Adequate ventilation is necessary to push stale air outside of a building, and bring fresh air in. Commercial exhaust fans are a necessity, but installing the wrong type of exhaust fan could end up costing you a lot of money.
How can you make sure you are using the right equipment to ventilate your commercial building properly? These tips will help you choose the right commercial exhaust fan for your needs.
1. Determine the size of the room that needs ventilation
You should start by determining which space needs ventilation. Are you looking for a commercial exhaust fan for a kitchen, a factory, an office, or a hallway? Measure the room or the rooms that are in need of ventilation.
Knowing these measures will help you find the right exhaust fan. If your plan is to ventilate a very large building, you will certainly need to purchase and install more than one commercial exhaust fans.
2. Consider the different types of fans available
All commercial exhaust fans are designed to move air from one space to another, but there are different models available on the market. All types of commercial exhaust fans can either be installed in a wall, on a roof, or in a duct.
Direct drive fans are perfect for low volume and low static pressure requirements, and they don’t require a lot of maintenance. Belt drive fans and wheel propeller fans are ideal if you want to move large volumes of air, with low static pressure.
Finally, centrifugal fans are more quiet, and they are more efficient when a high static pressure is needed.
3. Calculate the CFM your commercial exhaust fan needs
The air volume flow rate of commercial exhaust fans is measured in CFM, or cubic feet per minute. There are different ways to calculate the CFM needed to ventilate a room, and you will first need to calculate the volume of this room by multiplying its length, its width and its height. You will then have to divide the volume of the room by the number of minutes per change needed
The number of minutes per change you will need to properly ventilate a room should appear in your local building codes. Once you know the CFM required, it will be more simple to search for the right commercial exhaust fan.
4. Think about static pressure
You also have to be able to figure out the static pressure needed if you want to choose the right fan. More static pressure will be required for a ducted exhaust fan than for a non-ducted one.
Keep in mind that for each cubic foot of air a commercial exhaust fan pushes out of a room, it needs to be able to provide one cubic foot of fresh air.
5. Don’t forget your exhaust fan will produce some noise
The sound levels generated by commercial exhaust fans is calculated in sones. Depending on where you want to install your commercial exhaust fan, you will need to pay attention to the sones it produces.
6. Make sure the ducts and vents of your exhaust fan will be installed properly
Finally, make sure that if the commercial exhaust fan you choose requires ducts, you will have enough space to install them properly. They should be connected to the outdoor vents in a direct route, as much as possible.
Your exhaust vents should not be placed directly besides your air supply vents, to avoid contaminating clean air with the pollutants that could be present in your exhaust air.