Frequently Asked Questions

1)      How does ventilation works?

The general concept of ventilation is all about moving air from outside of the building to the inside. Using ventilation fan, the fan draws the air out of the building and air natural replaces itself through spaces. Usually ventilation is useful in places where air is unable to replace itself naturally or in areas where air are stagnant. (See why ventilation is useful below)

2) Can I fix up a ventilation fan myself?

If you are trained in electrical installation and equipped with necessary tools, you are able to install it yourself.

3) What are the methods of mounting the ventilation fan up?

The most common and cheapest method of mounting up the ventilation fan would be cutting a hole on the glass window and mounting the fan up itself. However, for such ventilation fans, it has to be a window mount ventilation as there are many types of ventilation fans around. (see types of ventilation fans.)

Other methods would be removing the window pane and fixing up an acrylic board or wooden board to replace the existing window panel. However, if you are staying in HDB, you are not allowed to do this due to HDB regulations. For condominiums owners, you would have to check with your management as in whether the 2 above named methods are allowed.

Lastly, to bypass all the hassle, we will have the customized 15WHPA method whereby we will fix on the ventilation fan on a piece of acrylic that is cut out according to the window size. Thereafter, it will be mounted onto the wall, over the window and effectively covering the window. Air will be ventilated through the window, irregardless the window type.

4) Is my window type suitable for installing ventilation fan?

There are mainly 4 kinds of window type- push out panel (top-hung) , movable louvre, fixed louvre and lastly, sliding window. For all the above methods, we are able to install it using our method as we will be mounting the set on the wall itself rather than the window.
For fixed louvre, (as long as the pane is tilted and there is opening to it) it will not be an issue either as air is a free moving particle and therefore the ventilation fan would be able to draw air out effectively.

5) Is the maintenance of the 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 louvre and press to the catch at each side and the louvre will be removed. As for cleaning the blades, you just need to turn the center cap and the blades and cap will come off.

6) Will it take up a lot of energy?

Based on new charges as of 1st October by Singapore Power, the new electrical tariff is as of 21.38cents KW/H.
Based on calculation 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= 7.70cents
You will be paying 7.7 cents 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 400watts will cost you $61.57 per month.

7) I do not have additional power point in the bathroom. Can I still fix up the ventilation fan?

The electrical source of the ventilation fan would be tapped from the existing source. It can be either from the ceiling lights or the water heater so that when either of the switch is turned on, the ventilation fan gets turn on too.

8) Will it be very noisy?

At 44 decibels, you can be sure that there will be hardly any sound from the engine.

9) What is the difference between a ventilation fan and a normal fan blowing in the bathroom?

Ventilation fan is able to draw air out constantly, throwing out dust, moisture, odor as well as chemical pollutants in the air. Due to the air movement in the room, 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 throwing the air out. However, the fact is that aside from lowering the temperature, air cannot be drawn out effectively as the fan will only throw the air around the room and air will only get out of the room occasionally. Air is being constantly reuse and gets trapped in the room.

10) What is the difference between 15WHPA and other normal propeller fan 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 whereby 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 ventilation 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 ventilation fan, in such case 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 design by KDK for residential purpose and works on high pressure motor.

11) Why do I have to use ventilation fan when I can put a normal fan at my window when it can perform the same task?

Putting 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 ventilation fan. Firstly, its purpose is not to draw out air, but to blow air so 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, like 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 ventilation fan. The stand fan would usually take up 3 times higher electricity as of a ventilation fan and in long term, you will be spending much more instead.

12) How long does it takes to mount up the ventilation fan?

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-customized before the installers come down, no more additional cutting or sizing is needed.

13) I am interested in purchasing a set of ventilation. How do I go about getting it?

You can call up 6288 9190 to request for a consultation whereby our installers can go down to do measurements as well as give you a quotation based on the site evaluation. The installer will look out for includes obstructions, power point, window size and window type. Based on these few factors, the installer will then give you a quotation based on the installation procedure that they will be providing. If you are satisfied with the quotation, you may confirm and schedule another date the with installer, whereby they will come down on another date to fix up the set itself. The customization of the acrylic and spacers will be done back in the workshop, thus saving on installation timing. Click here to sent us an enquiry.

14) How much does it cost to fix up a set?

Each installation charges varies depending on the window size and also other factors such as power points and obstructions. In a normal case whereby the installer is to fix up a normal window size without any obstructions, with existing power point will cost approximately $300 - $400. (Installation cost is charge accordingly after installer’s assessment. Above figure is just a guideline)

15) Is it water proof?

The ventilation fan is splash-proof and also comes with louvre that can block out water being spilled onto the engine. However, it is not water-proof in terms of heavy water spillage or submerging in water.

16) What is the difference between Sensu and 15WHPA?

Both sets are installed using the same way, making use of spacers and plastic sheet to mount up the 15WHPA. In terms of performance, there is no difference as both are using the same ventilation engine. However, the material used to mount up the ventilation set have some differences which you can see in the table below.


Customized 15WHPA


Model of Engine



Spacers Used

Stainless steel

Chrome-plated, brass base

Material of Plastic Board

Acrylic Perspex- 5mm

Perspex- 7mm with Silk Screen Printed Design


Frosted white, opaque white, transparent

Landscape (Green), Contemporary (Grey), Sensorial (Yellow)

Used on window size

Any size

Maximum size of 61cm x 61cm

17) I am living in HDB. Is there any way that I can still mount up the ventilation fan directly onto the glass window?

Yes. You may change the window grills and submit a proposal to HDB for approval that includes the ventilation fan to be mounted on the window itself. Only in such scenario, HDB can allow ventilation to be mounted directly on the glass window pane.

18) I’m staying in condominium, can I install ventilation fan in my home?

Yes. As long as the ventilation fan is installed inwards, and not affecting the aesthetic of the building.

19) Can I still have access to my window if I use the method of customized 15WHPA?

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

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