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The cola bud is bigger than lower buds because of apical dominance and not because the fan leaves are blocking the light. At least that is my understanding..but I'm a novice grower. It's also my understanding that fan leaves feed the buds, and they feed by means of photosynthesis. In other...

Leaf purpling is due to a temp differential between day and night of 30 F. Bud purpling is due to genetics.

In case anyone is interested in GSC or any of the UTGL seeds, here is more info: https://www.uptowngrowlab.live/girl-scout-cookies-cannabis-seed-review-by-uptown-growlab-live

26 days from 12/12.

Very easy. All rock hard nugs.

My last delivery of Mephisto was subpar and Dinafem were shut down a few weeks ago by Spanish police. I'm growing photos for now as I don't feel like taking a chance on other unproven auto companies. Those two were my favorite. It's a shame because photos are about 4 months from start to finish...

This is the formula for ambient capture of VOC and particulate. You seem to be conflating with resistance and static fan pressure which usually apply to source capture - such as losses because of runs of ducting, bends, etc. The short piece of duct that most novice growers here use won't...

Airflow / volume = ACPH The Air Changes Formula To calculate room air changes, measure the supply airflow into a room, multiply the CFM times 60 minutes per hour. Then divide by the volume of the room in cubic feet...

I use carbon too, but just for odors.

The carbon filter/fan assembly is designed for filtration and not for cooling. Cooling the space is a whole different thing. Does the filtering fan also help to cool the space? yes...but that isn't its primary purpose. My responses were for the OP who seemed to be asking how to calculate...

You're being obtuse. I use the same math for a $50k exhausting system that I use for a cheap amazon system. The "cheap" part is merely a function of how long it will last. The manufacturer doesn't know the size of the space their fan will be used in...that part is the "unknown" here...

15 ach is the number for cannabis odor and cfm x 60 / volume is how you get there. The carbon filter you buy on amazon isn't operating outside the laws of basic filtration.

A starting point with all VOC and pollutants is knowing the requisite number of ach that pertain directly to it. These are all averages that are relevant no matter where you live.

Sorry but that last statement is factually incorrect. Carbon doesn't scrub odor if the air is moving too quickly through it...and it is *all* about math. The carbon filters people commonly buy on amazon are barely adequate...all the more reason not to have too many cfm.. More here...

Whether it's a room or a tent, the calc is the same. The ach requirement is the same too.

The title of the thread is "too much cfm?" He also asked: "what am I missing in these calculations?" I'm a novice pot grower but my day gig is applications engineering. The cfm x 60 / volume was an answer to both of those questions.

19 days from 12/12.

Not complicated at all. That stat comes from General Carbon and is based on EPA and OSHA recommendations. There's an ach number for every type of airborne VOC and particulate known to mankind. Height above sea level is a major factor in airflow calcs too. 15 ach is a good average anywhere on...

Thanks friend :bigjoint::bigjoint::bigjoint:

An 8" fan will turn that little space into a wind tunnel. You actually need 10-15 ach (air changes per hr) for cannabis scrubbing - too many cfm and the odor doesn't get enough "dwell time" in the carbon and the odors won't be scrubbed properly. Your tent is 2 x 4'...but since we're...