CFM is the abbreviation for Cubic Feet per Minute, the volume of air that moves in one minute when it’s at sea level. The higher the CFM you have, the faster your range will heat up. But what would be a good CFM? That depends on how many gas ranges you need to heat in your kitchen and how big they are. If you want to know what CFM an oven needs, you can find that by multiplying its diameter by its height. The result will be the volume of air it takes in or uses up in one minute. The higher this volume, the more CFM you need. So if we take a 30″ (diameter) range (height is 15″), then we need to multiply it by 1,5 (30 x 1,5 = 45). The total volume that this range uses up is 45 cubic feet.
What Is a Good CFM Airflow for Fans?
When we talk about fans, we usually think of them blowing in our faces and getting hot. But in reality, the maximum CFM we need is somewhere between 1 and 5. A good airflow range for fans is something more significant than one but smaller than 5. A high CFM can get you a more powerful fan, but it also makes it get hotter faster, which makes the internal parts of the fan get too hot over time. A low CFM airflow can make your fan work faster, but it’s also subject to getting too hot over time because the motor’s high speed doesn’t allow it to cool down. It won’t get as hot as a higher CFM range would, but it will get warmer and warmer if you give it more and more CFM. No matter what your choice is, it would help if you never used a CFM rating higher than 1.3 to stay within safe temperature ranges.
If the volume of air you need for your range is 45 cubic feet, you need to get a fan that can provide you with at least that much air. If we sort fans by CFM, we can see that the smallest fan unit capable of providing 45 cubic feet is one with a 50 CFM rating. But you should note that these numbers are for sea level and not high altitudes. If you live in high altitudes and want to be sure about getting enough air even if our CFM numbers go down by 40%, then we should look for a unit capable of at least 90CFM (40% from the original unit of 150 CFM).
Most people use 1-5 CFM airflow for their fans, which are hotter than they need to be because they are not airtight. Some people use even higher CFM, but that’s just because they want to get the most potent fan for their money. If you want to be safe and use a lower CFM rating than 1, you also need to keep in mind that you should never let the room temperature exceed 50 degrees.
Factors Affecting a Fan’s CFM:
CFM is dependent on two factors: The diameter of the air outlet. The distance between the fan’s motor and the air outlet.
It only takes a mere 1/8″ of distance for a CFM rating to go from 1,7 to 2,7. This change also happens if the diameter of an outlet goes from 12″ to 18″. That’s why it’s so important not only to have a large diameter for your fan but also to have it as close as possible to your unit. This way, you’ll be able to heal faster and keep more heat inside without getting too hot on the outside.
The airflow can be influenced by the diameter of the fan’s air outlet. The larger the diameter, the faster your range will heat up. But if you have a small diameter, your CFM rating won’t go up as high as if you have a large one. That means that if you have a 50 cm diameter from top to bottom from your fan, it will give you 50 CFM instead of 75! The higher the CFM rating of a fan is, the higher its wattage should be. This way, you can get enough air for your range while keeping it cool inside and not burning out its motor after an hour or so.
The small increases in the amount of air a fan produces naturally do not affect the CFM rating as much as the distance between the motor and the outlet. If you decide to use a high CFM unit for your range, it shouldn’t be only that one. You should use more than one as well as long as they’re all capable of providing 50CFM or under. This way, your range will heat up faster without overheating and getting damaged after a few hours of operation.
What CFM Do I Need for a 30 Gas Range?
To find the best CFM rating for airflow, we have to divide our CFM number by 1,5 and take the result as a multiplier to CFM of your 30″ gas range. If you have a 30″ gas range with a diameter of 15″ and a height of 5 feet, then you will need a CFM rating from 67,5-135 to heat your kitchen. When it comes to exhaust ducts, this is where the problem starts. Venting is done inside the ceiling tile of your kitchen or wherever you are using an exhaust system in your commercial establishment. It means that the air has to go somewhere, and it may be out of place. That’s why you need to consider how many CFM you will use for ventilation and where you will use them if any at all.
As mentioned above, most CFM ratings for airflow are based on the diameter of the range or duct system, not the actual size of the heating element itself (the burner). That is why you need to know your actual size and how many ranges and ductworks you will use. Your CFM rating should be the total number of those mentioned above 30″ diameter range multiplied by 1,5 (45 x 1.5 = 67,5). It’s good to have a backup as well, which is why you can multiply it with another factor such as 2 (67,5 x 2 = 135) just in case this is not enough.
When choosing the CFM rating for fans, you need to calculate your range’s volume and see what CFM rating is best for your business. Contact us today and get the best airflow ventilation system for your indoor environment! If you don’t know how to size fans, let our engineers do it for you.