Flue Concentric Reducer DE DIETRICH 60/100→80/125 model 84887707A

The Flue Concentric Reducer DE DIETRICH 60/100→80/125 model 84887707A is a concentric transition fitting designed to connect coaxial flue ducts of different diameters. It enables a sealed join between a 60/100 mm duct and an 80/125 mm duct in systems where a concentric flue arrangement is required, maintaining separate channels for combustion gas exhaust and air intake within a single assembly. The reducer is intended for use with compatible boilers and venting components that accept concentric connections.

Advantages

The reducer provides a compact, single-piece solution for adapting duct diameters while preserving the concentric layout of exhaust and intake passages. Its design ensures a continuous central exhaust path and surrounding air intake channel, reducing the risk of leaks when properly installed. The fitting simplifies installation where a change of diameter is needed without converting to separate ducts, and it supports reliable gas-tight performance in compliant systems.

Suitable for

• Connecting a 60/100 mm concentric flue pipe to an 80/125 mm concentric flue pipe
• Use in boiler installations that require concentric venting transitions
• Situations where a compact diameter adaptation is needed within an existing concentric flue run

When it may not be suitable

This reducer is not appropriate for non-concentric or single-wall flue systems that require separate intake and exhaust pipes rather than combined concentric assemblies. It should not be used with appliances or installations that specify different diameter transitions, non-compatible connection standards, or materials for which this fitting is not rated. Always verify compatibility with the boiler manufacturer’s venting requirements and local building codes.

Key specifications

• Type: Concentric flue reducer / transition fitting
• Input/Output diameters: transition from 60/100 mm to 80/125 mm
• Function: Maintains separate concentric channels for exhaust and intake within one fitting
• Application: Indoor or enclosed boiler flue systems that require concentric connections (subject to appliance compatibility)

How to use

Install the reducer between the smaller and larger concentric flue pipes, ensuring that each concentric pipe is fully seated and secured according to the flue system’s connection method. Follow the boiler manufacturer’s instructions and the flue component assembly guidelines to achieve a gas-tight joint. Check alignment, secure locking features or clamps if applicable, and perform a pressure/leak check or visual inspection after installation. Ensure adequate support and clearance as required by regulations.

What to consider before purchase

• Confirm that your boiler and flue components use concentric ducts and that a 60/100→80/125 transition is required
• Verify material compatibility and temperature/pressure ratings with your appliance documentation
• Ensure local building codes and the boiler manufacturer permit the use of this reducer in your installation

Usage recommendations

Use only with compatible concentric flue systems and follow manufacturer installation instructions. If uncertain about compatibility or local regulations, consult a qualified heating engineer or installer before fitting the reducer.