4BV12 – DuraVent 4″ × 12″ Type B Gas Vent Pipe

4BV12 DuraVent Type B Gas Vent Pipe

4BV12 by DuraVent is a 4-inch by 12-inch Type B gas vent pipe designed for use with compatible listed gas-fired appliances. Its double-wall construction combines an aluminum inner liner with a durable galvanized steel outer wall.

This pipe provides a factory-engineered venting component for properly designed Type B gas vent systems. It should only be installed as part of a compatible system and according to the appliance instructions, DuraVent requirements and applicable local codes.

4BV12 Double-Wall Construction

The 4BV12 features an aluminum inner wall surrounded by a galvanized steel exterior. The inner liner provides the primary passage for combustion gases, while the outer wall supplies additional protection and structural support.

Its double-wall design helps the vent warm rapidly during appliance operation. Maintaining appropriate vent temperatures can help support natural draft and reduce condensation inside a properly configured venting system.

The outer component is manufactured from 28-gauge galvanized steel. The pipe has an internal diameter of 4 inches, an overall exterior measurement of approximately 4.63 inches and a height of 12 inches.

Type B Gas Vent Application

The 4BV12 is a Type B gas vent component. Type B systems are intended only for compatible appliances and fuels specifically identified by the appliance and vent manufacturers.

Never use this product for a wood-burning appliance, solid-fuel system or another application that requires a different chimney or vent classification. High-efficiency condensing appliances may also require special vent materials rather than Type B pipe.

Before ordering, check the appliance rating plate and installation manual. The manufacturer documentation should identify the approved vent type, required diameter, clearances and termination configuration.

Four-Inch Diameter and 12-Inch Length

The 4BV12 has a nominal inside diameter of 4 inches and a pipe length of 12 inches. It is suitable for compatible venting systems specifically designed around 4-inch Type B components.

Vent diameter must not be selected from the appliance connection alone. Input capacity, vent height, lateral length, number of fittings, common venting and local environmental conditions can affect the required size.

A qualified professional should complete or verify the vent-sizing calculation. An incorrectly sized vent can affect draft, appliance performance and safe removal of combustion gases.

UL-Listed Venting Component

The 4BV12 is identified as a UL-Listed component. The listing applies when the pipe is used within its intended venting system and installed according to the applicable manufacturer instructions.

Do not drill through, crush, alter or substitute the listed connection system. Field modifications can interfere with the pipe’s construction and may invalidate its listing or make the installation unsafe.

Compatible Connections

The 4BV12 should be connected only to compatible 4-inch DuraVent Type B gas vent components. Related components may include additional pipe lengths, elbows, supports, flashing, firestops and an approved termination cap.

Do not combine incompatible components simply because they share the same nominal diameter. Different manufacturers may use different locking mechanisms, dimensions and listing requirements.

Every connection should be fully engaged and secured according to DuraVent instructions. Inspect the completed vent route to confirm that all joints remain properly connected and supported.

Professional Installation Required

Installation of the 4BV12 should be performed by a qualified professional familiar with gas appliances and Type B venting systems. The installer must verify vent sizing, clearances, supports, offsets, firestops, roof penetration and termination requirements.

The complete vent must maintain the required clearance from combustible materials. Insulation, framing, wiring and stored objects must not interfere with the clearance specified for the listed system.

The vent route should rise as required and avoid unnecessary horizontal sections or directional changes. Supports must prevent movement, separation and excessive stress on the appliance connection.

Inspection and Maintenance

Have the complete venting system inspected periodically for corrosion, loose connections, physical damage and improper clearances. The exterior termination should remain free from nests, leaves, debris and other obstructions.

Signs of venting problems may include corrosion, condensation, soot, unusual odors or appliance shutdowns. Stop using the affected equipment and contact a qualified professional if any unsafe condition is suspected.

Carbon monoxide alarms should be installed and maintained according to applicable codes and manufacturer instructions. An alarm does not replace correct appliance installation, vent sizing or periodic professional inspection.

Product Specifications

• Manufacturer: DuraVent
• Model: 4BV12
• Product type: Type B gas vent pipe
• Nominal inside diameter: 4 inches
• Pipe length: 12 inches
• Approximate outside dimension: 4.63 inches
• Inner-wall material: Aluminum
• Outer-wall material: Galvanized steel
• Outer-wall thickness: 28 gauge
• Approval: UL Listed
• Country of origin: USA

Product and Installation Resources

Browse additional Type B vent pipe and installation supplies from Xpress Supply. Review the official DuraVent Type B Gas Vent product information before installation.

Choose the 4BV12 when a properly designed system requires a UL-Listed 4-inch by 12-inch DuraVent Type B gas vent section. Confirm appliance compatibility, vent sizing and local requirements before ordering.