Would man current inline fan be enough if I upgraded my light...

Okay so right now current setup is a 150w sunsystem w/ built in ballast I have a 4 inch inline fan 179cfm takin air out. I do have carbon scrubber but not hooked up right now in a 2x3x5 grow tent with a small fan outside blowin air in the tent and a fan inside the tent blowing on the canopy. My question is if I upgraded to a 400w air cooled reflector with 6 inch fittings and digital lumatek ballast would man inline fan be strong enough for a 400w? Also where would be a best non fire hazard way to put a ballast outside the tent ? Also do they make convert or fittings so I don't have to get a 6 inch fan unless the 4 inch isn't strong enough?

4 inch might be if your temps are low enough. The less fan power means the light will run hotter. I hang my ballast up on the wall with a piece of plywood. I would just get a 6 inch fan and filter and use it cause the 4 inch may be 179 com, but with the filter and ducting you lose Cfm

1 more vote get a new fan. U will need more power

Sent from my SCH-I545

i regretted getting a 6" because my 4" pushes out plenty, but it's a 200 CFM
also i ran the duct to do minimal bends, each 90 creates air loss (less cfm's)
i did the exhaust at the very top, and a passive intake on bottom with a filter box and a diffuser to make sure air was spread through the whole room

if temps were a problem with the 150, especially if it gradually climbs until lights off, means heat buildup.

if this is an issue you need to make sure the room that the grow tent is in either gets mixed with outside air or enough house air to keep the temperatures down. At this point it may mean putting a fan in your window or doorway , or turning on a cieling fan in the main part of the house with your door open , there are plenty of options

to be safe you could go with a 6" though, just saying it may be possible with a 4" especially if you take into account the engineering aspect

Alright so for sure a new fan, and ducting. I don't have much angles or ducting to run maybe 2-3 feet total so I don't think I'm losing too much cfm with my current fan.

Get a 6" 440cfm inline centrifugal exhaust fan.A 400w H.I.D. is going to be considerably hotter than a winky dinky 150w H.I.D. is.

I have a 400w HPS in a 3x3x6 grow tent and use a 4" 179cfm inline centrifugal exhaust fan that exhaust into the attic and out the attic vent.In summer I have to either shut down or use air conditioning to keep the temp in the room the tent sits in at 65°F so my lights on temp in the tent is 75°F to 78°F.

I like to use this graph when designing new grows...



Keep in mind that is the airflow required to keep things at a certain temp diff lights on.If you use a carbon filter it cuts down on cfm by 25% to 50% so make sure your fan/filter combo moves that much air.

When making bends in your ducting keep them at 45° or less as a each 90° bend can cause a 25% or more airflow loss.

Okay guys so I did the cfm equation length x width x height divided by 3 which is how many times the air will circulate in the room right now it's 30 sq ft and 10 cfm to circulate 3 times every minute. So if I put my 400w in there I'm thinking it should work and not be so hot if I have roughly 150 cfm's still to pull the air thru the hood and temps stay low?? Can I get some opinions in this and I'll add a picture when I get home this evening

Thanks for the reply. I love that graph and I think I may be able to get another fan to take that heat out. It's just finding one for a good price that will last and work with a fan controller. I'm thinkin if I can run 225 and up cfm it should take care of the temps even during summer. The fan I'm lookin at is 710cfm or 440 like you said.

While an 8" 710cfm is way overkill you could always run it on a speed controler and it would run quieter than the 6" 440cfm inline.It would also be usefull should you decide to go bigger.

But a 6" 440cfm inline centrifugal (no speed controller) hooked up to a Can 33 filter should have an airflow rating of about 309cfm (that's with no ducting)...so it should be plenty and keep your t-diff about 4°F-6°F above ambient (temp of room your grow pulls it's fresh air from) during lights on.

That's what I'm thinking would be best prob a 6 inch for 445 cfm...brand is oracle? Found it on igrowhydro.com for 81 bucks. Also says it runs quieter than vortex fans (I've never had a vortex)

For $81 bucks I doubt it runs quiter than a vortex,and doesn't come with a kickass warranty.

I've learned throughout life that you get what you pay for...ie;Buy crap product,get crap performance and warranty.

I think it would be dependent on the ambient temps of the room. You're better off getting a 6 inch inline fan with a speed controller and adjust it as need be..and yes they have conversion things allowing you to go from 6 inch to 4 inch and vice versa.