Is the material safe? Does it emit any harmful chemicals when heated? Thanks

Not that I have noticed but I would not allow over 120f degree air to travel through this. Use all metal flex or rigid metal for that application.

whats the best way to connect this to my existing 5" vent hose?

Get a sheet metal reducer 5” to 4” 30 gauge sheet metal reducer, some large zip ties or duct clamps and maybe some venture tape to make a better seal. I suggest staying the same size or increasing though to 6” depending on lengths of ductwork.

When used with portable ac does the duct give off heat or is it insulated enough to stay cool?

It can give off some heat. You can go to any hvac supplier and get insulated flexible duct of basically any size. R-4, R-6 and R-8 insulation factors I believe.

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Hon&Guan 3 inch 16 FT Long Air Ducting, Heavy-Duty Three-Layer Protection Dryer Vent Hose for Heating Cooling Ventilation and Exhaust, Grey

Product ID: 361105697

Details

Brand
Hon&Guan
Colour
Gray
Item length
192 Inches
Item weight
544.31 Grams
Material
PVC Aluminum

🔄360° rotatable flexibility

🔥Heat resistant -22℉ to 185℉

🛡️3-layer tear & puncture resistant

Description

🔥 Flex your airflow game with Hon&Guan’s heavy-duty ducting! 🛠️

READY OUT OF THE BOX - Comes with 16 feet of ducting and 2 stainless steel clamps for quick, secure setup—no extra parts needed.
HEAT RESISTANT RELIABILITY - Withstands extreme temperatures from -22℉ to 185℉, perfect for hot, humid, or cold environments.
VERSATILE VENTILATION SOLUTION - Ideal for grow rooms, dryers, portable ACs, and HVAC systems—integrates effortlessly with filters and fans.
FLEXIBILITY THAT FITS YOUR SPACE - 360° rotatable design with included clamps for seamless installation in tight or complex setups.
BUILT TO LAST ENGINEERED TO PERFORM - Heavy-duty PVC, PET & aluminum foil layers ensure zero air leaks and maximum durability.

The Hon&Guan 3 inch x 16 ft insulated flexible duct combines a robust three-layer construction of PVC, PET, and aluminum foil to deliver superior tear resistance and airtight performance. Its 360° rotatable flexibility and included clamps enable easy installation in tight spaces, while its heat resistance from -22℉ to 185℉ ensures durability in diverse HVAC, dryer, and ventilation applications. Trusted by professionals for reliable airflow management and long-lasting use.

Specifications

ASIN	B07QG1F4YZ
ASIN	B07QG1F4YZ
Brand Name	Hon&Guan
Color	Gray
Customer Reviews	4.5 4.5 out of 5 stars (139)
Customer reviews	4.5 4.5 out of 5 stars (139)
Date First Available	20 March 2021
Included Components	2PCS Clamps, 3 inch duct hose
Is Discontinued By Manufacturer	No
Item Length	192 Inches
Item Type Name	3 inch duct hose
Item Weight	544.31 Grams
Item model number	75mm X 5m
Manufacturer	Hon&Guan
Manufacturer	Hon&Guan
Material Type	PVC Aluminum PET
Product Dimensions	31.75 x 8.38 x 8.13 cm; 544.31 g
Unit Count	1.0 Count

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