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How To Determine Fan Blade Pitch

How To Determine Fan Blade Pitch

Whether you’re shopping for a new fan or replacing an existing one, the pitch of the blade is a crucial issue to consider. Don’t worry if you don’t know how to measure blade pitch!

Try one of the following methods for determining fan blade pitch:

  • Using the Angular finder: Place the angle finder as close to the bracket as feasible on the blade’s surface, and it will automatically display the blade pitch.
  • Using the Fan Blade Pitch Gauge: The pitch gauge can be read by fastening it to the center of the fan blade and setting its straight edge flat on the blade.
  • Using the formula [(Height / Width) x 180°] / 3.14159, determine the height and width of the fan blade.

What Is A Fan’s Blade Pitch?

How To Determine Fan Blade Pitch

Blade pitch is the term used to describe the angle at which the fan motor’s blades are connected. This is the angle created by the oblique cutting edge of the blades and the horizontal ground. The blade angle of the ceiling fan has an impact on airflow and cooling.

A higher blade pitch improves airflow. As the pitch of the blades increases, it moves more and more air. Lower pitch blades move less air, but it is scattered across a broader area.

As the pitch increases, so does the airflow, resulting in a more concentrated stream of air that can be experienced across a smaller area.

Other factors influencing a fan’s airflow include the motor, blade shape, blade length, and distance from the ceiling. These elements work together to help the blades overcome drag as they fly through the air.

The motor has the greatest influence on how much airflow may be increased by increasing the blade pitch.

The majority of residential fans are not strong enough to handle the increased drag that higher pitch blades experience.

The blade pitch and motor quality are frequently related. Blade pitch and motor power must coincide for the best outcomes.

What Are The Various Fan Blade Pitches?

The following are some of the several pitches available to fans:

  • 10°–12°: This type of fan, which has a narrow blade pitch and may produce smooth, gentle air circulation, operates at a medium fan speed. It utilizes less power as well.
  • 13° – 15°: This is the most common blade pitch for fans on the market. This blade pitch is appropriate for use in every room of the home. It creates a comfortable air flow in the living room, bedroom, and kitchen.
  • 16° – 18°: This blade pitch produces higher airflow. The fan blades necessitate a stronger motor.
  • 19° – 21°: This blade pitch creates strong airflow. When the blades cut the air, a large, powerful engine is required to overcome the air resistance.
  • 22° – 24°: This high blade pitch is suitable for usage in industrial and commercial settings such as warehouses and factories. Because they are frequently installed at high ceilings, these fans should be able to produce a large amount of cubic feet per minute (CFM). If the blade pitch was too narrow, there wouldn’t be much airflow on the floor.
  • 25°: This is almost the highest pitch available in the fan business. The strong air resistance necessitates a high-quality motor. The ceiling fan would thus cost more money.
  • Adjustable Blade Pitch: The most sophisticated fans have this advanced feature. You may alter the blade pitch for various needs. However, it is not suitable for individuals who are new to fans because the components are more complicated.

How Can I Measure The Pitch of a Fan?

The pitch of the blade is one of the most crucial and challenging to quantify parameters on a fan blade. There are several methods for determining the pitch of the blade, which are discussed below:

Using The Angle Finder

How To Determine Fan Blade Pitch

Take your measurements while the fan is still mounted to the ceiling, if possible. If you must remove the fan, place it on a level surface and make sure the entire device is upright and level.

To establish the blade pitch, place the angle finder as close to the bracket as feasible (but not on it) and align the angle finder’s short edge with the blade’s long edge.

After that, the angle finder will show you the blade pitch in the digital display.

Using A Fan Blade Pitch Gauge

How To Determine Fan Blade Pitch

Use a fan blade pitch gauge to measure the amount of twist a blade has on the hub. Although you can readily identify the blade rotation by glancing at the fan, this specific instrument will also tell you what direction it is rotating.

You merely need to fasten the pitch gauge to the fan blade’s spider to determine the pitch. The flat middle of the fan blade is known as the spider. Next, place the pitch gauge’s straight edge component flat against the blade. The pitch gauge can then be used to read the fan’s angle.

Using Geometry

There may be situations when you do not have access to a fan blade pitch gauge but still require the information. Geometry or manual computation are the other options. To determine the pitch of the fan blade, you must first determine the fan blade’s height and width.

When we talk about the height of the blade, we mean when the fan is flat on the surface. Then, using a measuring tape, measure from the highest point on the blade to the surface. Then determine the breadth of the blade.

You can proceed with the calculation if you already know the fan blade’s height and width. multiply the width by the height. the result by 180 degrees. The pitch of your fan blade can then be determined by dividing it by pi, which equals 3.14159.

To make things easier, the formula is,

Pitch of the Fan Blade = [(Height of the Blade / Width of the Blade) x 180°] / 3.14159

What Pitch Is Best For Fan Blades?

The majority of fans made for home use should have a pitch between 12° and 15°. This is due to the fact that at this pitch, even relatively weak motors may produce sufficient airflow over a broad area.

The proper pitch for commercial and industrial ceiling fans can range from 20° to 25°. These fans, however, are not suitable for use in the home because they are built for air circulation rather than cooling.

What Should You Look For When Buying A Fan?

To choose the ideal one for you, five aspects should be carefully considered. Here are some things to watch for:

Pitch Of The Blade

As previously stated, blade pitch refers to the angle at which the blades are connected to the fan motor. It is critical to determine the adequate pitch since every degree of alignment determines how much air is moved.

A 14° blade pitch fan, for example, moves around 80% more air than a 10° blade pitch fan.

The Direction Of Airflow

Ceiling fans can be rotated either clockwise or counterclockwise. If you turn your fan counterclockwise, the air will be blown directly downward. During the summer, the downward airflow creates a lovely cooling breeze around the room.

If your fan has a higher blade pitch, you might even be able to reduce the room’s “feel” temperature by 8°!

Hot air rises to the ceiling in the winter, though. Therefore, you should rotate your fan counterclockwise to force air from the ceiling outward to bounce off the walls, warming the entire space.

Fan Size

Make sure the fan you choose is the right size. It’s crucial to take the size of the room you plan to place it in into account. Make sure the fan has a smaller fan blade width if you wish to install it in a tiny space. For greatest benefit, larger rooms are best suited for larger fans.

Style Of The Fan

Make sure the fan coordinates with the rest of your decor to make the room look cohesive. A vintage-style fan may not fit in if the rest of your furniture is more contemporary.

Final Reflections

You might notice the blades become bent or deformed as the fan blade pitch changes over time. The fan should be replaced in this case, or the blades if none are available.

You may choose what fan to buy to get the most advantage from it by figuring out the blade pitch using the methods outlined above.

How To Determine Fan Blade Pitch

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Written by HVAC Contributor

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