Is this safe to vent a portable ac? ac's can get really hot.

I've never owned a portable AC. If there is a 4" circle shaped vent hole on the portable AC, it should tolerate the heat. Stationary ACs condensate water, there is no vent hole.

anyone use this for garage auto exhaust tube?

I am currently using this to exhaust the air in my wood shop

Is this suitable for marine use?

No paperwork came with it indicating whether it is USCG compliant (if there is such a requirement). If you want to use it as a duct for a bilge blower, I would say go ahead and use it. If you are concerned about fire retardancy, I suggest you contact the seller first.

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Description

🌬️ Flex your airflow with heavy-duty style and precision!

SECURE RELIABLE - Includes two stainless steel 4-inch duct clamps for a tight, leak-proof seal every time.
TAILORED TO YOUR SPACE - Cut-to-fit 8-foot length adapts perfectly to your HVAC, grow room, or exhaust needs.
VERSATILE VENTILATION SOLUTION - Ideal for hydroponic grow tents, bathrooms, attics, AV rooms, and more—upgrade your airflow game.
BUILT TO LAST DESIGNED TO FLEX - Four-layer aluminum and PVC construction resists leaks, tears, and cuts for unmatched durability.
EFFORTLESS INSTALLATION ANYWHERE - Steel-wire spiral design bends easily to fit tight or hard-to-reach ventilation spots.

The AC Infinity Flexible 4-Inch Aluminum Ducting offers an 8-foot length of durable, four-layer aluminum and PVC tubing reinforced with a steel-wire spiral for maximum flexibility and strength. Designed for HVAC, grow rooms, and ventilation applications, it includes two stainless steel clamps for secure installation, making it a versatile and reliable solution for professional-grade airflow management.

Specifications

Brand	AC Infinity
Material	Aluminum, PVC
Color	White
Product Dimensions	96"L x 4"W
Item Weight	0.48 Kilograms
Nominal Wall Thickness	0.25 inches
Outside Diameter	4 Inches
Item Length	8 Feet
UPC	819137021020
Manufacturer	AC Infinity
Specific Uses For Product	Hydroponic grow rooms and tents, Bathrooms and attics, Heating and cooling transfer, AV equipment rooms, closets, racks, and cabinets
Global Trade Identification Number	00819137021020
Part Number	AI-DTA4-8
Item Weight	1.06 pounds
Item model number	AI-DTA4-8
Is Discontinued By Manufacturer	No
Size	4 Inch
Style	Modern
Shape	Round
Installation Method	Ceiling Mounted
Item Package Quantity	1
Included Components	Two stainless steel duct clamps
Batteries Included?	No
Batteries Required?	No

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