3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver, HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair

This is true professional AC duct tape. Very good specifications. I used it to tape up our water heater exhaust duct.

The gold standard in foil tape. This sticks really well. This tears very easily and can be installed on existing vents to fix air leaks. I've been doing this around my registers so air doesn't escape underneath the floor. Worth the price over cheaper foil tapes.

Purchased for A/C ducts in the attic, the insulation was torn and falling off. This seems to be top quality tape, very sticky, cuts with heavy duty scissors or shears, a little pricy, but you get what you pay for! All the other 3M products I purchased have been of top quality! I most likely will need a second roll of tape to really secure the duck work, it even looks good and professional, words often not used when I do a job!

Great tape! Unfortunately received dirty and not as described from seller! I use this tape all the time…best tape for my needs! This item was Described as "Looks and functions as if it were new. Item will come in original packaging.” sold by Amazon.com Services, Inc. Unfortunately it was not in it’s original packaging…and a plastic bag over it. It was also dirty. I will keep it and use it anyway. Wish the description was more accurate…I paid too much for the condition I received!

If you need to use tape to stick something to your vehicle, this is the tape to use. I've used it the last few years to tape insulation around the bottom of my RV and works great. When you need to remove it, it does not leave any residue at all. It fairly easy to remove. Be sure you clean the area before trying to apply it, especially from moisture.

I mean really...it's a 3M tape/adhesive product so why cut corners? In my opinion 3M is the only reasonable answer to the question of what brand of tape to buy no matter what your primary trade is. Happy with this purchase and will buy again as needed.

This is the good one, this stuff is tough too. I always like to have some on hand for projects around the house. You’d be surprised how useful this tape can be once you have some on hand. My dad always used this at work (HVAC) so I’ve learned over the years how to properly use this tape to make my A/C more efficient. This is great for taping up cracks around your furnace or condenser coil. You can also use it to tape the chill line near the outside unit if your lines have areas that are exposed, or if there are places that are beginning to be exposed. You can buy cheaper brands, but there’s some things you shouldn’t buy off brand, and this one of them. Buy the legit 3M tape, it’s worth it. It’ll save you money in the long run as you won’t constantly be having to patch up previous applications. I’m not a certified HVAC tech, but after riding with my dad from elementary school until I graduated, I do know to highly recommend this specific tape. This can also be used on small windows, such as the small window panes on some front/back doors, and for lots of other applications. If you’re a homeowner, I truly believe a roll of this tape should be in your home tool box.

This tape was used on an air duct of a large woodworking dust collector. I had to take apart a duct to clear some larger pieces of wood that got caught in a corner of the installation. This tape was used for the original installation, so I bought more of the same when it needed to be taken apart and redone . The original tape made it through freezing winter temperatures, and now the new tape is taking the springtime heat (accentuated by being near a west-facing wall) without any problems. Definitely 'thumbs up' for a product that works exactly as it should!