A B-vent sidewall termination kit must match the appliance’s venting system and manufacturer instructions; the products below are not all B-vent kits. The 46DVA-HC is a direct-vent termination for gas fireplaces or stoves, while the other options are listed for water heaters, furnaces, or boilers. Use the comparison to identify a potentially relevant option, then verify the exact vent type, diameter, and approved installation method before buying. The SP20285 is best suited to specified 2-inch PVC or ABS applications, and the SP20286 is a 3-inch option described for Rheem replacement use.
| Product | Listed application | Key fit information |
|---|---|---|
| 46DVA-HC termination cap | Direct-vent gas stove or fireplace | 4-inch by 6-5/8-inch direct-vent system |
| SP20285 horizontal kit | Tankless water heater or high-efficiency furnace | 2-inch PVC or ABS; 4-inch center-to-center |
| 22152 concentric kit | Water heater | 2-inch; horizontal or vertical venting |
| 3-inch sidewall kit | Ultra gas-fired boiler | 3-inch; confirm appliance-specific fit |
| SP20286 termination kit | Rheem replacement application | 3-inch PVC or ABS piping |
46DVA-HC Direct-Vent Termination Cap
This cap is listed for direct-vent gas fireplaces and stoves using a 4-inch by 6-5/8-inch vent system. Its description specifies a dual-wall construction with an aluminum inner wall and a galvalume steel outer wall. It also describes twist-lock construction and laser-welded seams.
Best for: Buyers replacing or completing a compatible direct-vent fireplace or stove system. It is selected because its use and vent dimensions are stated clearly. The product description also says it is intended to help protect against weather exposure and to support intake and exhaust through the termination.
Important limitation: This is a direct-vent termination, not a general B-vent cap. Do not choose it for a B-vent appliance unless the appliance manufacturer explicitly specifies this exact component and vent system. Confirm the model’s required termination before purchase.
SP20285 2-Inch Horizontal Termination Kit
The SP20285 is described for tankless gas water heaters, high-efficiency furnaces, and other high-efficiency fossil-fuel appliances. The product information specifies 2-inch PVC and ABS pipe and a 4-inch center-to-center measurement. It is described for horizontal through-wall or vertical through-roof installations, and the listing says screws are included.
Best for: A buyer whose appliance instructions call for this type of 2-inch PVC or ABS termination. The low-profile design is intended to conceal intake and exhaust pipework, which may suit installations where a less prominent exterior appearance is preferred.
Important limitation: The listing specifically restricts this kit to 2-inch PVC or ABS pipes. It is not identified as a B-vent termination. Check the appliance manual for approved vent material, arrangement, and installation orientation; do not assume that the stated vertical use is approved for every appliance.
22152 2-Inch PVC Concentric Vent Kit
This 2-inch concentric termination kit is described for a water heater. Its listed benefit is that a concentric arrangement allows intake and exhaust to use one wall or roof opening rather than requiring two separate openings. The listing says it supports horizontal or vertical venting and is designed for easy assembly.
Best for: Water-heater installations whose manufacturer approves a 2-inch concentric vent arrangement. It may be a better fit than a separate-pipe termination when the specified system is designed to use a single opening.
Important limitation: The available product details do not identify specific water-heater models, vent material requirements, or detailed dimensions beyond the 2-inch size. Verify those details in the appliance documentation before ordering. A concentric kit is not automatically interchangeable with a B-vent termination.
3-Inch Sidewall Kit for Ultra Gas Boilers
This product is named as a 3-inch sidewall vent termination kit for Ultra gas-fired boilers. The supplied listing does not provide additional features, materials, included hardware, or compatibility details beyond that stated application and size.
Best for: Buyers who have an Ultra gas-fired boiler and whose appliance documentation calls for a 3-inch sidewall termination of this type. It is included because its named boiler application is more specific than a general-purpose vent cap.
Important limitation: The product information is limited. Confirm the boiler model, vent system, pipe material, and exact termination requirements with the manufacturer or installation documentation before purchase. The name alone does not establish that it is suitable for B-vent or for other boiler brands.
