Vented hoods and vibration issues

I have a yeildmaster hood and I'm running a 1000w Hps light w/a remote out of room ballast. Ive purchased a phresh 6" can filter to fit on my 6" tjernlund 660cfm fan. My question is this:

i want to run from the filter, pull thru the fan, push thru the hood and out the wall. Even with hoses and such, the vibration from the sheer ammount of air is making my bulb rattle a tad.

So, do I just exhaust the light into the room (8'x10x8') with the two cpu fans Ive been using, and hope the filter grabs that air before it heats the room or

Exhaust the room thru the hood and not worry about the vibration.

Im using a passive intake from my basement (cooler air), and when it gets warm, I'll be ducting the hvac in. I assume the exhaust will run 24/7 so the smell is NOT an issue.

Anyone have a simple setup thats been proven? Perhaps one that DOESNT include venting room and fan seperately? Thanks for the suggestions.

I am not sure if i understand correctly but if so, you should buy a metal bracket and solidify your mogul socket in the hood. Cpu fan are not enough, 200cfm is not even enough for a 1000w (wich is what i have and having heat issue), your 600cfm would be a very nice cooling fan for a 1000w.

Post pic

I have been running 2 cpu fans for about 2 grows now. Believe it or not, I havent really seen any heat issues UNDER the lamp, to as close as about 8-10" from the plants. The inside of my yieldmaster isnt but a cubic foot at best, so im thinking the little fans running about 120cfm total are plenty. Combined with recirc fans, working good.

My mogul socket it made into the yieldmaster hood. It isnt that the socket is moving a lot, its just the speed of the wind going around the bulb. I'd hate to think that yieldmasters bracket needs reinforcing? Anyone else have this issue, or am i being paranoid? perhaps a litttle rattle aint gna do shit? Thanks for the reply xan2

nice looking bully!

i think you should turn your speed down. get a router control from harbor freight, or a dimmer switch. i have the same fan, filter running through 2 600watters. i turn the fan down to 40%. when the temps. start to go up outside i will increase the fan speed a little more.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=43060 -thats the speed control from harbor freight.

I was told that to lower the fan speed to less than about 10% would burn the motor up.. I even called tjernlund about it, and he said best i could do was get it down to 400 or so. Were they full of shit? Im wondering, how much slower is the Phresh 24" filter gna make my exhaust? If I could turn the fan down that much, that would be so awesome! however, dont want to burn up $100 worth of equip. You got any pics of your exhaust setup Captain?

Shanus said:

You got any pics of your exhaust setup Captain?

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heres one without the filter(early veg., no need for odor control)

i got the router controller and i believe my fan to be running @ 40%. its been running that speed for 19 months 24 hours a day. no problems. if you ever run without a filter, it a good idea to put a panty hose over it to act as a prefilter. keeps the fan insides clean.

Got the system how I prefer it, yet.....bulb still vibrates. Oh well, think ima run it and see how long it lasts? Bulbs arent but $50 and I got a back-up. Dont know if this takes care of the smell, but hope so, since harvest season just began. I'll know in the mornin if the $200 filter and $100 fan are setup and working properly. Still considering the fan controller.

Shanus said:

Got the system how I prefer it, yet.....bulb still vibrates. Oh well, think ima run it and see how long it lasts? Bulbs arent but $50 and I got a back-up. Dont know if this takes care of the smell, but hope so, since harvest season just began. I'll know in the mornin if the $200 filter and $100 fan are setup and working properly. Still considering the fan controller.

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looks to be set up proper. have you checked the socket mounts thoroughly? its gotta be loose. $50 is a lot to blow if you gotta do it every couple months. bulbs should last a year minimum.

Good news. NO SMELL!!! Even with budz drying in the corner, no smell. The temps in my room are about 2 degrees cooler than main rooms. Awesome, 76deg max, 68deg min.

As for the fixture. It seems to be mounted tighly. Im just thinking that the hose is being vibrated as the air makes the bend. That and the fans are blowing it around from the outside too. The socket seems to be mounted really well, so I'm going to have to just let it go. Aside from mounting the filter to the light and using non-flex pipe, I dont see much choice. I dont really want to readjust that damn fan each time i lift the lights. soo.....

Im happy with the results so far. Ill post when/if it seems that bulbs burns out too soon. Thanks

You should put a small piece of straight pipe on top of your filter then a 90 degree elbow on that then run your flex.flex will cause alot more noise and vibration than hard pipe, so try to keep it as straight as possible and when you do make a turn make them slow and smooth. Or you can just hang your filter horizontal with your light and shorten up your flex pipe.i do heating and cooling part time and was told that 25 feet of flex will reduce flow by almost 1/4. I removed 10 feet of flex and used hard pipe and noticed cooler temps and a much more quiet fan.

you should investigate dampers, they make noise dampening tubes for the air flow. Here are some ideas, pretty sure they make special ducting as well.

http://www.ehow.com/way_5547834_air-duct-noise-reduction.html

http://www.acousticalsurfaces.com/hvac/duct_silen.htm?d=26

I will see if I can find a better link when not stoned off my ass

sixstring2112 said:

You should put a small piece of straight pipe on top of your filter then a 90 degree elbow on that then run your flex.flex will cause alot more noise and vibration than hard pipe, so try to keep it as straight as possible and when you do make a turn make them slow and smooth. ...

