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zaphod
Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale
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 Link Posted: Tue Sep 26, 2006 8:50 pm Post subject: venting a hushbox - new tools |
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so, as i tear out the ceiling, plan out wires and so on, i've been working out the venting for a hush box. damn if those NEC don't look nice, but i really want to keep the ambiant noise down.
i posted this link to a control unit and http://www.smarthome.com/3018.html a link to an inline fan http://www.smarthome.com/3011.html but Kal and others warned me that the inline might be noisy.
i decided anyway to get one at home desparate and have a listen but couldn't find one, so i turned to bathroom fans just like kal did, but instead found this new product from nutone - http://www.nutone.com/product-detail.asp?ProductID=10330 an inline fan for bathrooms. it's big (almost 10" in diameter) but should fit between the joists and also between the ceiling drywall and the floor above. i listened to it in the home despot display and for an inline it seemed very very quiet. it doesn't have a sones rating as it's designed to be remotely installed (as i will be doing).
then i started to chase down a ductstat in canada. sure i could order it for $30 in the states and ship it to my mail address there, but sometimes you have to respect the beaver.
it took a while to find one. called the manufacturer for distributers. distributors said "we don't sell them". i did find a place that sold them for $100  i don't respect the beaver that much.
then i bounced from place to place until i ended up at a controls specialist.
you want a snapdisk.
I do?
you do.
turns out that the guts of the ductstat is a small unit that sells for $10. a simple thermal switch that turns on (or off) at a particular temperature. you just buy the one which is built for your prefered trigger temp and action.
i think that the nutone fan and the snap disk are going to be the solution for pulling air out of the hush box.
i am however cashing in most of my "weird customer" chips at home desparado during this project.
_________________
walk gently. leave a good impression.
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zaphod
Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale
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| Link Posted: Wed Sep 27, 2006 11:28 pm Post subject: Re: venting a hushbox - new tools |
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| zaphod wrote: | | ...so i turned to bathroom fans just like kal did, but instead found this new product from nutone - http://www.nutone.com/product-detail.asp?ProductID=10330 an inline fan for bathrooms. it's big (almost 10" in diameter) but should fit between the joists and also between the ceiling drywall and the floor above. i listened to it in the home despot display and for an inline it seemed very very quiet. it doesn't have a sones rating as it's designed to be remotely installed (as i will be doing). |
well, i spent last night playing with the inline fan unit. not so great.
first off it is just slightly too big to pop between the beam and the floor so to use it i have two choices: 1) tear out the ceiling in the far room to install the fan from the "room side" of the ceiling drywall instead of reaching in from the HT room. 2) mount the inline fan on the near side of the beam, still in the HT room.
the second problem is that the beast really noisy. really really really noisy. i clocked it at 83 dB at the intake end. that's about 8 sones. the fan does not have a rating for sones as it is intended for "remote installation". "fine" i thought, lets put a length of ducting on the unit and measure the sound levels.
as a kid did you ever listen to one end of a hose while a friend talked into it or made "woooooo" noises? putting a duct on the intake of the fan just added echo. and dropped the sound levels down to 78dB.
still too high. so the fan is too loud and it won't fit where i need it to go. this is not looking good for the inline fan.
either the ambient sound in home dispicable was high enough to mask the sound of the fan or i have a wonky one. i'm bringing the sound meter into home depot and measuring it insitu.
i may yet end up with a traditional bathfan as did kal.
_________________
walk gently. leave a good impression.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 17860
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Link Posted: Mon Nov 13, 2006 11:43 am Post subject: |
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I end up using two 120/38 mm 80CFM 30db "computer" fans connected to 6" duct using diy adaptor. I couldn't find any duct fan that give 160 CFM airflow with only 33db. My inline is about 6 feet long, so I had to add 3 feet duct silencer to reduce duct sound...
Driving fans with only 9 V seem to be enough to cool my BD801s.
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