METAL-FAB 4MFS Vent Firestop

( Brand: Metal-fab ), ( Type: Chimney Cap ), ( Manufacturer Part Number: 4MFS ), ( Item Width: 4 In )

Review METAL FAB Inch B vent Firestop

Introducing the Metal-Fab 4MFS B-Vent Firestop, a high-performance firestop solution designed to meet the stringent requirements of modern fire protection systems in commercial and industrial applications.

The 4MFS B-Vent Firestop is a UL-listed, factory-assembled, non-combustible firestop system specifically engineered for use in B-Vent applications, where combustible materials are used in the construction of the vent. This firestop system is suitable for use in openings around B-Vent applications in masonry and concrete walls, as well as in metal stud and concrete frame applications.

The 4MFS system comprises a series of interconnected, pre-insulated, and factory-assembled firestop components. These components include a bottom seal, a top seal, a thermal insulation layer, and a fire-resistant damper. Each component is designed to work in harmony to provide a robust and effective firestop solution.

The bottom seal is made of a flexible, non-combustible material that conforms to the irregularities of the wall opening, ensuring a tight seal against the penetrating vent. The top seal is a fire-resistant, self-adhesive gasket that seals against the underside of the vent cap, preventing the passage of fire and smoke.

The thermal insulation layer is made of high-density, mineral-wool insulation, which provides excellent thermal insulation properties and helps to maintain the temperature difference between the two sides of the firestop. This insulation layer also acts as a sound barrier, reducing noise transmission through the vent.

The fire-resistant damper is a critical component of the 4MFS system. It is designed to close automatically in the event of a fire, preventing the spread of fire and smoke through the vent. The damper is tested to meet the UL 1784 Standard for Fire Dampers and is available in various sizes to accommodate different vent sizes.

The 4MFS B-Vent Firestop is easy to install, as it comes fully assembled and pre-insulated. It can be installed quickly and efficiently, saving time and labor costs compared to traditional field-installed firestop systems.

In addition to its excellent firestop performance, the 4MFS B-Vent Firestop also offers other benefits, such as improved energy efficiency, reduced air infiltration, and improved acoustic performance. It is also designed to be compatible with a range of vent sizes and wall materials, making it a versatile and flexible solution for various firestop applications.

Overall, the Metal-Fab 4MFS B-Vent Firestop is a high-performance, factory-assembled firestop system that offers excellent fire protection, thermal insulation, sound insulation, and ease of installation. It is an ideal solution for commercial and industrial applications where B-Vent firestopping is required.

Metal-fab 4MFS B-vent firestops are fire-resistant devices designed to maintain the integrity of fire-rated walls and partitions by sealing around B-vent fireplaces and chimneys. In considering whether to purchase these firestops, here are some pros and cons:

1. Compliance with Fire Safety Regulations: Installing metal-fab 4MFS B-vent firestops ensures that buildings adhere to fire safety codes and regulations.

2. Fire Protection: These firestops prevent the spread of fire, smoke, and heat from one side of a firewall to the other, thereby reducing the risk of fire damage and potential loss of life.

3. Durability: Metal-fab 4MFS B-vent firestops are made of durable materials, ensuring a long lifespan and reducing the need for frequent replacements.

4. Easy Installation: These firestops can be installed quickly and easily, minimizing the disruption and cost associated with renovations or new construction projects.

1. Cost: Metal-fab 4MFS B-vent firestops can be more expensive than other types of firestops due to their superior fire-resistant properties and durability.

2. Limited Size Options: These firestops are available in specific sizes, which may not accommodate all B-vent fireplace and chimney configurations.

3. Potential for Leaks: If not installed correctly, metal-fab 4MFS B-vent firestops can leak, compromising their ability to prevent the spread of fire, smoke, and heat.

In conclusion, while metal-fab 4MFS B-vent firestops offer significant fire protection benefits and durability, they come with a higher cost and limited size options. However, the importance of fire safety and the potential risks associated with non-compliance make the investment worthwhile. To ensure the best possible outcome, it is recommended to work with a qualified and experienced installer to properly size and install these firestops.

