Quote Originally Posted by jamstigator
MegaOctane12, what I 'saw done' to keep the fan noise down is to use a rheostat to dial down the fan speed. You can, like, tune it that way to produce less noise. With the cab airtight and closed, a 6" fan dialed down isn't really that bad. A 6" centrifugal fan spinning slower than its max can move the same amount of air as a 4" fan, or more, but do so with less noise. Photoperiod here is night, no probs. And it has to be because, yeah, the heat would be an issue with these 100+ degree F days if the lights were on during the day.

Obviously, there's no real heat probs with the cab I posted an image of, as you can see not just an HPS light (400w) but also eight extra 30-watt warm CFL bulbs going. I think a 600w light would work okay, but that'd be less flexible in terms of light placement than a 400w and some moveable CFLs. A 600w light would be more efficient on the electric bill, I'm sure, but you can't have everything.

What seems like it could be a problem is fitting a carbon filter into a 3' wide cab. I've seen some short, stocky barrel-shaped ones, so I guess it's possible, but those are large in diameter (to make up for the loss in length while still providing enough surface area), so that'll chew up a lot of volume. That's the only thing I'd be concerned about from that diagram.

Yeah sorry man I totally forgot to mention the fan speed controller, I have one. I made the mistake of buying only a 175m3/hour fan, the smallest they do in the RVK, although this works perfectly for the space, I learned afterwards that its better too buy a more powerful fan and 'dial it down' like you said, so that you get the same exhaust power as you would the 175m3 fan but much less noise. I would probaly sell this if the opportunity came up and get a better one. Someone suggested that I use the box the fan came in and pad it with bubble wrap or use that styrofoam type material but too be honest I couldn't be assed with it. I just settled for never using the fan at night.