4BV36 – DuraVent 4″ × 36″ Type B Gas Vent Pipe

4BV36 DuraVent Type B Gas Vent Pipe

4BV36 by DuraVent is a 4-inch by 36-inch Type B gas vent pipe designed for compatible listed gas-fired appliances. This three-foot straight section can provide additional length in a properly sized and approved DuraVent Type B venting system.

Its factory-engineered double-wall construction creates a dedicated passage for removing combustion gases. The pipe must only be used with compatible components and installed according to the appliance instructions, DuraVent requirements and applicable local codes.

4BV36 Double-Wall Construction

The 4BV36 uses the double-wall construction associated with DuraVent Type B gas vent systems. Its aluminum inner liner carries combustion gases, while the galvanized steel outer wall supplies protection and structural support.

This construction helps the vent heat rapidly during appliance operation. Maintaining suitable vent temperatures can support natural draft and help reduce condensation inside a properly configured gas vent system.

The pipe has a nominal internal diameter of 4 inches and a total length of 36 inches. Its longer size can reduce the number of individual pipe sections needed across a straight vent run.

Type B Gas Vent Application

The 4BV36 is specifically designed for compatible Type B gas vent applications. It should only be connected to appliances and vent systems approved for this type of product.

Do not use this pipe for wood-burning appliances, solid-fuel equipment or systems requiring another chimney classification. High-efficiency condensing furnaces and water heaters may require specialized plastic, polypropylene or stainless-steel venting instead of Type B pipe.

Review the appliance rating plate and installation manual before selecting vent components. The appliance documentation should identify the approved vent type, required diameter, clearances and termination configuration.

Four-Inch Diameter and 36-Inch Length

The 4BV36 has a nominal internal diameter of 4 inches and a pipe length of 36 inches. It is intended for compatible venting systems designed to use 4-inch DuraVent Type B components.

Vent diameter should not be selected only from the appliance outlet size. Appliance input capacity, vent height, lateral distance, number of fittings and common-vent arrangements may affect the required diameter.

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

Long Straight Vent Section

The 36-inch length of the 4BV36 makes it useful for installations requiring a longer straight section. Using one longer pipe may reduce the number of connections compared with assembling several shorter pieces.

The pipe should not be cut, shortened, drilled or otherwise modified. Type B gas vent products are manufactured as parts of a listed system, and unauthorized alterations may damage the double-wall construction or compromise proper operation.

Before ordering, confirm that the 36-inch section fits the available space while maintaining required clearances, supports and access for inspection.

Compatible DuraVent Components

The 4BV36 should be connected only to compatible 4-inch DuraVent Type B vent products. A complete system may include elbows, supports, firestops, roof flashing, additional pipe sections and an approved termination cap.

Do not mix components from unrelated vent systems simply because they have the same nominal diameter. Different product lines may use different locking mechanisms, exterior measurements and clearance requirements.

Every connection should be fully engaged and secured according to current DuraVent instructions. Inspect the completed route to ensure that all pipe sections remain aligned and adequately supported.

Professional Installation Required

The 4BV36 should be installed by a qualified professional experienced with gas-fired appliances and Type B venting. The installer must verify sizing, clearances, supports, offsets, firestops, roof penetrations and termination requirements.

The complete vent system must maintain the manufacturer-specified clearance from combustible materials. Insulation, wood framing, wiring and stored objects must not enter or obstruct this required clearance.

The vent route should rise according to the manufacturer’s instructions and avoid unnecessary horizontal sections or turns. Proper supports help prevent movement, separation and excessive stress on the appliance connection.

Inspection and Maintenance

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

Potential warning signs include condensation, corrosion, soot, unusual odors or repeated appliance shutdowns. Stop using the affected equipment and contact a qualified professional if an unsafe condition is suspected.

Install and maintain carbon monoxide alarms according to applicable codes and the alarm manufacturer’s instructions. Carbon monoxide alarms provide important protection but do not replace correct vent installation and professional inspection.

Product Features

• Manufacturer: DuraVent
• Model: 4BV36
• Product type: Type B gas vent pipe
• Nominal inside diameter: 4 inches
• Pipe length: 36 inches
• Durable double-wall construction
• Aluminum inner vent wall
• Galvanized steel exterior
• Compatible with approved 4-inch DuraVent Type B components
• Professional installation required

Product and Installation Resources

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

Choose the 4BV36 when a properly designed venting system requires a 4-inch by 36-inch DuraVent Type B gas vent section. Confirm appliance compatibility, vent sizing, available clearances and local requirements before ordering.