Details:

part #: 4mfs prices

• $21.62-$76.54

specifications stoveace:

• brand: Metal-fab
• type: Chimney Cap
• manufacturer part number: 4MFS
• item width: 4 In

offer stoveace:

• availability: In Stock
• started: July 29, 2025
• options: Ship-to-home
• sold: 0
• best offers: True
• quantity: 31

shipping stoveace:

• class: Standard, Expedited, One-day
• transit: 3-8 Days
• cost: $10.15
• service: USPS Ground Advantage, USPS Priority Mail, UPS Next Day Air
• carrier: USPS, UPS
• type: Calculated

returns stoveace:

• method: Money back
• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

general stoveace:

• Heating, Cooling Air > Fireplaces Stoves > Fireplace Stove Accessories
• condition: Open box

seller stoveace:

• city: Vancouver, Washington
• # reviews: 10919
• rating: 100.0%

payments stoveace:

• other
• credit card: Visa
• wallet: Paypal

Metal-fab 4MFS Is Similar To:

• American Metal 6hs-24 6 Inch X 24 Insulated Triple Wall Chimney Stove Pipe (33.1% similar) American metal 6 X24 insulated triple wall chimney stove pipe 6HS-24: sections combine corrosion-resistant stainless steel and sturdy galvanized for strong chimney construction. Free shipping 48 states. Part number: 6818785. Combination of resistant stainless steel and galvanized...(June 4th, 2024)
• American Metal 6hs-030 Two 6 Inch Triple Wall Stove Pipe Chimney Elbow Offsets (30.4% similar) Part number: 7845910. Free shipping 48 states. American metal. Sold in pairs to permit chimney go around joists, rafters, or other projections. American metal two 6 triple wall stove pipe chimney elbow offsets. 30 chimney elbow offsets. Oem-d hazardous materials products...(June 4th, 2024)
• Gray Metal Products 6-24-600 6 Inch X 24 Gauge Heavy Duty Black Stove Pipe (33.1% similar) 6 x 24 gauge heavy duty black stove pipe. Oem-d hazardous materials products must be shipped ground. Part number: 8365108. 24 gauge extra heavy. Free shipping 48 states...(June 8th, 2024)
• Amerivent 095029320024 Lot Of 3 American Metal 3eal Ameri Vent Adjustable Elbow Inch (24.4% similar) Listed: James crushing. And many more. Office depot. Constructed of four sections for smoother bends and less resistance round shape. Gas vent elbows 90 degree - adjustable double calamari-vent size 3 inches lightweight air-insulated, double-wall metal construction with an inner pipe of...(June 8th, 2024)
• Sonret Fab-381 Burn Barrel Grate Perfect For 30-55 Gallon Metal For (29.3% similar) Brand: sonnet. Material: carbon steel. Manufacturer: FAB-381. Fuel type: wood. Reduced smoke: this fire wood outdoor stove grate ejects the fuel off bottom of barrel smoker grate, reducing smoke and resulting a cleaner burn for 55 gal steel drum kit. Product dimensions: 17 l x 10 w...(June 8th, 2024)
• Soler And Palau Sy66-8 Steel 6x6x8 Inch Y Sheet Metal Adapter (35.2% similar) As a bonus, most items ship for free. Heston KRD365-NAG Kurd series 36 w 5.8 cu. Solder and parlay SY66-8 6X6X8 y sheet metal adapter...(June 12th, 2024)
• Soler And Palau 812482011654 Sy-6 Steel 6 Inch Y Sheet Metal Adapter (33% similar) As a bonus, most items ship for free. Solder and parlay SAY-6 6 y sheet metal adapter. Casablanca 99063 toffee tropical leaf glass bowl for 99023...(June 12th, 2024)
• Neuman Rd112 Vintage Chimney Cleaner Sweep Round Metal Model 112 Fits Sizes 6 Inch To 11 (28.1% similar) Couple of the cleaning rods are bent a little. Vintage Newman chimney cleaner sweep round metal model 112 fits sizes 6 to 11, previously used. Please see pictures for details on condition...(June 14th, 2024)
• American Metal 6hs-rcs Round Triple Wall 6 Inch Vent Pipe Cap (37% similar) Oem-d hazardous materials products must be shipped ground. Stove pipe cap. Free shipping 48 states. Part number: 6846018. Built in spark arrest. Features: 6 size. Protects against rain, debris and birds entering chimney. Designed for those who prefer the of a round termination...(July 21st, 2024)
• Gray Metal Products Bm0023 6-24-602c 6 Inch 24 Ga Black Stove Pipe Corrugated Elbow (29% similar) Part number: 8483968. 6 corrugated elbow. Free shipping 48 states. Gray metal products 6/2 4 GA. Black stove pipe corrugated elbow. Oem-d hazardous materials products must be shipped ground...(July 21st, 2024)
• Corr guard 3cgv12-1 Metal-fab Corr guard Water Heater Vent Pipe 3cgv12-height 12 Inch (27.3% similar) The pipe has a diameter that can be seen in the picture and width is approximately 12 inches. Made of aluminum/steel, it is durable and long-lasting. The model is designed to be 12 inches high and comes with a guard. This vent pipe is ideal for use in chimneys and compatible with a variety of...(July 24th, 2024)