4BVVTH – DuraVent 4-Inch B-Vent High Wind Cap

4BVVTH DuraVent B-Vent High Wind Cap

4BVVTH by DuraVent is a 4-inch high wind termination cap designed for compatible Type B gas vent systems. It provides the exterior termination point for a properly sized and installed gas-appliance vent.

The cap is designed for locations where wind conditions may affect a standard vent termination. Its engineered shape helps protect the opening and support the proper discharge of combustion gases when installed according to DuraVent requirements.

4BVVTH High Wind Design

The 4BVVTH is specifically identified as a high wind cap. It helps reduce the effects of challenging wind conditions at the top of a compatible Type B vent system.

Wind moving across a roof can create changing pressure around the termination. Selecting the correct listed cap and positioning it according to the manufacturer’s instructions helps support dependable vent operation.

A high wind cap cannot correct an incorrectly sized, obstructed or poorly installed vent. The complete vent system and connected appliance must be evaluated as a single installation.

Compatible 4-Inch Type B Vent Systems

The 4BVVTH has a nominal inside diameter of 4 inches and is intended for compatible 4-inch DuraVent Type B gas vent components. It should not be selected solely because another pipe or fitting has the same nominal diameter.

Different venting systems may use different locking mechanisms, exterior dimensions and safety listings. Combining incompatible components may prevent a secure connection and could affect the performance of the complete vent.

Confirm compatibility using current DuraVent documentation. The connected appliance must also be approved for use with a Type B gas vent system.

Durable Metal Construction

The 4BVVTH uses aluminum and galvanized steel components. This combination provides a lightweight but durable termination suitable for its intended exterior application.

The cap measures approximately 8.5 inches long, 8.5 inches wide and 8.5 inches high. Its approximate weight is 0.8 pounds, making it manageable during preparation and installation.

The product is constructed with 28-gauge metal components and is manufactured in the United States. Its metallic finish should be inspected periodically for damage, corrosion or accumulated debris.

UL-Certified Component

The 4BVVTH is identified as a UL-certified component. This certification applies when the cap is used for its intended purpose within a compatible DuraVent Type B gas vent system.

Installation must follow current manufacturer instructions. Cutting, drilling, crushing or making unauthorized modifications may damage the cap, interfere with airflow or affect its certification.

Use only approved connection methods and compatible DuraVent products. Do not substitute general-purpose roofing caps or ventilation accessories for a listed gas-vent termination.

Gas Vent Termination Function

The 4BVVTH terminates the Type B vent above the roof and allows combustion gases to discharge outdoors. Its design also helps limit the direct entry of precipitation and debris into the vent opening.

Correct termination height and placement are essential. Nearby walls, roof surfaces, trees and other structures can influence airflow around the cap. Required clearances depend on the roof pitch, surrounding construction and applicable codes.

The cap should never be covered, screened or modified with materials that could restrict the vent opening. Any obstruction can interfere with the removal of combustion gases.

Professional Installation Required

The 4BVVTH should be installed by a qualified professional familiar with gas-fired appliances and Type B venting systems. The installer must verify vent size, termination height, roof clearances, supports and compatibility with every connected component.

The complete vent system must remain properly aligned and supported below the cap. The termination should not carry unsupported vent weight or be used to correct an unstable pipe assembly.

The installer should also confirm that the roof flashing and storm collar are properly integrated with the vent. These components help reduce water intrusion around the roof penetration.

Appliance and Vent Compatibility

This cap is only suitable for compatible appliances approved for Type B gas venting. It must not be used for wood-burning appliances, solid-fuel equipment or vent systems requiring another chimney classification.

High-efficiency condensing furnaces and water heaters often require specialized vent materials instead of Type B pipe. Always review the appliance rating plate and installation instructions before selecting vent components.

A qualified professional should verify the complete vent-sizing calculation. Appliance input, vent height, lateral distance, fittings and common-vent arrangements can affect the required system size.

Inspection and Maintenance

Inspect the 4BVVTH periodically and after severe weather. Check for loose connections, impact damage, corrosion, nests, leaves and other materials that could restrict the opening.

The cap should remain securely connected and correctly positioned. If it becomes damaged or detached, stop using the affected equipment until the vent is inspected and repaired by a qualified professional.

Warning signs of a venting problem may include soot, corrosion, condensation, unusual odors or appliance shutdowns. Carbon monoxide alarms should be installed and maintained according to applicable requirements.

Product Specifications

• Manufacturer: DuraVent
• Model: 4BVVTH
• Product type: Type B high wind vent cap
• Nominal inside diameter: 4 inches
• Approximate length: 8.5 inches
• Approximate width: 8.5 inches
• Approximate height: 8.5 inches
• Approximate weight: 0.8 pounds
• Composition: Aluminum and galvanized steel
• Metal thickness: 28 gauge
• Approval: UL certified
• Country of origin: USA

Product and Installation Resources

Browse more Type B venting and installation supplies from Xpress Supply. Review the official DuraVent Type B Gas Vent information before installation.

Choose the 4BVVTH when a compatible 4-inch DuraVent Type B gas vent system requires a high wind termination cap. Confirm the appliance, vent diameter, termination location and local requirements before ordering.