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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🖤 Flex your airflow with AC Infinity’s heavy-duty ducting — because your space deserves the best!

UNMATCHED DURABILITY - Four-layer design resists leaks, tears, and cuts for long-lasting performance.
VERSATILE VENTILATION - Ideal for HVAC, grow rooms, dryers, AV racks, and more — elevate your airflow game.
CUSTOM FIT CONVENIENCE - Cut-to-length aluminum and thermoplastic tube adapts perfectly to your unique setup.
EFFORTLESS FLEXIBILITY - Steel-wire spiral structure bends easily to fit tight or awkward spaces without hassle.
COMPLETE INSTALLATION KIT - Includes two stainless steel 4-inch duct clamps for secure, professional-grade mounting.

The AC Infinity Flexible 4-Inch Aluminum Ducting features a robust four-layer construction combining aluminum foil and PVC thermoplastic for superior durability and leak resistance. Its internal steel-wire spiral ensures flexible installation in tight spaces, while the 8-foot length and included stainless steel clamps provide a customizable, secure ventilation solution ideal for HVAC, grow rooms, dryers, and AV equipment cooling.

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€ 69.07

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TrustScore 4.5 | 7,300+ reviews

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Brand	AC Infinity
Material	Alloy Steel
Colour	black
Product Dimensions	2.44L x 0.1W Meters
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
Department	All Ages
Country of Origin	USA
Item model number	AI-DTA4-8
ASIN	B07WRDTX4C

AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 8-Feet Long for Heating Cooling Ventilation and Exhaust, Black

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