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 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.

Genuine 3M product, Quality as expected, Easy to cut to the correct size before placing it, with the backer paper protecting the sticky side, but sticks were you put it. I used this to patch some gaps in aluminum ductwork directly below the furnace output, and it has stayed stuck through both Heating and Cooling cycles.

I have been doing heating and air conditioning with going to school over 30 years ago. Yes, you will find much aluminum tape that is less expensive on Amazon for sure. I have always used this with it being made by 3M knowing how good it is and would say out of all different aluminum tapes. I’ve used this is 10 times better than any other tape I ever used. Surprises me it’s not much more expensive with how unbelievable it really is and if you purchase it versus cheaper ones, you know by the odor of the adhesive that is on it. Other stuff I’ve used did not only stick the greatest. Yes it’s stuck on any ductwork. I put it on this made by 3M. Wow. Even if you do not do HVAC for a living and need aluminum tape, this is beyond your best choice believe me.

I would have given this product 5 stars except for the fact that no disclaimer or warning was given about the tape when it gets heated. The Acrylic adhesive has to cure. When I used it on my oil furnace venting pipe, it really stunk up my whole basement & the strong odor came upstairs. It was so strong of a chemical smell, I had to get up and remove the tape at 2:00 in the A.M. . The odor got better after the pipe cooled down, but we could still smell a faint odor for several days after in the basement, but not in our living areas. Bottom line is this, the tape does what it's supposed to do, but you need to really ventilate the area (for a day or two at least) if the tape gets heated. Use fans, open windows etc. I have not used it on any cold piping, but the acrylic adhesive gives the tape a strong smell even when cool.

Works and sticks good sealing duct frame for filters. USN came out with duct tape, submarines would use it to stick problem people to ceilings (no joke)

Good tape, used for taping seams between foam boards. Better than when you can get at hardware stores

Are use this product to stop the condensation from happening on my main air handler in the garage. It would drip water, causing the drywall joint compound to crack. I applied new tape and have not had any issues cents. The garage is air-conditioned as well, buy a 12,000 BTU, portable Toshiba AC unit. I wrapped the exhaust vent in two places. One where it attaches to actual unit and the other is sealing the infinity exhaust fan. I later realized it is very similar to the sound dampening, I use with mobile audio. I can’t say it will do a lot, but it is aesthetically pleasing. During the transformation of a two car garage into a home theater, I needed to lay a vapor barrier down over the concrete flooring, followed by rigid foam board insulation. This works absolute wonders on the seams of those rigid, foam boarding, preventing any cool air from making its way through.

I tried a cheaper tape wich still wasn't that cheap. Had to learn the hard way 3M is thicker and has more adhesive then the generic brands cant go wrong with 3M Foil Tape. Not gunna show my work though even though it worked. Lol

Ninguna otra cinta había podido funcionar con el tubo del aire acodicinado; colocamos esta y ya lleva algunos días sin que se caiga.

I use this on clean, oil free duct work. Yes this is an expensive foil tape (cheaper if you buy it by the case) but the cold weather tack is effective and the adhesion will last for years even with the temperature cycles. I prefer the the thicker tapes (this is one of them) and 3M uses a quality adhesive. Tack is when the tape is first applied (TO A CLEAN SURFACE) and adheres to the surface. Adhesion is the ability to remain attached to the surface for a length of time and through temperature cycles. Flagging is the tape releasing from the surface (Adhesion has failed) and with the cheap tapes this happens in a few years. This is a pressure sensitive tape and MUST be smoothed down with an applicator and NOT just your hand. I believe in doing a job once and to the best of my ability and this tape has met my expectations

Selling fake Product in the name of 3M Returned and again received same product.

This foil tape is easier to work with them most of the other stuff. Great product would highly recommend it.

This tape is great, very thick and sticks nicely to the duct work, sealing the gaps perfectly. Exactly what I needed for our home. The reviews I read before ordering this were spot on, well worth the money.