CFM stands for cubic feet per minute (it is also referred to as airflow). Put simply, CFM is how much air a fan moves. The measurement is taken when the ceiling fan is on its highest speed and uses both the volume of air and the rate at which it moves.
A higher CFM is always better for your kitchen fan. You can always run a high CFM hood on lower settings. It provides great ventilation by moving a heavy amount of air per minute.
Cubic Feet per Minute – or CFM – determines the amount of air that a fan can move through a room while operating at the highest speed. The larger the space, the higher the fan CFM must be in order to efficiently cool a room. CFM for fans is a critical measurement for determining if a room can be cooled.
One cfm is needed per square foot (1 cfm/sq ft) of floor area. This is the average air quantity required for a room or an entire building.
CFM = (fpm * area), where fpm is the feet per minute. To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.
Not only is the Slipstream Energy Star Certified, but it produces a high CFM rating of 8,778.
Simply put, the higher the CFM, the more air the hood vents out of your kitchen. To power your range hood, you need at least 100 CFM for every 10,000 BTUs of your stovetop. For example, a 100,000 BTU stove needs at least a 1000 CFM range hood.
Choosing a fan with four or five blades used to be the best way to ensure quiet operation, as more blades tend to create natural balance within the fan. This balance keeps the ceiling fan centered, causing it to produce less ambient noise than one with fewer blades.
4-blade ceiling fans are less noisy and are useful in rooms with an air conditioner, to move the cool air around. They are often more stylish looking. However, 4 blade fans may move air slower than a 3 blade fan and can be more expensive than 3 blade ceiling fans.
|Small Space (under 200 sq. ft)||2000 – 3000|
|Standard Bedroom, Kitchen etc. (200 – 300 sq. ft.||3000 – 4000|
|Large Bedroom, Living Room etc. (300 – 450 sq. ft.)||4000 – 6000|
|Very Large Spaces (450 sq. ft. and up)||5000 – 9000|
To calculate multiply length x width x height of growing area e.g. A room that is 8′ x 8′ x 8′ will have a volume of 512 cubic feet. Your extraction fan should be able to adequately exchange the air in an indoor garden once every three minutes. Therefore, 512 cubic feet / 3 minutes = 171 CFM.
One way to measure ventilation is to figure out how often the air in a space is completely replaced. This is called Air Changes per Hour (ACH). In a 30-foot by 30-foot classroom that has 25 students in it, the air should be replaced at least every 15 minutes, which equals an ACH of 4.
The best overall fan is the Vornado 660 Large Room Air Circulator (view at Amazon), which is capable of cooling off large rooms without making much noise. If you prefer the look of a tower fan, though, go with the Seville Classics UltraSlimline 40-Inch Oscillating Tower Fan (view at Amazon).
|1||Luminous||Luminous Dhoom 1200mm 70-Watt High Speed Ceiling Fan|
|2||Orient||Orient Electric Apex-FX 1200mm Ceiling Fan|
|3||Activa||Activa Apsara 1200 MM High Speed Ceiling Fan|
|4||Bajaj||Bajaj Frore 1200 mm Ceiling Fan|
The horsepower – Metric unit number 0.065 hp converts to 1 atm cfm, one atmosphere cubic foot per minute. It is the EQUAL power value of 1 atmosphere cubic foot per minute but in the horsepower – Metric power unit alternative.
The rule of thumb is that you need at least 1 CFM per square foot of room area. To determine the square footage of your bathroom, multiply the length times the width. For example, if your bathroom is 6 feet wide and 9 feet long, its square footage is 54. Therefore, it should have a fan rated for at least 54 CFM.
There is a common misconception that five ceiling fan blades work better than four or even three blades. Homeowners assume that five blades means better air movement, circulation, and less cooling costs, but in reality, all five blades do is add aesthetic appeal.
Choosing the Appropriate Mounting System
Ceiling fans should be installed, or mounted, in the middle of the room and at least 7 feet above the floor and 18 inches from the walls. If ceiling height allows, install the fan 8 – 9 feet above the floor for optimal airflow.
A range hood with 900+ CFM will be enough to clean your kitchen air and keep your kitchen smelling fresh. In general, it’s better to go with more CFM than less.
Bathroom fan sound levels are measured in sones: 4.0 sones is the sound of standard television operation; 3.0 sones is typical office noise; 1.0 sones is the sound of a refrigerator; and 0.5 sones is the sound of rustling leaves. For quiet bathroom ventilation the fan should be rated at 1.0 sones or less.
Noise and Brightness
Ceiling fans are very large and can be quite loud. They are often found in kitchens, bedrooms, and living rooms. Their size is one aspect that interior designers find ugly, but the brightness of the light fixture is also a major problem.
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