CFM Overkill, Outcomes and Consequences?

Setup:
Homebox 4.6w x 4.6d x 6.6h
2 Air Cooled - Cool Sun 600w Hoods and Lumatek 120v Ballasts
Vortex 6" Centrifugal Fan @ 449 CFM
Roughly 6 Feet of 6" Flexible Aluminum Ducting

I've been having some issues with the sides of my tent being sucked inwards and posted that here:https://www.rollitup.org/newbie-central/313245-another-fan-necessary.html

I plugged my grow space specs into a CFM calculator and was given 140 CFM is the ideal number needed to change the air every 1 minute. My inline fan is rated @ 449 CFM's and is setup to pull air through the lights, draw it over the Vortex fan itself, and push the hot and exchanged air out of the top of the Homebox. To try and curve the bowing problem(s) I opened up the flaps on the sides and all of the remaining ports. I feel comfortable that the temps aren't going to be a problem with that much draw out of the temp. I am not 100% on humidity remaining optimum but I already have a humidifier for that. In you guys' opinions, am I going to run any risks of exposing my plants to problems with oxygen deprivation or plant stress by leaving my setup as is or should I change something up here?

Thanks.

i think the biggest thing you'll notice is an increase of water usage due to higher transpiration rates because of the high rate of airflow.
if your running hydro, cut back on your ppm to avoid burning from the faster uptake of h20, if your in soil run your nutes 1/2-2/3 strength and keep an eye on the soil moisture levels. might want to skip a feeding and give em straight water too.

IAm5toned said:

i think the biggest thing you'll notice is an increase of water usage due to higher transpiration rates because of the high rate of airflow.
if your running hydro, cut back on your ppm to avoid burning from the faster uptake of h20, if your in soil run your nutes 1/2-2/3 strength and keep an eye on the soil moisture levels. might want to skip a feeding and give em straight water too.

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Thanks for the quick response and I am growing DWC w/the Fox Farm Complete Hydro Line (Grow Big, Tiger Bloom, Big Bloom, Open Sesame, Beastie Bloomz, & Cha Ching) with 3/4 of their recommended feed schedule. Would you suggest I take it down to 1/2 strength sir?

Thanks.

my experience with hydro is very limited as compared to alot of people on here, but the going theory is to start out @ 1/4 strength of manufacturers recipe and gradually build up to roughly 1000 ppm. NPK depends on what stage your in as far as growth.

start out nutes at 1/2 strength (about 300 ppm for me) then by 2nd week of veg full strength (600 ppm) and by the time I throw them into flower in week 6 they are at about 900 ppm. I run rockwool cubes in net buckets with a t5 for veg you can check it out in my signature link. I would get a fan speed controller btw and slow your fan down a bit

IAm5toned said:

my experience with hydro is very limited as compared to alot of people on here, but the going theory is to start out @ 1/4 strength of manufacturers recipe and gradually build up to roughly 1000 ppm. NPK depends on what stage your in as far as growth.

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Even with your limited knowledge on the subject of hydro growing, I sincerely thank you for giving me your honest insight and opinions here.

JonnyCloss said:

start out nutes at 1/2 strength (about 300 ppm for me) then by 2nd week of veg full strength (600 ppm) and by the time I throw them into flower in week 6 they are at about 900 ppm. I run rockwool cubes in net buckets with a t5 for veg you can check it out in my signature link. I would get a fan speed controller btw and slow your fan down a bit

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Is there a specific brand of fan controller you recommend I look at purchasing and would the lowest setting be the ideal place to start when I throw one on the tent?

Thanks peeps.