Introduction
This manual provides instructions for the Blulu Stainless Steel Direct Vent Pipe Kit, designed for tankless water heaters. The kit includes a vent pipe and an elbow, both constructed from 201 stainless steel for durability and corrosion resistance. The design facilitates efficient exhaust gas discharge and prevents water ingress.
Key Features:
- Complete Kit: Includes 1 vent pipe and 1 vent elbow for a comprehensive setup.
- Precise Dimensions: 3" OD elbow and 3" OD x 19.7" length pipe, designed for specific fit.
- Durable Material: Made from 201 stainless steel, offering high temperature and wear resistance.
- Efficient Exhaust: Streamlined surface and horizontal design ensure consistent airflow and prevent backflow.
- Versatile Application: Compatible with indoor gas water heaters and easily combined with other vent pipes.
Package Contents
Upon opening the package, verify that all components are present and undamaged:
- 1 x Stainless Steel Vent Pipe (19.7 inches length, 3" OD)
- 1 x Stainless Steel Vent Elbow (3" OD)

Image: Components of the Blulu Stainless Steel Direct Vent Pipe Kit. This image displays the straight vent pipe, the flexible elbow piece, and a separate mounting clip, illustrating the items included in the package.
Product Dimensions and Material
The vent pipe kit is designed with specific dimensions and material properties for optimal performance.

Image: Product Dimensions. This diagram illustrates the key measurements of the ventilating pipe, including a total length of 24 inches (61 cm), a pipe length of 19.7 inches (50 cm), and an outer diameter (OD) of 3.0 inches (7.62 cm). It also highlights features like corrosion resistance, high-temperature resistance, durable material, and deformation resistance.
Material Properties:
- Material: 201 Stainless Steel
- Corrosion Resistance: Designed to withstand corrosive environments.
- High-Temperature Resistance: Suitable for high-temperature exhaust applications.
- Durability: Robust construction for long-term use.
- Deformation Resistance: Maintains structural integrity under various conditions.

Image: Stainless Steel Material. This image provides a close-up view of the stainless steel vent pipe and elbow, emphasizing the high-quality 201 stainless steel material. Key attributes highlighted are high hardness, excellent corrosion resistance, and stable sealing performance.
Installation Instructions
Follow these steps for proper installation of the Blulu Stainless Steel Direct Vent Pipe Kit. Ensure all local building codes and safety regulations are met during installation. Professional installation is recommended if you are unsure about any steps.
- Confirm Exhaust Vent Size: Verify that the exhaust vent on your tankless water heater or ductwork has a 3-inch outer diameter (OD).
- Insert Elbow and Connector: Carefully insert the flexible elbow piece into the exhaust port. Ensure a snug fit.
- Connect Pipe: Attach the straight vent pipe to the other end of the elbow. The crimped end of the pipe is designed for straightforward insertion.
- Secure Connections: Use a screwdriver to tighten any clamps or fasteners provided with the kit to secure the connections between the elbow and the pipe, and the elbow to the water heater's exhaust vent.
- Complete Assembly: Ensure all connections are tight and secure to prevent exhaust gas leaks.

Image: How to Install. This four-step diagram illustrates the installation process: 1. Confirming the 3" OD exhaust vent, 2. Inserting the elbow and connector, 3. Tightening connections with a screwdriver, and 4. Completing the assembly.
Video: Blulu 1 Set 3" OD Elbow and 3" OD x 19.7" Length. This video demonstrates the assembly of the Blulu vent pipe and elbow, showing how the components fit together and are secured. It provides a visual guide to the connection process.
The kit is designed for horizontal venting systems, specifically for direct vent applications. It is not intended for vertical chimney vent systems.

Image: Horizontal vs. Vertical Venting. This image contrasts horizontal venting (applicable for direct vent systems, showing the Blulu kit installed) with vertical venting (for chimney vent systems). It clarifies that this product is for horizontal direct vent applications.
Operating Principles
Once properly installed, the Blulu Stainless Steel Direct Vent Pipe Kit facilitates the safe and efficient discharge of exhaust gases from your tankless water heater. The design ensures a steady flow of gases outwards, preventing backflow due to weather conditions like rain or wind.

Image: Steady Exhaust Gas Discharge. This diagram visually explains how the vent pipe ensures steady exhaust gas discharge, with arrows indicating the outward flow of CO2. It also depicts the pipe's effectiveness in preventing backflow during rain or windy conditions.
The closed top of the vent pipe, combined with a mesh cavity, is specifically designed to prevent rainwater or snow from entering the water heater system, maintaining operational integrity in various weather conditions.
Maintenance
Regular maintenance ensures the longevity and safe operation of your vent pipe kit.
- Visual Inspection: Periodically inspect the entire vent system for any signs of damage, corrosion, or loose connections.
- Cleanliness: Ensure the exterior of the vent pipe and the mesh cavity are free from debris, leaves, or other obstructions that could impede airflow.
- Seal Integrity: Check that all seals and connections remain tight to prevent exhaust gas leakage.
- Professional Check: It is advisable to have a qualified technician inspect your water heater and vent system annually.
Troubleshooting
If you encounter issues with your vent pipe kit, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Poor Exhaust Flow | Obstruction in the pipe (debris, bird's nest), loose connection, incorrect installation. | Inspect and clear any obstructions. Tighten all connections. Review installation steps. |
| Water Leakage | Improperly sealed connections, damaged pipe, incorrect rain cap installation. | Ensure all connections are tightly sealed. Check pipe for damage. Verify rain cap is correctly positioned. |
| Unusual Noises | Loose components, vibration, airflow issues. | Check all connections and mounting points for tightness. Ensure no parts are vibrating against each other. |
If problems persist after attempting these solutions, contact a qualified HVAC professional for assistance.
Specifications
| Attribute | Detail |
|---|---|
| Brand | Blulu |
| Model Number | Blulu-Vent Pipe-44 |
| Material | 201 Stainless Steel |
| Color | Silver |
| Item Weight | 1.4 pounds |
| Product Dimensions | 24 x 19.7 x 3 inches |
| Included Components | 1 x Vent pipe, 1 x Vent elbow |
| Compatibility | Tankless water heaters with 3" OD exhaust, direct vent systems |
Warranty and Support
Specific warranty information for the Blulu Stainless Steel Direct Vent Pipe Kit is not provided in this manual. For details regarding warranty coverage, returns, or technical support, please refer to the product packaging or contact Blulu customer service directly through their official website or the retailer where the product was purchased.
For additional information or to explore other Blulu products, visit the Blulu Store on Amazon.





