0x43d
Member
Hi there, to begin I'm not sure if this is the correct forum to post if not could moderators please move the thread to the correct one please.
My set up is as followed.
The tent volume is 13.25m³.
In a smaller tent, running the same exact setup I was yielding consistently high and without issue, but when going to this tent in particular the issue arose as the volume was larger and I'm trying to dial in the fan and air situation.
Tent maintains 26c (78f) and 70% humidity, water, nutrients etc are all the same for all plants.
Originally I had an 8" exhaust and an 8" intake and I was getting positive air pressure, and that only became worse with the carbon filter attached so I swapped to the two 6" fans to obtain negative air pressure however the past two grows have rendered the same issue.
The fans are at opposing sides of the tent, the intake is at the floor level and the exhaust is at the roof.
Moving into week 5 some of the plants appear to be underdeveloped and this continues to show throughout the grow however the past two grows 2-3 plants were fine and growing normally and 2-3 were not, showing small colas and pistils that weren't sticking out, they were curled in and an off-white colour compared to the healthier plants which had bright white pistils that were poking out all over.
The plants that were fine were in direct path of the intake fan to the exhaust fan, the ones that weren't doing so well were on the perimeter of the tent out of the direct path of the fans and considering they're all in the same environment, receiving the same food, water, light etc I can use process of elimination to lead me to believe the air is the perpetrator.
Since changing to the 2x 6" intakes recently there has been a slight change in the plants that were underdeveloped and they seem to be catching up however I'd like to be certain this repeating issue is over so I'm planning on getting a fan speed controller and dialling back the intake to be just less than the exhaust so that negative pressure in the tent is achieved (since the exhaust is losing efficiency from the filter, slowing the intake is a must to achieve the pressure differential)
I am not certain this is a fix however any input is appreciated! Ideally this tent should be pulling 7LB per grow and its been around the ~4 - 4.5LB mark.
Photos below.
Underdeveloped plant, small colas and pistils are curled in and off-white
Developed plant, in line with the air and has white pistils showing poking out healthy. Photo is old but calyxs have begun to swell and stack where the underdeveloped appears to be behind.
My set up is as followed.
- Cyco Platinum Series Nutrients
- 2.4m x 2.4m x 2.3m Tent (7.8ft x 7.8ft x 7.5ft)
- 4x 600W HPS
- 8" Exhaust with Carbon filter (rated at 688m³/hr or 11.16m³/minute, assume 20% loss from the filter)
- 2x 6" Intakes at 330m³/hr or 5.5 m³/minute
- 2x Oscillating fans on opposite corners
The tent volume is 13.25m³.
In a smaller tent, running the same exact setup I was yielding consistently high and without issue, but when going to this tent in particular the issue arose as the volume was larger and I'm trying to dial in the fan and air situation.
Tent maintains 26c (78f) and 70% humidity, water, nutrients etc are all the same for all plants.
Originally I had an 8" exhaust and an 8" intake and I was getting positive air pressure, and that only became worse with the carbon filter attached so I swapped to the two 6" fans to obtain negative air pressure however the past two grows have rendered the same issue.
The fans are at opposing sides of the tent, the intake is at the floor level and the exhaust is at the roof.
Moving into week 5 some of the plants appear to be underdeveloped and this continues to show throughout the grow however the past two grows 2-3 plants were fine and growing normally and 2-3 were not, showing small colas and pistils that weren't sticking out, they were curled in and an off-white colour compared to the healthier plants which had bright white pistils that were poking out all over.
The plants that were fine were in direct path of the intake fan to the exhaust fan, the ones that weren't doing so well were on the perimeter of the tent out of the direct path of the fans and considering they're all in the same environment, receiving the same food, water, light etc I can use process of elimination to lead me to believe the air is the perpetrator.
Since changing to the 2x 6" intakes recently there has been a slight change in the plants that were underdeveloped and they seem to be catching up however I'd like to be certain this repeating issue is over so I'm planning on getting a fan speed controller and dialling back the intake to be just less than the exhaust so that negative pressure in the tent is achieved (since the exhaust is losing efficiency from the filter, slowing the intake is a must to achieve the pressure differential)
I am not certain this is a fix however any input is appreciated! Ideally this tent should be pulling 7LB per grow and its been around the ~4 - 4.5LB mark.
Photos below.
Underdeveloped plant, small colas and pistils are curled in and off-white
Developed plant, in line with the air and has white pistils showing poking out healthy. Photo is old but calyxs have begun to swell and stack where the underdeveloped appears to be behind.
