Grant Red Flue Seal High Level Vertical B/F To 26K Fks53

approx 85mm dia

Grant Red Flue Seal – High Level Vertical B/F to 26kW (FKS53)

Genuine Replacement Flue Seal for Grant Oil Boilers with Balanced Flue Systems

Maintain a safe, secure, and efficient flue system with the Grant Red Flue Seal – FKS53, specifically designed for use in high-level vertical balanced flue (B/F) applications on Grant oil-fired boilers up to 26kW. This genuine Grant part is a crucial sealing component within the flue assembly, helping to prevent flue gas leakage and ensure proper boiler performance.

Whether you’re servicing a flue system or replacing worn seals, the FKS53 offers peace of mind through reliable performance, heat resistance, and a precise fit. Trusted by heating professionals and suitable for competent DIYers.

Key Features & Benefits

• Genuine Grant Part – FKS53
  Manufactured to original Grant specifications for compatibility, safety, and durability.

• High Temperature-Resistant Red Seal
  Designed to withstand the heat and pressure within vertical balanced flue systems.

• Critical for Safe Operation
  Prevents escape of combustion gases and maintains pressure integrity within the flue assembly.

• Suitable for Vertical High-Level Installations
  Specifically intended for vertical B/F flue configurations up to 26kW output.

• Quick, Secure Fitment
  Ensures a snug seal within the flue system, reducing installation time and eliminating air ingress.

 Compatible Grant Boiler Models

The FKS53 Red Flue Seal is suitable for use with the following Grant oil boilers when installed with high-level vertical balanced flue kits:

• Grant Vortex 15-21kW (Internal & External)

• Grant Vortex Eco 15-21kW

• Grant Vortex Pro 15-21kW

• Any Grant oil boiler models using vertical high-level balanced flue kits rated up to 26kW

Always consult your boiler and flue kit manuals to confirm correct part usage. For help, contact our expert team with your boiler model or serial number.

When Should You Replace the Flue Seal?

Replace the FKS53 flue seal if:

• The existing seal is cracked, worn, or perished

• You detect flue gas smells or signs of leakage near the flue system

• During a routine boiler flue service or part of a flue kit replacement

• As a preventive measure during flue reassembly or inspection

A compromised flue seal can lead to dangerous gas leaks or reduced boiler efficiency—timely replacement is essential for safety and compliance.

Technical Specifications

• Part Number: FKS53

• Manufacturer: Grant UK

• Seal Type: High-temperature red silicone/rubber flue seal

• Application: High-level vertical balanced flue systems

• Flue Compatibility: Grant vertical B/F kits up to 26kW

• Material: Heat- and pressure-resistant elastomeric compound

• Colour: Red (identifies high-temp flue applications)