What is Ventilation?

The general concept of ventilation is all about moving air from outside of the building to the inside. Using a ventilating fan, stale and undesirable air is drawn out and naturally replaced by fresh air that enters through openings in the building. Usually ventilation is useful in places where air is unable to replace itself naturally or in areas where air is stagnant. (See why ventilation is useful below)

Benefits of Ventilating Fan

Primary Benefits

Enhance Air Circulation
  • Poor air circulation results in poor health, reducing productivity, lowering concentration span and causing breathing difficulties.
  • Good air movement in homes ensures bad air is driven out continuously, replacing stale air indoors with a fresh supply of oxygen.
  • Reduce the chances of virus spreading at home when one of the family members falls sick.
  • Poor air circulation is the main cause for "Sick Building Syndrome".
Lower the risk of indoor pollution
  • Indoor pollution is caused by the emission of gases from household chemicals such as detergents and cooking gas as well as smoke.
  • Air is locked indoors and cannot escape.
  • Family members face health threats in the long run. For example: Asthma, Lung problems.
  • Furniture and home fittings will deteriorate faster as these chemical gases will corrode and cause chemical reaction.
    For example: Peeling of wall paint.
Some causes of indoor air pollution
  • Pets' fur and allergens that are trapped indoors
Reduce moisture level in bathroom
  • Moisture will encourage growth of mould and mildew.
  • Mould will grow on installations and walls, in the false ceiling, shower screen area (black cavity). These cannot be removed.
  • Mould and mildew will also spread onto the towel and hand towels (black dots). These cannot be removed.
  • Mould is unsightly and causes wallpaper and paint to crack. The mould will also damage the installations.
  • In a worst-case scenario, there might be growth of toxic mould which will pose a threat to human health. In some situations where growth of mould gets out of hand, the house might have to be quarantined.
  • Humid environment also encourages the growth of pests and vermin at home.
Reduce the growth of house mites
  • In Singapore, the growth of vermin such as dust mites in the home is common.

Choose the right Ventilating Fan

Step 1
Determine the room size: Length x Width x Height (in metres).
Example: 4 x 4 x 3 = 48m³

Step 2
Determine Air Change Per Hour (ACH) in your designated area. Refer to table below.
Example: I am choosing a ventilation fan for public toilet. Based on the table below, the figure is 20.
I: Type of Room II: Necessary frequency of ventilation per hour
  I II   I II
Hotel Dance Hall 8 Photo Studio Darkroom 10
Dining Hall 8 School Laboratory 6
Kitchen 15 Cooking room 15
Hallway 5 Auditorium 6
Toilet 5 Gymnasium 8
Lavatory 10 Toilet 12
Boiler room 20 Library 6
Laundry 15 Classroom 6
Hospital Operating Room Waiting room 10 Theater Auditorium 6
Clinic 6 Hallway 6
Ward 6 Smoking room 12
Bathroom 5 Toilet 10
Office 6 Projection booth 20
Restaurant 8 Workroom 6
Kitchen 15 Telephone switch board room 6
Gallery 5 Factory Painting room 20
Toilet 10 Dynamo room and substation 20
Boiler room 10 Condenser room 15
Laundry 15 Office 6
Operating room 15 Restaurant & Snack Bar Restaurant 6
Disinfecting room 12 Library Reading room 6
Rooms for patients receiving medical treatment for diseases of respiratory organs 10 Office building Office 6
Public Toilet   20 Waiting room 10
Home Kitchen 15 Conference room 12
Living room 6 Display room 10
    Toilet 10

Step 3
To calculate air flow required: Room size x Figure indicated in the table
Example: 48 x 20 = 960cmH

Step 4
Select the type of fan, such as wall or window-mounted; or non-ducted fan based on installation method, application and site requirement.
Example: A wall-mounted fan is selected based on site conditions.

Step 5
Selected model must be equal or higher than the calculated airflow of 960cmH
Example: 2 numbers of KDK model 20ALH are selected based on 50Hz parameter delivering 546cmH each. Hence total air flow is 1092cmH, well exceeding 960cmH.

FAQ of Home Ventilation

1. Can I install the ventilating fan myself?
     If you are trained in electrical installation and equipped with necessary tools, you are able to install it yourself.

2. What are the methods mounting the ventilating fan?
     The most common and cheapest method would be to cut a hole in the glass window before mounting the fan. However, this is limited to
     window-mount ventilating fans.

     Other methods include replacing the existing window pane with an acrylic sheet or wooden board.
     However, this is not approved for HDB flats. For owners living in condominiums, please check with the management to see if the 2
     abovementioned methods are allowed.

