The Selkirk 3-Inch Diameter Type B Gas Vent Steel Adjustable Roof Flashing is engineered to deliver a weather-tight seal while maintaining safe and efficient venting performance for gas appliances. Designed to accommodate roof pitches from flat to 6/12, this adjustable roof flashing is constructed with a rugged galvanized steel outer pipe that ensures long-lasting durability in a wide range of residential, light-commercial, and industrial applications.
This roof flashing features die-formed ends that ensure uniform sizing for easy, secure connections, while internal spacing bends create a consistent insulating air space between the inner and outer pipe walls. These design features contribute to safe and efficient venting by maintaining proper air circulation and minimizing condensation buildup. A convenient lock tab feature allows for easy installation without the need for sheet metal screws, streamlining the setup process.
Ideal for use with approved gas-fired Category I natural draft appliances, including tank water heaters, warm air furnaces, and residential boilers, this Type B gas vent component meets stringent UL 441 safety standards and complies with NFPA 54 and NFPA 211 codes. Whether used in single or multi-story buildings, the Selkirk Adjustable Roof Flashing delivers the reliability and performance professionals trust for safe gas vent installations.
- Galvanized steel with die-formed ends ensures durability and easy, secure connections for long-lasting venting performance
- Designed to accommodate roof pitches from flat to 6/12, creating a weather-tight seal in various roof configurations
- Internal spacing bends maintain uniform air space between pipe walls for safe and effective venting of gas appliances
- Built-in lock tab allows for quick, tool-free setup—no need for sheet metal screws, reducing installation time
- UL 441 listed and meets NFPA 54 and 211 standards for use with approved gas appliances in residential and commercial settings
- Selkirk has led HVAC innovation with durable, efficient, UL-tested products engineered to exceed safety standards
- Size: 3-Inch
- Color: Silver
- Dimensions (L x W x H): 14.88 x 12.25 x 5.00 inches
- Weight: 1.25 pounds
Questions? We’ve Got Answers.
Helpful answers about product features, setup, and more
What material is the flashing, 103825 made of?
The flashing, 103825 is constructed from steel. This material choice supports everyday use while maintaining the structural integrity needed for the product’s intended applications.
How big is the flashing, 103825?
The flashing, 103825 measures 14.88 x 12.25 x 5.00 inches (length x width x height). Use these measurements to confirm the product fits your intended setup before ordering.
How do I clean and care for the flashing, 103825?
Wipe with a damp cloth and dry thoroughly to prevent rust. For powder-coated finishes, avoid abrasive cleaners that may scratch the coating. Regular light cleaning extends the lifespan of the flashing, 103825 and keeps it looking and performing well over time.
How easy is the flashing, 103825 to assemble?
The flashing, 103825 is designed for easy assembly. Setup is straightforward and typically completes quickly using basic instructions included with the product.
Who makes the flashing, 103825?
The flashing, 103825 is made by Selkirk. Selkirk produces this item as part of its lineup, and product details such as specifications, included accessories, and warranty terms are set by the brand.
How much does the flashing, 103825 weigh?
The flashing, 103825 weighs approximately 1.25 pounds. Use this figure when planning transport, handling, or placement of the item.


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