Does this ship discreet?

Mine sure didn't.... even after I selected to have it shipped in a plain box.... nope.

which ventilation system would you suggest?

Mostly this depends on what kind of lighting you're using ie. if you're using 600w hps or bigger you're going to want an enclosed hood with 6" ports, a nice 6" inline exhaust fan I can follow up with examples if you need, but you would also want to exhaust that heat directly out of tent preferably out of the building as it will heat an insulated 1 car garage comfortably in the winter time. Next you'd want an inline duct booster to bring cool air into the tent periodically as well as if and/or when the tent temperatures exceed 78°F-82°F. Using 6 4Ft T5HO bulbs I haven't logged the temperature exceeding 80° in a 70° climate controlled environment no active ventilation. You could likely use LED lights just as effectively but I recommend at least having a duct booster and exchanging the air periodically under both circumstances because even without excessive heat if there isn't enough heat generated to induce a passive flow your plants will have CO2 depleted air which results in slower growth to say the least you'd want to look into yeast fermentation which albeit cheap adds up over time, more simple to bring in fresh air.

What are the size of the duct port openings?

6 inch vent holes with draw strings to pull it tight.

How many plants can fit in tent?

Depends on the size, but I have 12 three-gallon potted tall bushy plants in there, and could squeeze in 4 more to total 16 if they don't get too big

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🌱 Grow smarter, not harder — the tent that means business.

BUILT TO ENDURE SUPPORT - Robust 22mm thick metal poles and reinforced nylon connectors hold up to 165 lbs, combining strength with sleek design.
OPTIMIZED AIRFLOW CONTROL - Double cinch duct ports and multiple ventilation options keep your grow environment perfectly ventilated and odor-free.
EFFORTLESS CONTROLLER SETUP - Integrated mounting strip for easy controller hanging, streamlining your hydroponic management like a pro.
SMART OBSERVATION CLEANLINESS - Convenient viewing window lets you monitor growth without disruption, while the removable floor tray keeps your space spotless.
MAXIMIZE YOUR GROW LIGHT EFFICIENCY - High-density 600D oxford fabric with 100% diamond reflective mylar walls ensure zero light leakage and multi-dimensional illumination.

The VIVOSUN G448 Glow Tent is a premium 4x4ft hydroponic grow tent featuring 100% diamond reflective mylar for superior light efficiency, a sturdy 22mm metal frame supporting up to 165 lbs, and advanced ventilation ports with double cinch duct seals. Designed for professional growers, it includes a viewing window and removable floor tray for easy monitoring and maintenance, plus a controller mounting strip for streamlined setup.

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Manufacturer	VIVOSUN
Model Number	GT-0003
Package Dimensions	124.7 x 28.2 x 22.2 cm
Material	nylon Iron metal
Color	gray
Size	48"x48"x80"
Package Weight	14.89 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	VIVOSUN
Capacity	165 Pounds
Item Weight	14.89 Kilograms

VIVOSUN G448 48"x48"x80" Glow Tent 4x4ft Advanced Grey Glow Tent with 22mm Pole Observation Window and Floor Tray for Hydroponics VS4000/VSF4300

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