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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AC Infinity Flexible 4" Aluminum Duct Heavy Duty 4-Layer Protection for Heating, Cooling, Ventilation and Exhaust - 8 Feet Long

AC Infinity Flexible 4" Aluminum Duct Heavy Duty 4-Layer Protection for Heating, Cooling, Ventilation and Exhaust - 8 Feet Long

Product ID: 727848169

Details

Brand
AC Infinity
Color
Black
Item Length
8 Feet
Item Weight
0.48 Kilograms
Manufacturer
AC Infinity
Material
Aluminum PVC

🌀Flexible steel spiral core

✂️Customizable 8 ft length

🛠️4-layer heavy-duty durability

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Description

🌀 Elevate your airflow game with flexible, fireproof durability!

TAILORED TO YOUR SPACE - Cut-to-fit 8-foot length adapts perfectly to any ventilation setup
COMPLETE INSTALLATION KIT - Includes 2 stainless steel clamps for secure, hassle-free mounting
FLEXIBILITY MEETS FUNCTION - Steel spiral core bends easily for tight, hard-to-reach spaces
VERSATILE VENTILATION SOLUTION - Ideal for HVAC, hydroponics, drying rooms, and AV cooling
BUILT TO LAST DESIGNED TO PERFORM - 4-layer aluminum & PVC construction resists leaks, tears, and fire

The AC Infinity Flexible 4" Aluminum Duct features a robust 4-layer design combining fire-resistant aluminum and leak-proof PVC, reinforced by a flexible steel spiral core. Measuring 8 feet and easily cut to size, it includes stainless steel clamps for secure installation, making it the go-to duct for professional-grade ventilation in HVAC, cultivation, and cooling applications.

Specifications

ASIN	B07WRDTX4C
Amazon Bestseller	#173,776 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #386 in Industrial Duct Hoses
Brand Name	AC Infinity
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (11,027)
Global Trade Identification Number	00819137021020
Item Length	8 Feet
Item Weight	0.48 Kilograms
Manufacturer	AC Infinity
Material Type	Aluminum, PVC, Stainless Steel
Outside Diameter	4 Inches
UPC	819137021020
Unit Count	1.0 Count

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