arcane Posted August 16, 2009 Share Posted August 16, 2009 (edited) I also use the CF as an extraction point instead of a intake, but being quite prang I also have acoustic ducting and a silencer, and considering it's a 150mm L1 (which sounds like a fucking jet taking off without silencers and acoustic ducting), it's fairly low key. The other thing I tried was putting the other silencer I bought on the intake end of my fan, so there was a silencer both sides of the fan and it didn't make a vast differnece, but it was noticeably quieter; I can't however keep both silencers on atm, as my space doesn't allow for both. The grease filter is black after only a week or so so is catching loads of shit that would otherwise gum up your fan blades and possibly the CF, maybe reducing both of their lives. Increases fan noise having shit on the blades. Think I might invest in some grease filters. Edit: Typo. Edited August 16, 2009 by arcane Link to comment Share on other sites More sharing options...
groovelick Posted August 16, 2009 Share Posted August 16, 2009 been thinking of the noise induced at the input of the extraction run would it be worth while making something to go on the input that is like a cowling that gives a gentle curve so the air flow is'nt coming in through a staight cut end like a ram pipe in car carbuation in pictures it easier to see what I mean just been in garage to dig this book out admitedly its for cars... but the premis is the same the contraction point is the area where the air causes turbulance and hence the noise so we need to eliminate the turbulance so if we flare the open end obviosuly the ones that increase the air flow positivly, also reduce the induction sound so less turbulant airflow throughout I've not tried this yet but noise isnt an issue for me Link to comment Share on other sites More sharing options...
BluePixie Posted August 18, 2009 Share Posted August 18, 2009 The grease filter is black after only a week or so so is catching loads of shit that would otherwise gum up your fan blades and possibly the CF, maybe reducing both of their lives. Increases fan noise having shit on the blades. Think I might invest in some grease filters. Just shows the crap they catch if running extract in 'reverse'- about 11 weeks worth in this picture..... Link to comment Share on other sites More sharing options...
Culchi Posted August 18, 2009 Share Posted August 18, 2009 Some of the noise is down to vibrations, try hanging your fan using rubber bungees or similar, or you could try insulating it as well with a blanket or something like that. Link to comment Share on other sites More sharing options...
Amnesia Posted August 18, 2009 Share Posted August 18, 2009 Some of the noise is down to vibrations, try hanging your fan using rubber bungees or similar, or you could try insulating it as well with a blanket or something like that. No noise here! I washed the pre-filter today after seeing it was a dirty white colour,after drying it and putting it back on that suction noise i was talking about has been dramatically reduced!,I can now only hear it if i listen with my ear to the door. So don't forget to keep those pre-filters clean!.And yes my intake is filtered through a pair of mrs Amnesia's tights Link to comment Share on other sites More sharing options...
Guest grandad Posted August 18, 2009 Share Posted August 18, 2009 it depends on the size and power of fans, i used to use a 4" kitchen fan with a good result, very little noise, i now have and 8" 3 speed fan and the noise outside is the blast of air coming out, very loud on high speed fair quite on low, depends on the temps. Link to comment Share on other sites More sharing options...
Greenattic Posted August 18, 2009 Share Posted August 18, 2009 Some of the noise is down to vibrations, try hanging your fan using rubber bungees or similar, or you could try insulating it as well with a blanket or something like that. No noise here! I washed the pre-filter today after seeing it was a dirty white colour,after drying it and putting it back on that suction noise i was talking about has been dramatically reduced!,I can now only hear it if i listen with my ear to the door. So don't forget to keep those pre-filters clean!.And yes my intake is filtered through a pair of mrs Amnesia's tights :wink: Hi Amnesia what is that insulation you have on your fan, i have the same fan as you. Link to comment Share on other sites More sharing options...
StealthShed Posted August 19, 2009 Share Posted August 19, 2009 (edited) I have the cf in the grow room too but i put a 't' piece on the end and now have 2 cf's in there side by side, each now only draws 1/2 as much air as it did so should last twice as long and is much quieter than just 1 (the inlet and exhaust fans are suspended in a different loft in big boxes of bubble wrap), shouldn't cost any more in the long run so long as they do last longer due to the decreased air flow. Doing this also reduces the cf's resistance to air flow through it as well, works well so far. Edited August 19, 2009 by StealthShed Link to comment Share on other sites More sharing options...
Amnesia Posted August 19, 2009 Share Posted August 19, 2009 Hi Amnesia what is that insulation you have on your fan, i have the same fan as you. I explain how i did it in this post here.Ruck temperature controlled fan Link to comment Share on other sites More sharing options...
Greenattic Posted August 19, 2009 Share Posted August 19, 2009 Hi Amnesia what is that insulation you have on your fan, i have the same fan as you. I explain how i did it in this post here.Ruck temperature controlled fan Thanks for the link Amnesia its all good stuff . Link to comment Share on other sites More sharing options...
FARMER G Posted August 19, 2009 Share Posted August 19, 2009 wrap ya fan in bubble wrap seen some one do it on here , might help ya noise prob Farmer Link to comment Share on other sites More sharing options...
Guest daviie Posted August 19, 2009 Share Posted August 19, 2009 I find the majortiy of the noise comes from the air sucking through the carbon filter. Same here,nowt can do about that though! build your own diy style, acustic ducting, well easy Build what exactly? ,i've already got acoustic ducting and the fan is in a box with acoustic foam.The only noise i get is the air being sucked in through the carbon filter and i don't think much can be done about that. Any solutions though and i'm all ears! You will reduce CF noise a lot if you use an oversize filter, that is a CF with a greater volume flow rating. That holds, assuming you're using the same fan. Link to comment Share on other sites More sharing options...
Amnesia Posted August 19, 2009 Share Posted August 19, 2009 You will reduce CF noise a lot if you use an oversize filter, that is a CF with a greater volume flow rating. That holds, assuming you're using the same fan. Valid point daviie i will probably get a bigger one when i need a new one,since i've washed my pre-filter the noise has been cut by half and you can only hear anything now if you put your ear to the door. Good tip> keep your pre-filter clean! Link to comment Share on other sites More sharing options...
arcane Posted August 24, 2009 Share Posted August 24, 2009 Just shows the crap they catch if running extract in 'reverse'- about 11 weeks worth in this picture..... No shit. Need to do some 'shopping' tomorrow, so that goes on the list! Link to comment Share on other sites More sharing options...
gaz_0001 Posted September 3, 2009 Share Posted September 3, 2009 Your fans boxed so thats silent. If the CF is making noise box and insulate around the box but not actually around the cf itself, just around the inside or outside of the box its it, then acoustic ducting from the insulated box. Should isolate the noise of air being sucked into the CF. Also if you have a 5" CF then you could use 6" ducting on the input, be even queiter still Link to comment Share on other sites More sharing options...
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