In line booster fans

Can in line booster fans be used to ventilate a grow room or to ventilate 600 watt hps hood?

I use a 420cfm booster fan for my hood. I would not use it to exhaust. Just the small duct run I have for my hood cuts the air flow a lot. They are not really meant to move "still" air, they are meant to aid in moving air that is already in motion so to speak.
If you are going to buy one for your hood, make sure you look at the free air cfm and not the boosted cfm. The free air cfm is how much the fan will blow sitting on a table. The boosted cfm is how much air can be moved through the duct before the fan becomes a restriction.
My 420cfm booster fan is 8" and keeps my hood cool enough that the plants can touch the glass with out burning. I use 600watts, so the light burns them when they are that close, but not the heat. I got my fan on ebay for like $40 and its worked just fine for me. I just had to wire it up to an extension cord.

tried a 6 inch inline fan to cool my sunleaves artic hood, didnt work well. wasnt keeping the light cool enough and was making my room climb to 88 degrees. I bought a fan similiar to the husky home depot fan and made it blow air through the ducting to the hood to keep it cool. The inline can fan i think is good only if you are using ducting from central air to run into the room, or using it from another room to help small amounts of fresh air to come into your room.

I bet the reason your fan didn't keep it cool was because it was rated at a super high boosted cfm rating, which most in the hydro stores and websites are, but had a low free air rating. That is one thing you really need to look into if you are going to buy these types of fans. Contact the manufacturer and ask them what the free air cfm is.

agreed. I just believe if you are going to try and cool a hood and want to vent the air out of the room, you should get a blower fan, not an inline fan. personal opinion...

I agree with you there, I was saying to use the duct fan just for you hood, and another blower for exhaust. I use my 420cfm duct booster fan for my hood and a 465cfm blower for my exhaust. It keeps my cab about 5 degrees above ambient temps with my 600watt HPS.

When you say "inline booster fan" it makes me think that you are refering to the ducting fans sold at Lowes/Home Despot. I would not recommend using those in a grow. They are not very powerful at all. As soon as you start hooking up ducting to them they become almost completely useless. Thats why they call them "booster fans" and not "fans". Spend the hundred bucks and get a real one from the hydro shop, it is money well spent.

The fans are similar to the fans at home depot, but a lot more cfm. The ones at home depot are rated at their boosted cfm, which means they are not very powerful. But if you buy a fan online and get one with a good amount of free air cfm, you will be fine.
If you read my post above, it explains the difference between the two the cfm ratings. You can get a good fan for $40 if you are only cooling your hood with it. Especially if you get one with a high free air cfm.
If you get a cheap fan with a higher cfm rating than is needed, such as I did with the 420cfm, even with the duct on it, there is plenty of air to cool my hood. As I said before, with my duct fan, my plants can touch the glass on my hood without burning.
I agree they are not powerful enough for an exhuast fan. But for cooling a hood, as long as the free air cfm is high enough, you will not have a problem.

i bought 2 6" inline fans off the net, $44.95 a piece. going to use them to cool my cool tube...as soon as i figure out how to connect them.

I use a 6inch and a 8inch bootster fans to cool a 1000watt and exhaust the air into a carbon scrubber

I would not suggest running them through a carbon filter. They do not have enough force to properly exhaust your air.
To hook you fans up, just duct tape them to your cool tube, and hang from the ceiling. Its that easy.