Grant Inner Flue Seal Fks61 Horizontal Flue Red

approx 70mm dia

Grant Inner Flue Seal – FKS61

Genuine Red Inner Flue Seal for Horizontal Balanced Flue Systems

The Grant FKS61 Inner Flue Seal is a genuine red rubber sealing ring used in the inner duct of horizontal balanced flue systems on Grant oil-fired boilers. Designed to provide a gas-tight, high-temperature-resistant seal, this component plays a crucial role in maintaining safe and efficient flue gas extraction by preventing combustion gas leakage from the flue duct.

Whether you're assembling a new flue or replacing a worn seal during servicing, the FKS61 helps ensure your boiler’s flue system operates safely and in compliance with manufacturer standards.

Key Features & Benefits

• Genuine Grant Part – FKS61
  OEM-approved replacement for Grant horizontal balanced flue kits—ensures proper fit and seal integrity.

• High-Temperature Red Flue Seal
  Manufactured from robust elastomer specifically formulated to withstand flue gas temperatures.

• Inner Duct Sealing Ring
  Designed for the inner pipe of Grant horizontal flue systems, creating a gas- and pressure-tight seal.

• Critical for Combustion Safety
  Prevents leaks that could compromise burner performance or boiler safety.

• Essential for Flue Maintenance & Reassembly
  Recommended for replacement when flue components are cleaned, removed, or repositioned.

• Quick and Easy Installation
  Pre-moulded ring designed for a snug fit within the flue collar—no special tools needed.

 Compatible Grant Boiler Models

The FKS61 Inner Flue Seal is suitable for a wide range of Grant oil boilers using a horizontal balanced flue system, including:

• Grant Vortex Utility (15–36kW models)

• Grant Vortex Pro Utility & Eco Utility models

• Grant Euroflame oil boilers

• Other Grant boilers fitted with a horizontal flue system using FKS-series seals

Not sure if this flue seal fits your model? Send us your boiler's serial number or flue kit part code—we’ll confirm compatibility for you.

When Should You Replace the Flue Seal?

Replace the FKS61 seal if:

• The existing seal is worn, cracked, brittle, or deformed

• You’re disassembling or repositioning the flue for servicing or installation

• There are signs of leakage such as staining, smell of combustion gases, or visible soot

• You're carrying out a boiler service or flue gas safety check

Failing to replace a worn seal can lead to unsafe operating conditions or reduced efficiency.

Technical Specifications

• Part Number: FKS61

• Manufacturer: Grant UK

• Component: Red inner flue duct seal

• Material: High-temperature-resistant rubber/elastomer

• Location: Fits within the inner duct of a horizontal balanced flue

• Application: Seals flue gases from escaping the flue collar

• Installation: Push-fit into the flue duct groove or boiler collar—check boiler manual for specifics