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Great advice, im going to buy a 90deg and a piece of straight to come off the motor. I'lll run a short piece of flex between the light and the hard pipe. Im sure I'll come up with some duct taped slip joint for the pipe too.


As for the router. Going to get one this week. I think I'm good running what I do for now, since summer's coming. But...adjustable even better. Thanks guys.

Oh btw. Ive noticed the vibration is causing the bulb to flicker now and then. I did some research, and vibration is a big no no for bulb and ballast. So, time to go spend a tad more cash.

i think if it's vibrating like that you might of got a bad hood or socket, if its new take it back and bitch.

Shanus said:

Great advice, im going to buy a 90deg and a piece of straight to come off the motor. I'lll run a short piece of flex between the light and the hard pipe. Im sure I'll come up with some duct taped slip joint for the pipe too.


As for the router. Going to get one this week. I think I'm good running what I do for now, since summer's coming. But...adjustable even better. Thanks guys.

Oh btw. Ive noticed the vibration is causing the bulb to flicker now and then. I did some research, and vibration is a big no no for bulb and ballast. So, time to go spend a tad more cash.

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i really wish i could look at the system. i'd tell you whats wrong in a sec. what a bummer. i went back and looked at the foto of your setup. super clean! I'm loving that hood!!! for that reason i can't see how your shit is fuckin up? obviously the fan generates the vibrations. you need to figure a way to isolate it. secure it to something rigid like the foundation(drill holes) or some framing. possibly even the floor joist above your head. i place a sheet of rubber between fan mounts and framing.

My YieldMaster & Can Max 675 cfm makes my bulbs vibrates a touch. It seems to happen when your pulling high cfm (like 4-500+) through them. Also having the wind come from behind the bulb is ideal if your hood has wind breakers. MH bulbs are worse due to bulb shape, HPS much more streamline. So far it's been like this 2-3 months I see no problems yet. As long as it's not real loose you should be fine.

Oh and those router controllers kinda suck IMO. My fan is quieter on full blast properly insulated then it was with the controller. Makes the motors hum and the slower you go the louder the hum. It can also have negative effects on cooling the motor and cause outages if you dial it too low. Just my 2c.

I had the same problem where the bulb was vibrating, I turned my reflecter around so the air flow hit the back of the bulb first, it worked for my set up.

LOL you replied as I was typing.

save your money on that router, all it will end up doing is making your fan hum.
Or make sure to save your receipt so you can return it..
I bought a speedster controller and it makes my sunleaves fan hum louder than the air it is moving.
Everything I read keeps coming back to a variac to reduce fan speed without a hum.

Someguy15 said:

Oh and those router controllers kinda suck IMO. My fan is quieter on full blast properly insulated then it was with the controller. Makes the motors hum and the slower you go the louder the hum. It can also have negative effects on cooling the motor and cause outages if you dial it too low. Just my 2c.

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cymbaline said:

save your money on that router, all it will end up doing is making your fan hum.
Or make sure to save your receipt so you can return it..
I bought a speedster controller and it makes my sunleaves fan hum louder than the air it is moving.
Everything I read keeps coming back to a variac to reduce fan speed without a hum.

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i think you are both very wrong. i placed a DB meter in my room varying the speed control. guess what happened? when i turned the speed up, it got louder. turned it down, it got quieter. it just makes sense that the sound would increase with speed since the volume and speed of air increases. its just simple physics, guys. hate to shit on your advice parade, but you are handing out bogus info. he really has a vibration issue,and not a sound issue anyway. i think the advice of turning the fixture 180 degrees was great advice.

captain chronizzle said:

i think you are both very wrong. i placed a DB meter in my room varying the speed control. guess what happened? when i turned the speed up, it got louder. turned it down, it got quieter. it just makes sense that the sound would increase with speed since the volume and speed of air increases. its just simple physics, guys. hate to shit on your advice parade, but you are handing out bogus info. he really has a vibration issue,and not a sound issue anyway. i think the advice of turning the fixture 180 degrees was great advice.

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Good thing i never made it to the store. Im going to try the obvious : turn it around first. Only makes sense" tie the venting into the other side of the fixture". I'll try that first thing in the A.M.

Thanks for all the advice guys. I knew that LEMON SKUNK was contributing to clouding the obvious!