are normally cleaned every three months, on average. With exceptionally heavy use, the interval between cleanings could be shortened.

For a variety of commercial, public and residential buildings, exhaust fans maintain a clean and comfortable atmosphere. By keeping indoor air fresh and circulating, they help to prevent health problems and accidents. The right type of exhaust fans, used in conjunction with intake louvers for fresh air and chimney exhausts can also lower overall costs and electric bills.

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