     A unique and hassle-free method is to install 15WHPA ventilating fan on an acrylic sheet cut to the size of the window. This is mounted
     onto the wall, over the window – effectively covering the window. Air will be ventilated through the window, regardless of window type.

3. Is my window type suitable for installing a ventilating fan?
     There are mainly 4 window types, namely, push out panel (top-hung), movable louver, fixed louver and lastly, sliding window. For all the
     above methods, we are able to install it using our customised method as we will be mounting the set on the wall itself rather than on the
     window. Ventilation is possible even for fixed louver windows as long the window panes are tilted open.

4. Is the maintenance of the ventilating fan difficult?
     The maintenance of the fan is similar to that of a stand fan. You just need to unscrew the two ends of each louver and press to the
     catch at each side and the louver will be removed. As for cleaning the blades, you just need to turn the center cap and the blades
     and cap will come off.

5. Will it take up a lot of energy?
     Based on new charges as of 1st October by Singapore Power, the new electrical tariff is at 21.38cents KW/H.
     Based on calculations that our ventilation fan runs on 15W/H:

     21.38cents X 15/1000 = 0.32cents
     Thus, you will be paying 0.32 cents running the ventilation fan per hour.

     0.32cents X 24hours= 7.7cents
     You will be paying 7.7cents to run the ventilation fan per day.

     7.7cents X 30days = $2.30
     You are paying $2.30 per month to run the ventilation fan continuously.

     A normal refrigerator running continuously 400 Watts will cost you $61.57 per month.

6. I do not have an additional power point in the bathroom. Can I still install a ventilating fan?
     The electrical source of the ventilating fan would be tapped from the existing source. It can be either from the ceiling lights or the water
     heater so that when either one is switched on, the ventilation fan gets turned on too.

7. What is the difference between a ventilating fan and a normal fan blowing in the bathroom?
     Ventilating fan is able to draw air out constantly, removing dust, moisture, odour as well as chemical pollutants in the air. Due to the
     air movement in the room, the temperature will be cooler.

     As for a normal fan or wall fan blowing inside the bathroom, there is a misconception that by blowing the air around the room, one can
     achieve the effects of lowering the temperature in the room as well as drawing air out. However, the fact is that aside from lowering
     the temperature, air cannot be drawn out effectively as the fan will only move air around the room and air will only get out of the room
     occasionally. Air is being constantly reused and gets trapped in the room.

8. What is the difference between 15WHPA and other normal propeller fans in the market?
     Usually what you can find in the market is a normal propeller fan that can perform effectively under normal air pressure, drawing air from
     one place to another. However, in cases where the room is above ground level or in special circumstances that the air pressure in one
     room is very much different from the other, a high-pressure ventilating fan would need to be in place to draw the air out instead. This is
     due to the fact that a normal propeller fan would not be able to draw air out effectively and perform normally under pressure, causing
     it to malfunction after a period of time. 15WHPA, a high-pressure ventilating fan, would excel and perform its task of drawing
     air out and maintaining the air volume drawn out constantly without being overheated. It is also specially designed by KDK for residential
     purpose and works on high pressure motor.

9. Why do I need to use a ventilating fan when I can have a normal fan at my window when it can perform the same task?
     Placing a normal stand fan or table fan at your window to draw air out of the room would no doubt be a solution but it will not be as
     effective as a ventilating fan. Firstly, its purpose is not to draw out air, but to blow air as in the case of a normal fan, thus it will perform its
     task of performing greater air throw and wider air spread rather than concentrate on drawing higher air volume. Secondly, as mentioned
     in the case of 15WUD (window mount propeller fan), in the case of high pressure environment, it will not be able to perform up to standard
     and may malfunction over time. Lastly, the energy consumption is not as cost effective as a ventilating fan. The stand fan would usually
     use 3 times more electricity than a ventilating fan and in long term, you will be spending much more instead.

10. What is the time taken to install a ventilating fan and how much does it cost?
       Generally installation will take 30minutes to 1 hour, depending on the power points and other factors. As the acrylic and the spacers
       have been pre-customised before the installers come down, no more additional cutting or sizing is needed.

       Installation charges vary depending on the window size and also other factors such as power points and obstructions. For a typical
       installation – normal window size without any obstructions, and tapping on existing power point – the cost is approximately $300 - $400
       (use this as a guide, the final cost is dependent on the contractor's assessment).

11. I am living in an HDB flat. Is there any way in which I can still mount the ventilating fan directly onto the glass window?
       Yes. You may change the window grills and submit a proposal to HDB for approval that includes the ventilating fan to be mounted on the
       window itself. Only in such a scenario will HDB allow the ventilating fan to be mounted directly on the glass windowpane.

