Vented hoods and vibration issues

change your fan position to pull through the hood and the fan with socket of hood facing the fan air coming in from tip of light passing through the socket and through the fan out the exhaus..look at my grow link how i have set up..have 8 " phresh filter and have no issues

Turning the fixture around helped with vibration. Now the air comes thru the side w/o the socket, first. I would change my fan/filter setup, but the beams in the ceiling are very few and far between. Also, The ceiling is my hardwood floor upstairs where i sleep. Ive tried hanging the fan from the cieling, but damn you want to talk about noise! I hope that I'll get a change to get the speed controller today. If that doesnt finish it, then It'll be time for some serious engenuity! Thanks again everyone.

Someguy15 said:

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.

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Fan company explained to me that incresed noise happens when fan is running under it req. current. Has something to do with load and design of impellers. Went and bought a router speed controller today. Well, it did limit air noise, and I got the bulb to quit vibrating. Alas, when lowered much, the humm of the motor increases and it seems to heat itself up. Since I'm using this motor to cool a room and my 1000w (thats 8-10" from plants), Im definately NOT going to risk motor burnout! The fan company also told me that the fans suffer NO extra wear from being turned on and off. So, Im running the fan thru the filter at ALL times my light is on, and let it run for about 15minutes every hour at night. So far the temps are solid, there is NO smell in the house (even while drying crops), and a small fan in a nearby room on low, covers the noise. Guess ima be returning a speed controller tomorrow.

As far as pulling thru the fixture, using hard piping, hanging the fan, hanging the filter, you name it ive tried it and STILL VIBRATING. I guess a 660cfm fan with a matching carbon filter thru a 6" hose is just too much damn air to expect no movement. Hell, Ive tried pulling, pushing, turning the fixture around, everything, and I still see movement. I checked the socket and the mounting fixture. Yieldmaster has a device at the end of their socket to move air around the bulb. Looks like a small piece of l-channel and must be a deflector. Regardless, Im going to put the fixture back how I had it and just let it do it's thing. I'm more concerned about odor and heat over a bulb blowing, BY FAR!! I have a back-up bulb, a backup ballast and the store that sells my bulbs for $50 is 2 blocks away. I'll just keep track of how long these bulbs last me. Hope Im worried for nothing.

Thanks for all the help guys.

Still runing 18hr cycles and bulb isnt blown yet. Vibrating a tad, and I think I see the light flicker BARELY, on occaision. Oh well, ill see if the PL ballast and cheap bulb are up to the task.

Been running the fan 24hrs a day, but now pulling thru 2 of the yieldmaster hoods and the phresh filter. I had to put a good bend in the intake hose between veg and flower room. The light was traveling thru the hose! ha! Anyhow, even with the extra restrictions and such, the bulb still vibrates, and the exhaust air noise is the same. HOWEVER!! I am still on the same bulb(s) and fan about 7months later. The fan and bulbs and ballast are all doing fine. I do believe the filter is losing some of its efficiency tho.

My big worry of fan failure and overheating is queched with a mdt-1 overtemp/timer unit. Still, I am soon to purchase a seperate fan (same damn thing, cheap and workin good so far) so I can cycle the filter on and off for odor, and cycle the other on and off with the lights. AS winter draws nearer, I'm going to have too cold temps incoming air, to run fan 12hrs during the night. Anyhow, thanks again for the advice guys, but all the worry was for nothing. It just so happens, when you pull 600cfm across a damn light bulb, It's gna vibrate a tad. Happy growing to all!