SP20286 3-Inch Vent Termination Kit
The SP20286 is described as a 3-inch termination kit for 3-inch PVC or ABS piping and as a replacement part for a Rheem SP20286 application. The listing says its design is intended to support airflow and exhaust in a 3-inch vent system, and describes the construction as durable.
Best for: Buyers replacing a termination on an appliance that specifically requires the SP20286 part or an approved equivalent. Its stated 3-inch pipe size makes it easier to screen for a matching system than products without a listed diameter.
Important limitation: The description does not establish compatibility with every Rheem appliance or with B-vent systems. Confirm the exact part number, vent material, and model requirements. Avoid choosing it based only on the 3-inch diameter.
Buying Guide: How to Choose a Sidewall Termination Kit
Is the appliance actually designed for sidewall venting?
Start with the appliance installation manual, not the shape of the existing exterior cap. Some appliances are designed for horizontal sidewall termination, while others require a different route or termination configuration. The listed products include direct-vent, concentric, and appliance-specific options, so the phrase “sidewall termination kit” does not make them interchangeable.
Check the appliance’s approved venting method and termination location requirements. If the manual does not clearly authorize a sidewall installation, consult the manufacturer or a qualified professional before selecting parts.
Is the vent type B-vent, direct vent, or PVC/ABS?
These terms describe different venting systems. The 46DVA-HC is specifically described as a direct-vent cap. The SP20285 and SP20286 listings specify PVC or ABS piping. The concentric kit is described for a water heater, but the supplied details do not establish its full material or model compatibility. None of these descriptions identifies a general B-vent termination kit.
For a true B-vent system, select a termination component approved for that exact B-vent system and appliance. Do not substitute a direct-vent cap or plastic-pipe termination based on a similar diameter or appearance.
How should you compare size and connection details?
Match all stated dimensions, not just the nominal pipe diameter. For example, the 46DVA-HC is listed as 4 inches by 6-5/8 inches, while the SP20285 is specified for 2-inch PVC or ABS and a 4-inch center-to-center measurement. The SP20286 is listed for 3-inch PVC or ABS. These specifications describe different products and should not be treated as equivalent.
- Confirm the appliance model and approved vent system.
- Match pipe size, material, and connection style.
- Check whether the required layout is horizontal, vertical, concentric, or separate-pipe.
- Verify the complete part number and any required system components.
What else should you verify before installation?
Review the appliance instructions for required clearances, termination placement, and installation orientation. Local building and mechanical requirements may also apply. Product listings may not include every specification needed to determine whether a kit is suitable for a particular installation.
When replacing an existing termination, identify the appliance and vent-system manufacturer before removing parts. A replacement that fits the opening may still be the wrong component for the appliance. If the approved part cannot be confirmed, get guidance from the manufacturer or a qualified installer.
Frequently Asked Questions
Are the products in this list all B-vent sidewall kits?
No. The supplied descriptions identify direct-vent, PVC/ABS, concentric, water-heater, furnace, and boiler applications. They do not establish any of these products as a universal B-vent termination kit.
Can I use a direct-vent termination cap on a B-vent system?
Do not assume that you can. The 46DVA-HC is listed for a 4-inch by 6-5/8-inch direct-vent system. Use it only when the appliance manufacturer specifies that component for the system.
How do I choose between the 2-inch and 3-inch kits?
Use the size and material specified in the appliance manual. The SP20285 is listed for 2-inch PVC or ABS pipe, while the SP20286 is listed for 3-inch PVC or ABS. Diameter alone does not confirm compatibility.
Does a concentric kit require only one opening?
The 22152 listing says its concentric design requires one opening rather than two for intake and exhaust. Confirm that the appliance manufacturer approves this kit and configuration before installation.
What should I do if my appliance model is not listed?
Check the manufacturer’s venting documentation or contact the manufacturer with the model and existing vent-system information. Do not select a termination based only on a product title or a visually similar part.