10 Best 3M Fireplaces
for June 2023

The 3M Fire Barrier Moldable Putty Stix is one of our favorite firestop sealants, thanks to its excellent adhesion and aging properties. Since it's able to resist repeated temperature cycling, it maintains its performance over time. The putty's red color helps it to visually stand out on the job site, and it's available in 1.45-inch and 6-inch length, so it's suitable for most building applications. The putty has a slight odor, but it's hardly offensive. 3M's Fire Barrier putty is also approved for Class A, B, and C firestopping, so it's suitable for use in buildings where fire resistance is required. Its application is simple: simply mix the putty with water until it's the consistency of clay, then apply it to a wall. The putty will harden within 4 minutes, and it's suitable for both interior and exterior applications.

The 3M Fire Block Foam is a fire-resistant foam with a gel-like consistency. It's easy to apply, and its flat surface makes it ideal for sealing around studs, outlets, switches, and switches. The foam seals tight, and it feels solid, unlike many other foams that are softer and more flexible. When we put it to the test, it performed well, reducing air infiltration in one room by 72%, and in another by 61%. The foam's dense consistency also makes it ideal for blocking off rooms during renovations. It's effective, versatile, and easy to work with, and it's the best fire-blocking foam we've seen.

The 3M 3340 Duct Tape is our best choice overall for sealing and patching hot air ducts, both in diameter and length. It's a tough, durable tape that can withstand temperatures as low as -40C (-40F) and as high as 300C (572F). The tape is thick enough to handle even the thickest ducts, and is flexible enough to be wrapped around corners and curves without curling. The adhesive is powerful enough to hold even the thickest material, yet it's still able to release easily, so the tape doesn't leave a sticky mess on your car dashboard or on your duct work. The 3340 is also easy to apply. The poly coated Kraft paper liner protects the adhesive and keeps the tape ready for use. The liner is removable, so the tape can be re-used. The 3340 Duct Tape is UL181A-P and UL181B-FX compliant, so it can be used on metal ducts and ducts made of reinforced fiberglass and rigid fiber glass. The 3340 Duct Tape has been tested by an independent laboratory to meet ASTM D-2567.

3M's Fire Barrier rated foam is the best-performing intumescent foam we've tested. It's easy to install, has strong adhesive qualities, and expands up to 5 times in size upon exposure to fire. 3M's Fire Barrier rated foam is repairable, too. It can be cut with a knife, even after it has undergone expansion, and it can easily be patched with 3M's Fire Barrier rated adhesive. It's also fire-rated for up to 2 hours, so it can be used in many applications, including wall insulation and wood flooring. This foam is softer and more flexible than other foams we've tested, and it doesn't cause the wall or floor to which it is installed to sag. Also, 3M's Fire Barrier rated foam is less expensive than other foams we tested. The only drawback is that it expands to a greater volume during installation, which can make installation more difficult.

If you're looking to stop the spread of a fire before it starts, you can't go wrong with 3M's Fire Barrier Silicone Sealant. It adheres to a wide variety of construction materials, including metal, glass, concrete, stucco, and wood, and it can withstand temperatures up to 1,382 degrees Fahrenheit. (For comparison, 3M's Firestop Silicone Sealant can withstand temperatures up to 1,620 degrees, while 3M's Firestopping Foam Sealant can withstand up to 2,476 degrees.) The sealant's compression and extension capabilities are 13%, and it has a 30-year limited warranty. The sealant is easy to work with, and it's quick to cure, so it's a good choice for quick fixes. In addition, it's fire-rated for up to 3 hours, so it's a good choice for stopping the spread of a fire in a home or office.

The 3M Fire Barrier Sealant FD 150+ is a high-solids firestop sealant, which means it's limited in how much it can shrink as it dries. This characteristic is especially useful in pipes with complex shapes, such as vent and stack pipes, or in pipes that are constantly under pressure from a sprinkler system. The sealant is also re-enterable and repairable, making it particularly useful in buildings where pipes are run through walls, or where pipes pass through floors. The sealant comes in red, and it's easy to apply by using a caulking gun. It's also stain-resistant, and it remains flexible after drying, so pipes don't kink or break. The sealant is fire-resistant, and it's tested up to 3 hours in duration, in accordance with ASTM E 814 (UL 1479) and CAN/ULC S115. The sealant also meets the ASTM E 1966 (UL 2079) fire resistive joint system, and it's tested up to 4 hours in duration. 3M Fire Barrier Sealant FD 150+.

3M's 600-degree heat-resistant tape is an ideal choice for sealing ducts and ducts in high-temperature environments. The durable material is resistant to high temperatures and can withstand exposure to concentrated sunlight. It's sturdy enough to stand up to repeated use and comes in a long 15-foot roll. The tape resists tearing and is easy to apply to surfaces. 3M's heat-resistant tape is safe to use around kids and pets and meets all Department of Energy standards for indoor use. The tape is relatively easy to apply, but it requires patience. The tape is thick enough to stick, but not so thick that it's difficult to cut. The instructions recommend applying a strip of tape, pressing it flat, and peeling it back about 1/8 inch. However, we found it easier to just wrap the tape around one duct section at a time, pressing firmly, and peeling back the tape about 1/4 inch.

This tape is a good choice for repairing an overheated duct. It repairs leaks caused by damaged ducts, temperature changes, or improper sealing. This tape has high resistance to high temperatures. The tape's adhesive is resistant to extreme temperatures and direct sunlight. The tape is also easy to cut and strip. The tape is resistant to heat up to 600 F. The tape is best suited for repairing leaks in hot air ducts. The tape is also useful when repairing cold air ducts. The tape is durable and long lasting.

The 3M Fire Barrier Wrap Strips FS-195+ (formerly 3M Fire blanket) are an excellent choice for sealing a gap between wooden studs and drywall. It's intumescent, so it expands when exposed to heat, creating a heat barrier that seals the gap. It's thin enough to fit between studs, yet durable enough to stand up to prying hands. The foil exterior makes the strips easy to install, and the re-entrant material makes it easy to cut to the needed size. The foil also leaves no residue behind after installation, so cleanup is quick and easy. The strips are self-extinguishing, so they don't pose a fire risk, and the material meets ASTM E 814 safety standards. The strips typically last 10 years, so they'll last through the long-term. They also come in a variety of widths and lengths, so you'll have no trouble finding one to fit each gap.