Too Big of a In-Line FAN!!!!!

[BagseedBoy]

I bought me a tjernlund 6"( ducting is 6", the fan is like 12x5- big)it puts out 530 cfm, an this is for two small boxes.. I know a was going a little big but bigger is always better, plus I can use this to vent a house in the near future..I need to lower the noise,and this fan is not a variable speed fan( one setting/ on) I'm going to enclose the fan in a box with insulation of some sort... What should I use to reduce the noise, regular insulating, carbon cuz its cubed and I can pack more, or any suggestions... The fan was 140 with shipping you can't beat it with a stick/ those Vortex Fans I hear are great but they are expensive...... SO help me out if you can... So what Kind of insulation should I put in my box to house the FAN????? Thank you in advance... I really appreciate it... If I can't get the niose down then my brother suffers and gets to hear that beast run......LMAO/ He'll benefit
I need some ones

 

[dasmo]

I'll be doing something soon as well that involves insulating a fan in my closet, so speak up, know it all's =D

 

[SuperConductor]

Do you have insulated ducting? That will cut a lot of noise out worth every penny. Then you can get a fan controller but make sure it's not a light dimmer type as they increase noise it has to be a variac type (may be called something different in your country).

If after those it's still too noisy then make a wooden or MDF box (MDF has more insulating qualities) and suspend the fan inside using hooks and bycicle tyre inner tubes to reduce vibration. You can also using insulating foam but I'm dubious it does much for mine.

It's the sound of the moving air that makes them so noisy anyway so the first two steps should sort it out. I have one and find that having it just above half way on the fan speed controller is fine for my 600W.

The other thing to do is buy or build a ducting silencer that fits on the end but again the first two steps should probably be tried first as it's expensive/a lot of work.

Also any obstruction on your ducting makes the fan noisier so if you have you carbon filter on the end of you ducting rather than the start it will be noisier.

 

[BagseedBoy]

yeah with my fan or most fans that are NOT VARIABLE SPEEDs.. when you lower the wattage you raise the amperage, and that will burn out those little motors we pay so much for... I've been asking a lot of different peps about this and a box with some sound proof sheet rock(the stuff they use in music studios SEEMS LIKE THE BEST SOLUTION, AND THE DUCTING INSULATION SOUNDS GREAT... Then I"m going to stuff err with insulation.. My fans electrical stuff is totally enclosed so not chance of starting a fire, and this one came with a mounting bracket and some weather striping but I have plenty of that.. .when building a box it should be air tight to make the ducting work properly plus no light leaks... it's a win win... but I want to KNOW IF ANYONE OUT THERE HAS ANY SUGGESTIONS ON WHAT TO FILL IT WITH/ REGULAR INSULATION, OR CARBON, OR SOMETHING BETTER... I'M SURE CARBON IS MORE EXPENSIVE THEN INSULATION....... SO ANYONE ELSE THAT HAS ANY MORE SUGGESTIONS I WOULD APPRECIATE IT.... THANKS

 

[freeradical]

yeah with my fan or most fans that are NOT VARIABLE SPEEDs.. when you lower the wattage you raise the amperage, and that will burn out those little motors we pay so much for...

I believe this is incorrect, unless you are using the wrong device to control fan speed. Common fan speed controllers hinder the net frequency of oscillations of AC current, which in turn decreases the net current, which in turn decreases net power input (wattage). These devices, however, cause the fan to buzz loudly. They are safe to use though, and will not damage your inline fan (DC fans cannot be used with these devices).

Although more expensive, a variable transformer will safely control the fan speed, without the added noise. There are many on the bay. Look for a 0-120v+ variable transformer that is rated for ~2 amps, which should be good for that fan. The fan is probably about 120W, so it pulls roughly 1 amp. Unlike other devices to control fan speed, variable transformers do not cause fans to buzz, which can be quite loud and penetrating.

 

[BagseedBoy]

Yeah it only uses 1 amp excatly.... Yeah the company told me I can get a 20% decrease without hurting it, but its true cuase I ask more then one electricain, especdially the one from that company cuz of course they want you to buy their stuff. But like I said my FAn is not a variable speed fan.... If I could find a fan Reastat, I could drop it by 20%. THe more you lower the wattage the higher the amperage will be, I'm no electrician but I asked about three from three different locations an they all agreed with me and told it would burn the motor up cuz I'm not risking runing more amperage then what the fan recommend... Have you herd of TJERNLUND fan.. check the site out the guy tried to tell me I could get one for the fan but then I went to the site an it didn't show err.....

 

[BagseedBoy]

What you said does make sense but I hear you lower the wattage the amps go up....... IDK, but three Electrcians agreed.. I could be wrong but I'm just making a encloser around, plus I like the power she puts out.. more air the better.. THe lower temps(around 75 are better anyway) I like to keep my room at 70-75, at least when I ran my 600wt Hps in my small ass bathroom.. I only had a 2x3 space but it worked beautifully, some sayu over kill, but I say if the temps stay down its only going to help, well if you got a good air exchange of course...... FRESHER AIR IS ALWAYS BETTER THEN STALE

 

[wastekan]

watts = Volts x Amps.. to lower the wattage either the amps and or the voltage must decrease not increase