Today, 4 blade ceiling fans are a popular household appliance. They come in a variety of colors, features, and with varying motor speed. While some fans have a simple and neat finish, others may have a more elegant and classy look. Some 4 blade ceiling fans also come with a light compartment, thus, serving two functions simultaneously. 4 blade ceiling fans that come with above average and high-performance motors are great for cooling rooms.
Motor Speed Of A 4 Blade Ceiling Fan
The motor of a ceiling fan is what determines its efficiency in circulating air. The better the motor, the better will be the airflow throughout the room, apart from operating smoothly and quietly. The size, quality, and power of a ceiling fan motor are the qualities that one has to consider while purchasing a 4 blade ceiling fan.
The motors that are used in the ceiling fans are basically of two types – AC and DC. AC means alternating current while DC means direct current. Both of these motors convert electrical energy into mechanical energy. The only difference is that while AC motors use alternating current, DC motors use direct current.
The speed of the motor of a 4 blade ceiling fan will depend on the kind of motor that is being used in it.
153 mm: This motor tends to get noisy and wobbly with time and prolonged usage, which may lead to reduced airflow.
172 mm: This motor is ideal for fans to be used in small rooms. It is better than the 153 mm motor and provides a decent air circulation.
188 mm: This is an above average motor which provides great airflow. Even with prolonged usage, it won’t get noisy and unstable.
212 mm: This motor is very durable and sturdy and it too, provides excellent air circulation like the above-mentioned one.
K55: Although expensive, K55 is a high-performance and extremely durable motor.
DC: Among all the motors, DC motor is the most energy efficient motor. Fans that run on DC motors can cut down your power consumption by 75%, while giving excellent air circulation.
Why Does The Number Of Fan Blades Matter?
The efficiency of a ceiling fan depends greatly on the size and the number of fan blades. A fan with longer blades will create more airflow than a fan with small blades. Also, a fan with more blades will create more airflow. However, this can be only assumed when we ignore the ‘drag’ factor or resistance. When an object slices through the air, it is met with an opposing force, known as the drag. It is due to this resistance to the airflow that a fan’s motion tends to slow down and also can increase its energy consumption.
Thus, while it is obvious that a fan with more number of blades can create a stronger and more powerful airflow, it is essential that it has a high-performance motor to complement it. This is because only a powerful motor can help overcome the drag effect.
Difference Between 4-Blade And 5-Blade Ceiling Fans
As mentioned above, going by the laws of Physics, it would be safe to say that an increased number of fan blades would mean an increased airflow. But due to the drag effect, it is not always so.
In 2011, Falahat, a researcher attempted to study the effect of the number of fan blades on airflow generation. In his study, he compared the airflow produced by an axial fan fitted with between two to six fan blades. He found that maximum airflow was generated when the fan was fitted with four blades tilted between 45 to 55 degrees to the airflow direction. This angle can be taken as the blade pitch.
Blade pitch refers to the angle at which the blades are tilted. The best way to explain this would be to take the instance of oars of a boat. When the oars are kept parallel to the water, the boat would not move. But when they are tilted at a certain angle, it becomes easier to push the water back so that the boat can move forward. The same mechanism applies to the blades of a ceiling fan. A certain degree of tilt in the blades would slice the air better, generating a strong airflow.
At the end of the study, he found that there was hardly any difference in the airflow generation 4, 5, and 6 blades.
Thus, whether the fan has 4 blades or 5, its efficiency would depend on a combination of the number of blades, the blade pitch, and of course, the motor.
How To Install A 4 Blade Ceiling Fan
With the right guidance, it is quite easy to install a 4 blade ceiling fan. Here are the steps for installation:
- The foremost thing you need to do is to turn off the power on the circuit breaker. Then you remove any current fixture that you may have (light bulbs, glass fitters, etc.)
- Check the strength of your junction box. If it can support up to 50lbs, you are good to go. After this, mount the ceiling fan bracket to the junction box.
- Assemble the downrod and the fan blades.
- Hang the motor onto the mounting bracket.
- If the fan comes with a receiver module then install the receiver module into the canopy assembly and tuck it well in the mounting bracket.
- Connect the house electrical wires to the fan and the receiver module. In case there is no receiver module, connect the house electrical wires to the fan’s electrical wires.
- Attach the fan blades to the motor housing. Make sure to tighten the screws properly.