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View Full Version : Better air circulation...4 blade or 5 blade fans?



jayded
08-02-2008, 06:36 PM
Guys,

been comparing KDK and panasonic. In terms of better air circulation and speed, which is better? Forget the yuragi..too expensive. Currently using KDK 3 blade..the normal one la but if sit a bit far cant feel the air at all :(

Pls advise...thank u.

bslee
08-02-2008, 06:50 PM
Guys,
but if sit a bit far cant feel the air at all :(
Pls advise...thank u.

If not mistaken KDK and National are from the same factory, albeit different brand badge. Contrary to some thoughts, its not entirely the number of fan blades that determines its effectiveness. The distance from blade to ceiling is to a lot of effect on its actual performance. You may have to increase the distance with longer column pole. The supplied one is only a compromise for most situations.

GreenBug
08-02-2008, 08:12 PM
BS Lee is right... it doesn't matter whether its 3, 4 or 5 blades but there must be good distance between the blades and the ceiling.

As for brands, there isn't any difference anymore. National is Panasonic is KDK. All okay.....

pucman
08-02-2008, 09:35 PM
How about Alpha fan ?

One of the shop recommend alpha fan saying it is lighter and better than national.

Any comments ?

jayded
08-02-2008, 09:39 PM
thanks guys for the kind reply,

But my house is a small appartment...i cant go too low with the fan..u know what i mean?

which mean you're saying that 4 blades and 5 blades basically going to give u the same ammout of circulation and speed??

But they are surely better then those 3 blades one right? i notice that there is an aerodynamic design for those 4-5 blade fans. i thought the shape of the blades are the ones that actually make a difference....

GreenBug
08-02-2008, 09:56 PM
thanks guys for the kind reply,

But my house is a small appartment...i cant go too low with the fan..u know what i mean?

which mean you're saying that 4 blades and 5 blades basically going to give u the same ammout of circulation and speed??

But they are surely better then those 3 blades one right? i notice that there is an aerodynamic design for those 4-5 blade fans. i thought the shape of the blades are the ones that actually make a difference....

If you live in a small apartment, any 3, 4 or 5-blade fan is good enough. Get a reliable brand and have it installed well. As for the blades, by now every brand has the same design... the market is very competitive and up-to-date so any innovation by anyone of them would have been copied by now. Don't worry too much about this my friend, enjoy the air ciurculation.

tryagain
09-02-2008, 05:02 AM
surprisingly alpha fans is more expensive compare to Panasonic or KDK.
I install myself about 30 ceiling fans already due to shifting from houses.
Nope, the alpha fans is not much better than Panasonic.

The remote control fan for both Alpha and Panasonic have 3 speed. The low speed is slow really, the middle is fast. My wife do not like it.

The manual electronics regulator have 5 speed and this give a better control.

Then there other brands I used before twister etc.

I do not know why remote control fan got only 3 speed.

racheljansz
09-02-2008, 10:29 AM
.. is a small appartment...i cant go too low with the fan..u know what i mean?...Since your ceiling is low and it is a small apartment, have you consider wall fan as as alternative.
Had a relative who had low ceiling, narrow side wall and his hall is long, so he fix 2 small wall fans and an air-con in between them. Results was very good - cool gentle breeze all round. He run the fans on low speed and air con setting at 25 Celsius.

besitai2007
09-02-2008, 11:09 AM
Go to http://www.hometips.com/hyhw/electrical/27fans.html for further infor :)

CS Chua
09-02-2008, 11:59 AM
Since your ceiling is low and it is a small apartment, have you consider wall fan as as alternative.
Had a relative who had low ceiling, narrow side wall and his hall is long, so he fix 2 small wall fans and an air-con in between them. Results was very good - cool gentle breeze all round. He run the fans on low speed and air con setting at 25 Celsius.
That is the way to go. The air con reduces the humidity and the fan keeps the air well circulated. A must for apartments in the Malaysian weather. Some friends of mine even put an aircon in the kitchen so the whole unit is basically cool and nice through out the whole day.

fRaNkY
09-02-2008, 01:27 PM
Since your ceiling is low and it is a small apartment, have you consider wall fan as as alternative.
Had a relative who had low ceiling, narrow side wall and his hall is long, so he fix 2 small wall fans and an air-con in between them. Results was very good - cool gentle breeze all round. He run the fans on low speed and air con setting at 25 Celsius.

