Best Answer Forest , 08 December 2016 - 12:51 PM
it all points to a blocked filter they can block with dust, if every other thing is ok theres not much else it can be try taking the filter off as mentioned at least you can rule that out
Go to the full post
Smeghead
Posted 08 December 2016 - 08:56 AM
So yeah as per the title iv been having peaks of 34 with a 250w hps in a mainly uninsulated loft ,in december...da fuuuuuck.
my tent is in a 75mm kingspan box and i had it pretty much dialed in after about week 4 of my last grow maintaining a 25-27 temp range thru august so im a bit baffled why when its freezing outside i cant seem to keep my temps down.im using the same ventilation as before with a 100mm rvk exhaust with passive intake but at the min im having to have tent door 2/3 open to keep it near abot 28/29 .im proper blagged ,any one got any ideas?
Cheers BC
earth bound misfit
Posted 08 December 2016 - 09:39 AM
BioBomber
Posted 08 December 2016 - 10:09 AM
When is the last time the dust cover was washed on the filter?
A few grows back i had temp issues and noticed there was not much negative pressure. I took the dust cover off and it was like shaking out a hoover filter! Worked perfect after. Worth a check.
I also find if the RH is too high like 75% + if affects the performance
Edited by Chew, 08 December 2016 - 10:10 AM.
Smeghead
Posted 08 December 2016 - 10:21 AM
When is the last time the dust cover was washed on the filter?
A few grows back i had temp issues and noticed there was not much negative pressure. I took the dust cover off and it was like shaking out a hoover filter! Worked perfect after. Worth a check.
I also find if the RH is too high like 75% + if affects the performance
first thing i did when i noticed the spike was take cover off and wash it,rh has been high but for last 4-5 days iv switched to a flowering friendly 25% with fuck all improvment in droppin temps.my loft hatch has never fitted right an i noticed there was warm air from house cuming into loft so i made a new draught sealed hatch,still no effect.im perplexed lads.
im gettin a bigger fan and new filter after this grow but i need to understand why im havin such odd temps its winding me right up 
Edited by Bubonik Chronic, 08 December 2016 - 10:22 AM.
BioBomber
Posted 08 December 2016 - 10:30 AM
first thing i did when i noticed the spike was take cover off and wash it,rh has been high but for last 4-5 days iv switched to a flowering friendly 25% with fuck all improvment in droppin temps.my loft hatch has never fitted right an i noticed there was warm air from house cuming into loft so i made a new draught sealed hatch,still no effect.im perplexed lads.
im gettin a bigger fan and new filter after this grow but i need to understand why im havin such odd temps its winding me right up
Have you checked all the duct for leaks?
If it's always worked and now not i would think its fan/filter related?
Smeghead
Posted 08 December 2016 - 10:45 AM
yeah mate when i washed the prefilter i checked all connections and for any leaks and its all sound,though i noticed the drop in suction when my cf is in place to when i removed it is huge from like a wind blowing in your face to hardley owt coming out when the cf is back in place and iv got a short run with minimal bending.and like ya say if its been working fine uptill now its unlikely to be fan/filter.
Edited by Bubonik Chronic, 08 December 2016 - 10:48 AM.
BioBomber
Posted 08 December 2016 - 10:56 AM
Is the fan connected directly to the filter?
Smeghead
Posted 08 December 2016 - 10:57 AM
no, cf is in the tent (a 60x60x140) and the fan is on top
BioBomber
Posted 08 December 2016 - 11:10 AM
no, cf is in the tent (a 60x60x140) and the fan is on top
Try connecting straight to the filter if you can? Do you have another filter you can try?
I only ever use Rhino pro. They do their job in regards to cleaning the air but I find them a bit....temperamental. I had one fail totally due to high RH. I know everyone is gonna say they are the bollox etc etc, but i've had 2 let me down over 18 months. The first sign has always been lack of negative pressure along with high temps.
If it was working fine, and NOTHING has changed, i can only think filter seeing as the fan works correctly when not connected.
Smeghead
Posted 08 December 2016 - 11:18 AM
iv got neg pressure,tent sides are sucked in a bit and if ya light a flame next to intlet vent it bends.and theres no smell from exhaust.only other thing i can think of is having heating on in house full whack most of the time but loft temps go from bout 3-15.
Edited by Bubonik Chronic, 08 December 2016 - 11:18 AM.
