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Determining which sort of fans, you can add to your room can seem like a remarkably complicated decision when you start. You have to know the room dimensions, fan height, airflow metrics, the length and number of blades, their materials, and more.

How To Choose Between Fan Sizes?
The first thing to remember when determining the size of the fan is the room's size where it is going to get installed. A room's square footage determines how big the fan needs to be, as the air cannot be adequately circulated by a fan that is too big or small for a specific area.
If you don't already know this, you can calculate the scale of a fan by measuring the diameter of the blade sweeps, or straight across from the tip of one blade to another. If there are odd numbers of blades on your fan, then measure it from one blade's tip to the fan's centre and double the amount for your calculation.
Once you know the measurement of the size of your fan, you need to calculate your room size.

Fan Size

Room Size

Room Type

29" or less

Less than 50 Sq. Ft

Hallway, Laundry Room

36"

Up to 75 Sq. Ft

Large Bathroom, Breakfast Corner

42"

Up to 100 Sq. Ft

Bedroom, Office or Kitchen

52"

Up to 225 Sq. Ft

Patio, Master Bedroom, Dining Room

56"

Up to 400 Sq. Ft

Living Room, Hall Room

In bigger spaces, depending on the room shape, you can also go with two small fans. When you match the size of a fan to the size of your room, a minimum of 18" to 24" of a clear area, on all sides of the fan, is what you need.
Room size is critical because if the fan is too small for your room, it will not circulate the air efficiently. Whereas, if the fan is too big for your room, then it might feel like you are in a wind tunnel.

Hanging Height
The fan's bottom needs to be kept at least 7 feet above the floor to meet the building codes guidelines. But the ideal height is eight to nine feet as it allows optimal ventilation. You may use fans that come with a down rod to achieve the ideal height for higher ceiling fans. More space between the roof and the fan blades delivers better flow and movement of air. Ideally, a target for 12 inches or more is perfect, when it comes to the hanging height.

Ceiling Types: The types of ceilings in terms of choosing a fan, can be categorized into two different groups, such as the low ceiling fans and the average or high ceiling fans.
Let us understand them better below:

Low Ceiling Fans: As the name suggests, low ceiling fans are built for rooms with ceiling height that is a maximum of eight feet or shorter. As its name suggests, these low ceiling fans' clasp' to the ceiling/roof. Since the ceiling height is short here, you can use mounted fans that do have any down rods.
Average & High Ceiling Fans: If the ceiling of the room is nine feet higher or above, then it is best to hang a fan that has down rods in its design. A down rod can range from up to 3 to 72 inches in length. Down rods are used to suspend the fan from the ceiling or roof and are an ideal choice because it allows more space between the ceiling and the fan blades, resulting in better circulation of air. Typically, most fans come packed with different standard lengths of one or two down rods. However, if you need more length to reach the ideal hanging height, you can purchase additional down rods in other sizes as well. For rooms that have a 9-foot ceiling, you can choose a fan with a 6" down rod.
Similarly, for taller ceilings that are above the nine feet mark, you can add a 6" increase to the down rod for every foot increase in height. For instance, if there is a 10-foot ceiling, then use a 12″ down rod. If the height of your ceiling is 11-foot, then you can use an 18″ down rod. It is pretty simple as all you need to remember is for every increase in the height of the ceiling, add 6" inches of height to your down rods.

How Does A Fan Work?
In the simplest of terms, a fan works by rotating its pitched blades. The rotation of blades creates the airflow that produces air circulation that provides a cooling effect.
There are multiple different factors put into the functionalities of a fan. You, now, already know how to measure the size of your fan to your room. The next few pointers will help you understand the various ways in which you can control your fan, its airflow, CFM, and the reason why DC Fans have become more common.
Ceiling Fan Controls: There are three different ways to operate and control a fan, namely:

What Are CFM And Airflow?
Airflow is the quantifiable measure for the amount of air a ceiling fan provides. Whereas, CFM (Cubic Feet Per Minute) is a unit in which the airflow is measured. When a fan is rotating in its highest capacity, that specific number gets divided by the number of watts it consumes to arrive at the CFM measurements. There is a direct relation between CFM and energy efficiency, as higher CFM means higher efficiency and effectiveness of air circulation. According to Energy Star Requirements, 75 cfm/w is to be considered as the minimum value for a fan's energy efficiency level.
The Environmental Protection Agency has made it mandatory for all manufacturers of fans to place the below-mentioned table on all their product boxes, catalogues and brochures to enable a better understanding of the power consumption of each product. The information varies from product to product.