I find wall mounted fan are more effective since table fan and floor stand fan can limit the space and a bit dangerous when kids are around.

Alternate to airconds, I got a ventilation fan mounted on the ceiling in the bedroom :D

besitai2007
09-02-2008, 03:03 PM
That is the way to go. The air con reduces the humidity and the fan keeps the air well circulated. A must for apartments in the Malaysian weather. Some friends of mine even put an aircon in the kitchen so the whole unit is basically cool and nice through out the whole day.
:) People who aircon their whole house including their kitchen can surely afford the high electiricty bill. But is it a good idea? When you cook, the oil gets vaporised and they recondense inside the aircon cooling fins and jam them up. Possibly they have a hood to absorb all that oily fumes. The hood I have over my stove gets jammed up very fast and needs constant cleaning. Guess our food is too oily. Ah well if money is no object anything also can. :rolleyes:

firefox
09-02-2008, 03:06 PM
For nowdays homes ceilings fans are not practical, i have opted for stands fans for most of my rooms ...these fans are mobile and you can direct it where you want it. Important you buy the sturdy ones so that they dont rattle and vibirate.

bslee
09-02-2008, 03:37 PM
Talking about the merge of our Asian living habits and western type designed homes, having a home designed and decorated like western style doesn't blend well with Asian living trends or habits like in condos and many "modern" homes
Some of the issues we got to contend with.
1. Many people still want to "tai chow" their dishes and a wet kitchen is simply most appropriate. The condo kitchen is mostly cramped and void of good air circulation. WHole house can smell after cooking. Kitchen hood actually do little, unless it appropriately ducted out.
2. People still insist on drying clothes in the sun or open air, thats why we'd see clothes hanging out of flats and high rise.(there's exclusions of course). The clothes dryer IS the solution, but people are NOT prepared to pay for the dryer and energy bills that'll cost you.
3. Electricity is actually expensive here and the bills for air con and dryer can make you hit the ceiling..there's a price to pay here for staying cool. I think most would DREAD to sleep comfortably in their bedrooms WITHOUT air con.
4. Live in a condo, and you'd have to pay "EXTRA" for parking lots for your extra cars. One can go to some terrace home roads at nite and see the road SO NARROW because most people own more than 2 cars..sometimes up to 5 per home and often parked by the roadside narrowing the access. I LOATH visiting anyone along THAT kind of area.
Getting back to air con or fan subject.. our air-cons actually get VERY FILTHY in 6 months time or less.

starrnorth
10-02-2008, 01:56 AM
i think for a small apartment it is better to aircon the place. A fan may be too noisy. Besides with the low ceiling you will not get much circulation, but more noice.

Amanda
10-02-2008, 11:15 AM
have you tried baby fan... saw some nice baby fan sold in the market. KDK has a cute baby fan but i think the price is a bit expensive. about RM340-350 and according to the dealer the motor is not as good as the local made fan like alpha, euro uno, elmark, etc. Local made fan has a bigger motor. (dunno how true is it lar, anyway i just listen). There's also a cheaper wan which cost about RM180 (42 inch, 5 blades with remote - the one that we are using). It helps a little bit for a low ceiling apartment. For small apartment, i believe the wind & circulation produce by 42" fan is more than enough.

hhtee
10-02-2008, 11:22 AM
I think 4 blade or 5 blades cannot tell you which one have a better air circulation.

For instance if the 4 blade is rotating very fast while the 5 blade rotates very slow, then of course the 4 blade has better air circulation.

I believe there must be something in the box that says this fan can rotate "how many revolutions per second".

Let's say both rotates X revolution per seconds then I would suppose the 5 blade one is more efficient.

If the 4 blade rotates Y rev per second and the 5 blade rotates Z rev per second, I would think you need to use ratio to compare because we have different variables here i.e. the blade and rev. per second. hence your ratio would turn out to be something like "how many revolutions per blade". finally, you can chose the one with the higher revolution per blade to determine which is more efficient.

that's my view

oh, don't forget about cost. See which one uses more Watt. Now, you have 3 variables. i.e. cost, revolution and blades :)

if you wanna split more hair, you need to also compare the length of the blade. If the four blade one is so short and the five blade one is very long, it would also effect the amount of air circulation.

