4-Inch Firestop Spacer for Selkirk Model HT Chimney

This 4-inch firestop spacer is a Selkirk Model HT / Ultra-Temp chimney component used to provide additional protection where the chimney passes through compatible combustible construction. Selkirk identifies the 4-inch firestop spacer as HT4FS.

The firestop spacer can also be used to finish certain openings where the chimney passes through non-combustible material. The exact application depends on the chimney-system installation instructions and the type of penetration.

4-Inch Firestop Spacer Specifications

• Chimney size: 4 inches
• Manufacturer: Selkirk
• Selkirk product code: HT4FS
• Center opening: approximately 6-1/8 inches
• Plate dimension: approximately 12 inches
• System: Selkirk 4-inch Model HT / Ultra-Temp chimney
• Purpose: Additional protection at compatible chimney penetrations

Firestop Spacer vs. Other Penetration Components

A chimney system can use different firestop, shielding, support, and thimble components depending on whether it passes through a floor, ceiling, attic, wall, or roof. The firestop spacer is not automatically interchangeable with a wall thimble, ceiling support, attic insulation shield, or firestop radiation shield.

For other common penetration components, see:

• 4-Inch Firestop Radiation Shield
• 4-Inch Attic Insulation Shield
• 4-Inch Black Ceiling Support
• 4-Inch Wall Radiation Shield

Use With the Compatible Insulated Chimney

This spacer is designed around the approximately 6-inch outside diameter of the Selkirk 4-inch insulated chimney system. Pair it with compatible chimney lengths such as our 36-inch, 24-inch, 18-inch, and 12-inch chimney sections where the installation calls for them.

Read our 4-Inch Stove Pipe Guide or browse all 4-inch chimney and installation accessories.

Installation Notes

Do not use this firestop spacer as a universal solution for every wall or ceiling penetration. Follow the current Selkirk installation instructions to determine which listed support, firestop, shield, or thimble component is required for your specific structure and chimney route.

Maintain all required airspace to combustible materials and follow the appliance manual, chimney instructions, and applicable building and fire codes.

For current manufacturer information, see the Selkirk Ultra-Temp chimney resources.