Grant Flue Seal Fks54 Red Combi

approx 110mm dia

Genuine Red Flue Seal for Grant Combi Boilers | Secure & Heat-Resistant Seal for Balanced Flue Systems

Keep your boiler safe, efficient, and fully sealed with the Grant Red Flue Seal – FKS54, a genuine replacement part for use in Grant Combi boiler flue systems. Specifically designed to fit the inner duct of balanced flue kits, this red high-temperature-resistant seal ensures that flue gases are properly contained while maintaining system pressure and combustion efficiency.

Essential during flue maintenance or installation, the FKS54 offers a precise, secure fit for various Grant Combi boilers and should always be replaced if the original seal is worn, damaged, or removed during servicing.

 Key Features & Benefits

• Genuine Grant Part – FKS54
  Direct replacement flue seal made to Grant’s specifications for assured safety and performance.

• High-Temperature Resistant
  Manufactured from heat- and pressure-resistant red elastomer, ideal for flue system environments.

• Designed for Balanced Flue Systems
  Specifically seals the inner flue duct on Grant Combi boilers using horizontal or vertical flue kits.

• Maintains Boiler Efficiency & Safety
  Prevents flue gas leakage and protects against pressure loss within the combustion system.

• Essential for Servicing or Reassembly
  Should be replaced whenever the flue system is disassembled or inspected.

• Easy Installation
  Push-fit design ensures a quick and secure fit for professional and DIY installers alike.

 Compatible Grant Boiler Models

The FKS54 Red Flue Seal is compatible with a variety of Grant Vortex Combi boilers, including:

• Grant Vortex Pro Combi 21kW

• Grant Vortex Pro Combi 26kW

• Grant Vortex Pro Combi 36kW

• Other Grant Combi boilers using high-level or vertical balanced flue kits (post-2010)

Not sure if this part fits your flue system? Contact our knowledgeable support team with your boiler model or serial number, and we’ll confirm compatibility.

 When to Replace the Flue Seal

You should replace the flue seal if:

• The seal is cracked, worn, or perished

• You're conducting a boiler flue reassembly or annual inspection

• The flue system has been exposed to water ingress, high heat, or chemical contamination

• You're fitting a new flue system or replacing key flue components

A compromised flue seal can lead to unsafe operation, system inefficiency, and potential boiler faults—timely replacement is critical.

 Technical Specifications

• Part Number: FKS54

• Manufacturer: Grant UK

• Seal Colour: Red (identifies high-temperature flue application)

• Material: Heat- and gas-resistant elastomer

• Application: Inner flue duct seal for Grant Combi boiler balanced flue kits

• Temperature Rating: Suitable for high-temperature operation in condensing oil boiler systems

• Installation Type: Push-fit into inner flue duct channel