WOW! choosing fan is so complicated lah.

chanseng738
10-02-2008, 12:12 PM
I do not know why remote control fan got only 3 speed.

this is probably due to the digital control :- 00 - turn off, 01 - low speed, 10 - medium speed, 11 - high speed

they only use 2 bits to control the speed of fan, thus max possible is 3 speed only.

jayded
10-02-2008, 02:50 PM
Thanks everyone for all the feedback...u guys are so nice...dapat lots of ang pao ah chinese new yr? :D

now, i have thought about wall fans. but then again, u have to do wiring and all which might even make the house look not nice since it is not concealed. I know ultimately it would be good to get an air cond. But then again, budget and i ask myself do i really need an air cond for a small hall?

amanda, i did see the baby fan. but i dont think it's practical for my hall though it looks kinde cute. and it's expensive.

i think the only brands i'm going to go for (since they are trusted) are KDK and panasonic.

one more question, these 4 blade or 5 blade fans, can we use a shorter holder? i'm afraid they don't have shorter holders like for those 3 speed fans. If i use back the original which is quite long, i might some someone's head chopped of by the blade!!

jayded
10-02-2008, 02:52 PM
o ya..the other day my friend said...use the 3 blade only...5 blade lousy one...vely slow!!

i'm confused.... :confused:

bslee
10-02-2008, 03:05 PM
i think the only brands i'm going to go for (since they are trusted) are KDK and panasonic.

one more question, these 4 blade or 5 blade fans, can we use a shorter holder? i'm afraid they don't have shorter holders like for those 3 speed fans. If i use back the original which is quite long, i might some someone's head chopped of by the blade!!

Those 2 brands are widely distributed and available at most shops, thus its value, reputation and likely 1st choice.

I've already made mention earlier, there's a minimal distance between blade and ceiling must be maintained. If that fails, install a wall mounted fan. Blame your house developer for being stupid or a flawed interior design by providing you with a lower ceiling than most others.

Please note that owners who choose to install plaster ceilings also lower the room ceiling height. Should the owner insist on fans, one have to take all what I've said into consideration too. I'm assuming most people would have air con anyway.

BTW, if the fan is abnormally too slow, its mostly the fan regulator thats at fault. Replacing it would normally fix the problem. Other than that.. REPLACE THE WHOLE FAN itself if one thinks its full of problems.

Amanda
10-02-2008, 08:22 PM
some brand come with a shorter rod. im not sure about kdk or pana. elmark comes with a shorter rod. i think 2 inches shorter. however, you can cut the rod but make sure you maintain the original size of the hole at the tip of the rod. Otherwise, your fan will goyang... looks like its going to drop :D , especially at low speed.

nowadays, technology is so advance. its very easy to manufacture a fan.... other brands are also ok.... dont have to limit to only kdk or pana. otherwise your selection will be very limited.


Thanks everyone for all the feedback...u guys are so nice...dapat lots of ang pao ah chinese new yr? :D

now, i have thought about wall fans. but then again, u have to do wiring and all which might even make the house look not nice since it is not concealed. I know ultimately it would be good to get an air cond. But then again, budget and i ask myself do i really need an air cond for a small hall?

amanda, i did see the baby fan. but i dont think it's practical for my hall though it looks kinde cute. and it's expensive.

i think the only brands i'm going to go for (since they are trusted) are KDK and panasonic.

one more question, these 4 blade or 5 blade fans, can we use a shorter holder? i'm afraid they don't have shorter holders like for those 3 speed fans. If i use back the original which is quite long, i might some someone's head chopped of by the blade!!

hhtee
11-02-2008, 09:13 AM
this is probably due to the digital control :- 00 - turn off, 01 - low speed, 10 - medium speed, 11 - high speed

they only use 2 bits to control the speed of fan, thus max possible is 3 speed only.
I always thought that the speed of the fan is controlled by a variable resistor.

For instance, if I want max speed :-


*------------------* (Resistor)
+ ^-

If I want speed number 10

*------------------*(Resistor)
+ __^-

If I want speed number 5

*------------------*(Resistor)
+______^-

If I want speed number 2

*------------------*(Resistor)
+___________^-
If I want speed low

*------------------*(Resistor)
+ _______________^-

So, I think it is possible to have a speed of 0 to 100 if the manufacturer wants to do it. but of course I think it would be expensive. Look at our air-cond, we can have variable temperature and I don't see why fan cannot

hhtee
11-02-2008, 09:18 AM
o ya..the other day my friend said...use the 3 blade only...5 blade lousy one...vely slow!!

i'm confused.... :confused:
if a the motor is manufactured properly, 5 blades should be ok. you see, the motor is designed to carry ONLY a certain weight (or lower) in order to be efficient. If the motor is designed for 3 blades and you put a 5 blades in, then it will not be efficient.

bslee
11-02-2008, 12:30 PM
If the motor is designed for 3 blades and you put a 5 blades in, then it will not be efficient.

