Rayburn Air Flap Emx R4677 Bft11504/001 R04M998575

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The Rayburn Air Flap (Part Number: R4677) is a critical air-regulation component used in the burner assemblies of specific Rayburn oil-fired cookers. It is frequently associated with the BFT11504/001 and R04M998575 reference numbers, which correspond to technical specifications for the flap's dimensions and movement profile within the burner housing.

This flap is part of the combustion air intake system. Its primary function is to precisely control the volume of air mixed with the fuel. Proper adjustment of this flap is essential for achieving a clean, efficient "blue flame" and preventing the buildup of soot or carbon within the heat exchanger.

Key Features and Specifications

Part Number: R4677.

Alternate References: BFT11504/001 / R04M998575.

Compatibility: Specifically designed for Rayburn 400 series (such as the 480K and 499K) and certain Nu-way burner configurations.

Material: Precision-stamped metal designed to resist warping under the radiant heat of the burner environment.

Function: Regulates the "Primary Air" flow to the combustion head.

Common Applications

Burner Calibration: Used by engineers during commissioning or servicing to set the CO2 levels and smoke numbers.

Combustion Stability: Ensures the air-to-fuel ratio remains constant, preventing burner "pulsing" or lockouts.

Replacement: Replaces flaps that have become seized, corroded, or physically damaged, which would otherwise prevent accurate air adjustment.

Installation and Adjustment

Seized Components: Because these operate in a dry, warm environment, the adjustment screws or the flap pivot can sometimes seize. It is recommended to use a high-temperature lubricant if the flap is sticking.

Technical Setting: The flap position must be set according to the manufacturer’s data plate for the specific nozzle and pump pressure being used. This should always be verified using a calibrated flue gas analyzer.

Cleanliness: During a service, ensure the flap and the surrounding intake are free from lint, pet hair, or dust, as these obstructions can significantly alter the air intake and cause "rich" combustion.

Essential Companion Products

Burner Motors: Simel 70W Drive Motor (R2514).

Fuel Delivery: Danfoss or Suntec Oil Pumps.

Maintenance: Flexible Oil Lines and Burner Nozzles.

Analysis: Flue Gas Analyzer (to verify air flap settings).

Specialist Support and Local Collection

Getting the air-to-fuel ratio correct is the most important part of an oil cooker service. We stock a wide array of Rayburn and Nu-way burner spares, from small mechanical flaps to full motor assemblies.

Visit our trade counter at 61 Fullers Road, E18 2QB for immediate collection. If you have your burner's serial number or the model of your Rayburn, our team can confirm that the R4677 is the correct revision for your appliance.