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

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!

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.

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.

Great product but is covered in advertising for 3M. Good thing is I was able to remove the printing with thinners.

This tape is easy to use and very sturdy. It does not easily tear apart and should last for a long time. We actually used this tape to adhere insulation to a home made grill. It worked great. The grill gets hot and the tape has stayed on securely. It proves that it will hold up for other HVAC projects too.

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!

This tape really works well. First off, you can cut off whatever amount you need for a job before peeling the backing off. It is not sticky until you remove the backing, but then it sticks as it should. The backing also allows you to cut down the length of the tape, thereby making tape that is less than 2.5" wide for tight spots. I have previously used some types of duct tape without the removable backing, and as the tape ages a while, it becomes stuck to itself and impossible to use; I don't think this product will have that problem. I would definitely but this again.

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.