I don't see how that's possible.
Its not possible to fix more blades to a fan motor that was designed for say 3 blades.
Wobbling fans are due to blade warp and its best to replace an old fan with warped blades, moreover painstaking or futile attempt balancing them again. Afterall, surely one could dish less than RM150 for a new fan and its not really difficult to DIY replace a ceiling fan. Fitting instructions are quite elaborate in the supplied manual paper that comes with a new fan. All one needs is a test pen, pliers, philips head screwdriver and of course A LADDER.

Actually, I have 2 antique styled fans with 4 blades in my home and I had to balance it by switching the blades in different locations to minimise the wobble. Took time but its done. I had to also put Loctite bolt glue to the bolts to prevent it working loose in future. KDK & Panasonic use hex bolts and one can torque them properly with a proper spanner.

firefox
11-02-2008, 02:58 PM
Why all these problems with fans, its just an easy appliance never heard of these sorts of problems before..its not a complicated gadget to use if you ask me.

bslee
11-02-2008, 03:57 PM
Why all these problems with fans, its just an easy appliance never heard of these sorts of problems before..its not a complicated gadget to use if you ask me.

Questions arise mostly when:
1. Thinking of buying it and it must perform to mostly beyond expectation...money's worth and more where possible.
2. shopping around with objective it MUST be bang for the buck.
3. Problems occur.
4. Not trusting own opinion or judgement.
5. Getting free answers...logic or not..thats secondary issue.

firefox
11-02-2008, 04:08 PM
BSlee
Fans are the cheapest appliances nowdays. Appliances dont last and give the same performance of appliance that you own. i do agree we cannot compare the appliances of yesteryears to the junk we are offered now. They are only nice to look at.

Nowdays appliances are like toys once broken you just discard them and buy another one..its all market strategy otherwise how will they survive.

bslee
11-02-2008, 04:27 PM
Firefox.. Yes its true what you say.
But I'll not recommend one particular brand of local made fan. (YES its LOCAL..not some cheap China brand) I had 2 (one was a stand fan stupidly bought by my other half despite my warning). Both broke down with the motor rattling and it eventually died. 2 years or less I think. I swore NEVER to buy anything from that local brand. Bitten 3 times. 3rd item was a hot water kettle. The boiled water stunk of its plastic.

jayded
11-02-2008, 04:59 PM
firefox,

yes la bro, it's an easy appliance. but then some of us want to know the difference ma. I believe USJ forum many people use fan :D

Thats why la i ask for opinion. U see, if the 4/5 blade fans not going to do much difference, then i can save my money and stick to my current 3 blade KDK fan.

now i also know that the motor plays a very important part. My brother's house using old NEC fan, number 3 speed is like no 1!!!

denver
11-02-2008, 06:21 PM
re: 5 blades vs. 4 blades

I have used both the Panasonic 5 blades and 4 blades fans (the ones with remote control), and to be honest, seems like they are the same to me. Maybe there are minor differences in their performance, but for an average user like me, I can't tell the difference, or rather it is not significant enough for me to notice.

jayded
11-02-2008, 10:02 PM
Thanks denver...by the way..u installed in the hall? is yours a hs/appartment/condo?

denver
12-02-2008, 09:59 AM
Thanks denver...by the way..u installed in the hall? is yours a hs/appartment/condo?

Mine is a double storey link house. I have the 5 blades in the living room and master bedroom. The 4 blades are in all other bedrooms.

jayded
12-02-2008, 03:27 PM
by the way denver,

i'm sure you have used 3 blade fans before. Is there a lot of difference comparing the 3 blade and 45 blade fans? in terms of speed, air circulation. If not much dfference, i better stay with my 3 speed fan.

thanks..

jayded
12-02-2008, 03:28 PM
4/5 blade sorry...not 45 :D

denver
12-02-2008, 06:52 PM
by the way denver,

i'm sure you have used 3 blade fans before. Is there a lot of difference comparing the 3 blade and 45 blade fans? in terms of speed, air circulation. If not much dfference, i better stay with my 3 speed fan.

thanks..

3 Blade or 3 Speed? Assuming you meant 3 blades, no, I've not used it.