ENERGY INFORMATION At high speeds

Airflow

Electricity Use

Airflow efficiency

7,780 Cubic Feet Per Minute

26 Watts(excludes light)

285 Cubic Feet per Minute Watt

With just a glance at the information, you get a clear idea about a fan's efficiency level and airflow. It also makes it easier for consumers to compare different fans before they buy one.

So, What Is the Ideal CFM? At high speeds

Good CFM Range

4,000-5,000

Better CFM Range

5,000-6,000

Best CFM Range

Over 6,000

DC (Direct Current) Motor Fans:
A DC motor fan transforms electrical energy into mechanical energy by drawing in direct current. They are a little costlier than regular fans as they require expensive electronic speed controllers. However, the benefits that DC motor fans bring make up for the cost. Some of the benefits of DC motor fans are as followed:

  1. Effectively silent operation
  2. Smaller efficient motors result in compact and lighter
  3. Prolonged fan life due to efficient use of energy
  4. Faster start up speed resulting due to higher torque
  5. Up to six different speed controls

Typically, if the DC motor fans have the lighting feature, they utilize LED lights, further adding to the efficiency level of the fans.

How To Choose The Right Fan Blades?
The number of fan blades is another essential factor in determining the kind of fan to purchase, but this has become less of a function matter and more of personal preference with technical advances.
In the past, fans with five or six blades will be more efficient as compared to a fan with three or four blades, but it is no longer the same. As the CFM is the metric for the airflow efficiency of a fan, the number of blades is more closely linked to enhancing the interior design of a room. For instance, a fan with four or five blades will provide a more traditional, classic look when compared to a fan with two or three blades gives a modern and sophisticated look.
Types of Fan Blade Finishes:

What Are the Different Types of Fans and Their Purpose?
Luminous mainly offers three different types of fans, each with different specifications and purposes. You can buy fans online or from a store. Take a look below:
Ceiling Fans: At Luminous, our ceiling fan product line has multiple variants under it, such as aspiration series, decorative premium series, deco classic and performance series.
Specification:


Purpose: The primary purpose of ceiling fans is to allow ventilation and increase air circulation to make you feel more relaxed and cooler by utilizing the velocity of air.
Portable Fans: The portable fan has several kinds that range from wall-mounted fans, table fans, and personal fans.
Specification:
Purpose: Luminous portable fans are thin, portable in size and are simple to hold. They can be mounted on walls, chairs, tables or countertops. Our portable fans are ideal for cooling of personal spaces. They are affordably priced and provide efficient cooling. Portable fans have an adjustable height for ease of use. Most have oscillating heads oscillating to enable better air circulation. At Luminous, our range of portable fans also offers you the option of oscillating and non-oscillating models in multiple sweeps.
Exhaust Fans:The exhaust fans are usually used for kitchens and bathrooms as they help in ventilation. These exhaust fans are made with either plastic, axial or metal.
Specification:
Purpose: Luminous ventilation or exhaust fans significantly reduce problems that are caused due to extra moisture, prevents paints from peeling off the wall, warping of doors and accumulation of mould spores. Exhaust fans extract and expel polluted/ stagnant air and odour from the toilets or closed spaces, making it a must-have product in every household.

FAQs:

1.What are DC Motor fans?
DC motor fans are a new addition to the family of fans that can generate additional torque and consumes lesser than 70% power of a typical fan. The mechanism behind it is DC motor fans transform electric energy into mechanical energy while rotation.

2.How to select the right sweep size?
Ventilation or exhaust fans are to be chosen based on their capability to circulate air, which depends on the room size.

3.What are the sizes of down rods available from?
At Luminous, the length of our down rods for fans are:
-In Utility Models: 220 mm (8.6 inches approx.)
-In Performance or Premium models: 275 mm (10.8 inches approx.)
When assembled, the distance between the fan blades and the ceiling ranges from 455 mm (18 inches) to 510 mm (20 inches) relatively.

 
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