12. I live in a condominium, can I install the ventilating fan in my home?
       Yes. As long as the ventilating fan is installed inwards, and does not affect the aesthetic of the building.

13. Can I still have access to my window if I use the method of customised 15WHPA?

       Yes. You may still clean the window and close it as and when you like as there will be enough space between the acrylic sheet and the
       wall for you to access the window.

How to choose a ceiling fan?

Choosing a ceiling fan location
Fan should be placed in the centre of the room, unless the space is too large and require 2 or more fans for better airflow. For safety reasons, we recommend to avoid installing a fan directly above a bed.

Depending the room size
A large bedroom or living room would require a large ceiling fan (blade length: 56 to 60 inches) to move the air effectively. For smaller room, fan blade length between 44-56 inches will be adequate. However, the size of the fan also depends on individual needs.

Mounting measurements
A ceiling fan needs to be 2.3 – 2.8metres, from the floor, with the blade tips at least 0.6metres away from walls or tall furniture. If you're using more than 1 ceiling fan, do ensure to install them 3 metres away from each other (distance between the downrod).

Ceiling height
Room with high ceiling requires a more powerful fan to promote air circulation. Ideally, a ceiling fan should be at least 2.3 – 2.8meters from the floor.

In situations when the ceiling is extremely high, extension fan down rod can be used. A general formula for calculating down rod length is to take the ceiling height less 2.3 – 2.8metres. Example, if your ceiling height is 3.65metres, after deducting 2.3metres (from the floor), the down rod required is 1metre long.

Good Installation Practice for Ceiling Fan

Before Installation

1. Read and understand the Instruction Manual.
    Different models require different installation methods. Consult your dealer or sales person if in doubt.

2. Inspect the contents of the box.
    Check that contents are in good condition and there are no missing parts or defects that can cause installation problems.
    Ceiling hooks and bolts can be purchased from KDK Service Centre. Mounting plate for M11SU will be supplied. Refer to Spare Parts page for
    more details.

During Installation

1. Tighten bolt/nut between motor and pipe firmly.
    Failure will cause wear and tear due to jerking effect.

2. Ensure bolt/nut (rubber suspension) is not overtightened.
    Rubber suspension is supposed to absorb vibration during operation of the ceiling fan.

3. Safety Wire is fixed as Installation Guide.

    Safety wire secures the fan motor to the ceiling fan hook.

4. Do not mix blade if you are installing more than 1 model at the same time.
    Each set of blades is meant for that particular model. Mixture of different blades will cause ceiling fans to wobble.

5. Fix the motor complete with blade before fixing to pipe.
    Bended blade causes wobbling.

6. Ensure canopy does not touch the ceiling.
    It will cause noise, wear and tear if the canopy is scratching against the ceiling when in use.

7. Follow wiring instructions.
    Connect power supply according to the wiring Instructions.

After Installation

1. Ensure all screws/nuts are securely tightened.
    To ensure safety.

2. Do not clean the blade by pulling blade tip.
    Blade will bend when excessive force is exerted, resulting in wobbling.

3. Ensure height of blades after installation is maintained within 1mm.
    Measure the distance using a measuring tape. Adjust all blades to ensure equal distance from ceiling to the blade tip, within 1mm tolerance.
4. Final checking and inspection.
    Check and inspect the ceiling fan for shaking, abnormal sound and vibration when in operation.

5. Fill up your warranty card and mail it back to us.
    To ensure the actual warranty period should any matter arise in future.

6. Find out more about the After-Sales and Service Centre.

How to prevent Ceiling Fan from Wobbling

What causes Ceiling Fan to wobble? How to prevent this?
Difference in blade weight Ensure the weight stated on each blade is the same before installation
Difference in height of blade tip Change new blade or re-adjust the height of the tip with a measuring tool
Pipe Length is shorter than standard Use the standard pipe for the right model
Loose screw at the shaft and pipe Tighten the screw securely
Screws between hook and rubber suspension (absorber) is too tight Loosen the screw slightly because the rubber suspension is supposed to absorb vibration during operation of the ceiling fan
Motor not balanced Do not mix the blades during installation if you are installing more than 1 unit
at the same time

What are the different types of KDK Ceiling Fans available?

  • Standard with 3 blades and using regulator control: Model M48SG & M60SG
  • Hugger type with remote control: Model M11SU (suitable for HDB)
  • Designed for high ceiling with remote control: Model M56SR
  • Thermal Sensor function with remote control: Model Z60WS, V60WK, V56VK (suitable for low-ceiling apartments)
  • All KDK ceiling fans are equipped with the World's 1st Patented Safety Plate that prevents fan blades from falling off and the ultra-secure Cut-off Safety Switch that includes Safety Wire and Thermal Safety Fuse to protect against current surge.

