is 80 cfms sufficient airflow?

Is that a small propeller fan in 4" round duct? 120v from home depot/wal mart?

It doesn't really move a full 80 CFM, its rated to be a "duct booster", designed to be placed in an ac/heating system that already has a blower, and just boost the air through a single duct. I cant speak with any actual CFM figures I don't own a velometer. Keep in mind duct length/construction (# of elbows) greatly reduce total CFM.

I cannot speak for sizing a 600w light in a small grow tent since I have no experience with that setup. Mine is larger and has a fair amount of passive intake, and less lighting, and one 4" inline room exhaust works well in a 65 degree basement with a 400w light. I also allow a fair amount of passive intake air - very important for keeping temps down.

In a smell proof situation if thats what you are after with your tent you will need a strong exhaust and plenty of intake to keep it in a negative pressure (always pulling air in, no smell leak) and keep temps down.

-Moto

 

No its not. I have a 400w HPS tube with a 6inch inline fan. You can go on amazon get it for 24 bucks. With just that air in my grow tent is about 78-80. I added another 6 inch to suck out ambient air surrounding the tube.

I would suggest a duct going into your tube, duct going out and a fan pulling air then another set up to suck out ambient.

 

You want air to be 100% exchanged in 5 min or less.
Height x width x depth = x / 5 = your cfm at very least.

so... 4 x 4 x 7 = 112 CFM. 112 / 5 = 22.4 cfms.
Get an inline fan and you'll be good. Duct boosters just help move air through a duct...but it has to be already moved by some sort of inline fan...