Centrifugal Fan

[Pleb Scrubber]

sup growers,

Im considering spending $170 on a centrifugal fan (150mm canfan), and wanted to get some advice before hand.

Should I get a can fan brand? (more expensive?)

 

My grow tents temperature sits around 31 - 33 degrees at day, and down to 23 degrees at night. Is this too hot for my plants?

The outside temperature is 5 to 10 degrees cooler. There are hotter days ahead.

 

 

Some details of my growroom...

I have 2x 150mm inline fans, one for intake one for output plus 1x household oscillating fan in the tent.

All fans run 24/7.

The intake comes from a window, thru a mesh screen, then 6m of duct, then the inline fan.

The output goes thru an inline fan, then 6m of duct then a carbon filter.

The tent is 1.4m x 1.4m x 2m. Tent has 3x 150mm airduct ports. Its in a basement type area and around it on 2 sides are concrete walls, the other sides are timber/gyprock walls packed with insulation batts.

No clearence above tent to ceiling.

I run a flood/drain table so the plants are up off the ground by 500mm.

 

Is there a cheaper option to get the temp down?

Can I change the placement of the existing fans to increase air flow?

Should I remove the CF until I hit flowering and really need it?

 

 

Thanks in advance

[smokinjoe]

Removing the CF will certainly improve flow and thus temperatures if your strain produces little or no odour during veg.

 

If you can afford the $170 I'd certainly shell out for the bigger fan as you are going to need it come flowering time to pull more airflow through the CF.

 

Try pulling the air through the CF rather than pushing through it, as you might find this drops the temps a fair bit due improved flow. You might like to do this before shelling out for a more powerful fan.

 

Can you let us know the brand of fan you are planning on buying?

[everest]

get rid of filter and buy big sucker fan go 300 mm if you have to , vent out into open air pref , upwards , as hot air rises i think . doh

 

aye use the 2 x 150's as intake

 

ev

[Pleb Scrubber]

Thanks for the feedback.

 

What brand? I thought can fan was the brand? (newbie)

The type of fan im looking at is...

 

CAN FAN RS 150 INLINE DUCT FAN 65WATT CENTRIFUGAL

http://cgi.ebay.com.au/CAN-FAN-RS-150-INLINE-DUCT-FAN-65WATT-CENTRIFUGAL-/400174147042?pt=AU_Seed_Starting_Hydroponics&hash=item5d2c3ce5e2

 

The strain is White Widow.

The heat is comming from the HID light, 400W MH. Temps wont drop below 31 until lights out.

Light is about 2 feet from plants/thermometer.

300mm centri is out of my budget, and im not sure if you can connect that to 150mm air ports?

 

I disconnected the CF, temps dropped maybe 1 degree...

 

When you say 'try pulling the air thru the CF' the CF seems to only have an outlet on one side, I can only push air into it.

 

The CF is just outside the grow area, under the house. Venting outside is not really an option as I have close neighbours on both sides with 2 story houses. I am trying to use the basement area as a secondary air buffer after the CF. My mate has the same CF and has 6 WW in bud, and you can still smell it a bit after the CF.

Edited December 8, 2010 by Pleb Scrubber

[smokinjoe]

31 degrees is not too bad btw, not ideal but ambient temps in my parts are that most of summer. They will naturally drink shit loads of water in higher temps, provided that is available you generally don't have many problems. Add high humidity to the mix though and you'll battle mould.

 

If you don't really want to buy another fan, just run with it as is and turn the lights off for 4-6hours between 11am and 5pm, which should knock out the hottest part of the day, and then flower through the night.

[The Hash Nibbler]

Try a 150mm plastic westflex centrifugal fan, mount on top of tent then run the 150mm duct up to where you want to exhaust the air and mount carbon filter there, use a 250mm x 500mm Carbon filter but use adapter rings to size down to duct size. This means less velocity of air as it upsizes into the filter, meaning it's a lil quieter. I take it you have a tent, it's the 150mm size restriction I have too.

 

 

"When you say 'try pulling the air thru the CF' the CF seems to only have an outlet on one side, I can only push air into it."

 

.I think he meant You can mount the carbon filter in the grow area and turn your fan around so it pulls through it. Only need one hole for that.

Goodluck, Good ventilation with good Centrifugal fans is essential especially if running in summer, need that good fresh air for co2 the plants will want when temps rise. Gh72

[Pleb Scrubber]

Thanks for your help guys...

 

My CF takes a 150mm duct x 500mm long, i dont want to buy another. I could move the CF inside the tent tho and suck thru it. Space is limited tho.

 

I have no clearence above my tent, the 150mm ducting is squashed down and you can see its shape thru the ceiling of the tent.

 

Good idea about using the middle of the day as the dark period, but the heat isnt really comming from outside, its comming from the grow light... even at night the temp is 31.

 

I checked out the westaflex plastic centri but its even more expensive? Mr hopper?

Edited December 8, 2010 by Pleb Scrubber

[Frazz]

westaflex is a quality fan

forget cost, how much you spend scoring? .. see how much you gunna save yourself by growing ya own

i just looked @ my fan ' date of manufacture: 2003 , 7 yrs of service divided by cost $240- = $35 per year

thats chicken feed partner

 

 

[Pleb Scrubber]

westaflex is a quality fan

forget cost, how much you spend scoring? .. see how much you gunna save yourself by growing ya own

i just looked @ my fan ' date of manufacture: 2003 , 7 yrs of service divided by cost $240- = $35 per year

thats chicken feed partner

 

 

 

wait, you say I should get a westaflex over the canfan? pay more for the poxy looking plastic instead of less for the hardcore metal one? similar flowrates and wattage Aw i dunno... and i just blew 200 bucks on seeds and neuts... but i sure am stressen over my poor girls roasting...

[Frazz]

hey no, dont stress Pleb .. 30 degrees is ok

the can fan is ok either one , it dont really matter

im just stoned too , so dun take me too seriously as im bit of a joker, mid-nite toker and i tend to babble on

so Pleb man just go with the flow .. everything is realative , this is a good learning curve for ya

next time you gunna have it all dialled in and you will knock 'em dead

just keep on doing what ya doing and you come out with a smile on your dial ok