Patented Safety Features for Ceiling Fans

KDK takes reliability to the next level with the World's First Patented Safety features. With these 2 amazing features – Safety Cut-off Switch and Safety Plate, KDK offers peace of mind like never before!

1. Patented Safety Cut-off Switch
    The Safety Cut-Off Switch features a lever to cut off power supply automatically when dangerous wear and tear of the shaft and bolt
    is detected.

2. Patented Safety Plate
    Safety Plates hold the blade to the motor and prevent the blade from falling off during wear and tear.


3. Safety Wire
    The Safety wire is adopted to secure the fan motor with the ceiling hook that prevents falling of the motor when detaching the fan motor
    from the pipe rod occurs.

4. Thermal Safety Fuse
    It protects the fan motor against current surge.

FAQs for Ceiling Fans

1. How much air do ceiling fans move?
    Ceiling fan air movement is measured in CM/HR or cubic metres per hour. The greater the CM/HR, the more air is being moved. The air moved
    by the fan creates a wind chill effect that makes you feel more comfortable in a warm room. There is a direct relationship between air
    movement and comfort – the more air moved, the greater the wind chill effect.

2. Is ceiling fan energy saving?
    On average, a ceiling fan on high speed will consume less power than a 100-watt light bulb.

3. Can the ceiling fan be installed on the false ceiling?
    It is recommended for all ceiling fans to be installed on concrete ceiling for maximum safety. However, should you need to install on false
    ceilings, the contractor must ensure that additional structural support must be provided for, taking into account the safety load of the fan.

4. Which ceiling fans are suitable for HDB or low-ceiling apartments?
    For low-ceiling apartments, we would recommend M11SU or V56VK. However, room size will be the deciding factor.

5. Can a dimmer switch be used for ceiling fan?
     No. A dimmer switch will burn out the fan's PCB control board.

6. My ceiling is designed with L-box, can I still install a ceiling fan?
    Yes. Ensure that the blades are placed lower than the L-box and are positioned at least 3 feet from the tip of the blade to the wall to
    allow air to be thrown down effectively.

7. Can we install ceiling fan within the ceiling dome?
     It is not recommended as it will cause air turbulence resulting in noise problem and vibration.

8. Does Capital Distributors provide installation?
    No, but our authorised dealers do provide installation service. Also, we can recommend our reliable and trusted installers who are trained in
    installing KDK ceiling fans.

9. How to maintain or clean the ceiling fan?
    It is best to hire a professional/cleaning expert for annual maintenance. A well-maintained ceiling fan can last a lifetime. Cleaning is one of
    the important factors as dust tends to collect on the blades and the motor housing. With time, it will collect inside the latter which makes
    the motor work harder and wear out over time.

What is 1/f Yuragi technology and how does it benefit the consumer?

Thermal Sensor models V60WK, V56VK and Z60WS from our remote control series are equipped with 1/f Yuragi function. This feature delivers comfort and relaxation by varying air velocity to create gentle, fluctuating 'natural breeze'.

What is Thermal Sensor function and how does it benefit the consumer?

The Thermal Sensor detects any change in room temperature and responds by automatically adjusting fan speed to provide enhanced comfort. Models V60WK and V56VK are equipped with this innovative function.

What is the warranty period for KDK fans?

Warranty protects against manufacturing faults for 12 months from the date of purchase such as spare parts.
Warranty does not cover the following; not limited to:

  • Damages resulting from incorrect installation to wrong mains voltage
  • Repair/service for installation of more than 3.8 metres in height from floor level.
  • Finishes, consumables such as batteries, remote control, fan blades/guards and regulators
  • Use, other than in accordance with the instructions for operation
  • Transport and labour charges
  • Faulty installation or mishandling
  • Scratches, corrosion, rust, colour deterioration and stains
  • Obstruction caused to access electrical parts/products
  • Cleaning, reconditioning and lubrication
Warranty is valid only in respect of KDK products bearing the PSB safety mark stickers and models belonging to the Singapore Market and sold by Capital Distributors (S) Pte Ltd to its authorised dealers.

Why remote controlled ceiling fan cannot be installed with dimmers or regulators?

Regulators & dimmers are used to adjust the speed or brightness of the appliances. For example, in order to reduce the speed of the ceiling fan, the regulator will be adjusted to a lower speed by increasing the resistance. Hence, reducing the voltage causes the fan to operate over a range of reduced speeds.

If the remote controlled ceiling fan were operated using dimmers / regulators, electronic components such as the PCB will be used to control the speed instead.

Therefore, it will cause the temperature of the components to rise. After usage for a period of time, the components will eventually become defective and thus causing the ceiling fan to be not working.