Exhaust flue pipe Almeva FLEX DN80 (DWZ) – model PPRSF8, flexible chimney exhaust pipe

Almeva FLEX DN80 (DWZ) PPRSF8 is a flexible exhaust flue pipe designed to connect heating appliances to chimney systems. With a nominal diameter of DN80, the product provides a protected conduit for the safe passage of combustion gases and condensate where a fixed rigid connection is impractical. The flexible construction allows for easy routing through confined or offset spaces and supports both retrofit and new-build installations in residential and light-commercial settings.

Advantages

The flexible stainless construction accommodates bends and offsets without the need for multiple rigid fittings, reducing installation time and complexity. Its smooth internal surface helps maintain draft and limits soot buildup, while the DN80 diameter is suitable for small boilers, stoves and similar heating appliances. The lightweight design simplifies handling and positioning during installation, and the product is compatible with standard chimney termination and sealing methods when used according to installation regulations.

Suitable for

• Connecting gas, oil or solid-fuel appliances with small flue outlets to existing chimneys
• Retrofit installations where rigid pipe routing is impossible or would require additional fittings
• Temporary or permanent flexible transitions between appliance flue collar and chimney system
• Installations requiring tight bends or alignment adjustments within chimney cavities

Key specifications

• Nominal internal diameter: DN80
• Flexible corrugated construction for ease of routing
• Suitable for appliance flue connections and chimney transition
• Designed for combustion gas and condensate conveyance in domestic installations
• Lightweight and easy to handle for one-person installation tasks

How to use

Measure the required length and route taking into account bends and clearances specified by appliance and chimney manufacturers. Cut the flexible pipe to the required length using appropriate tools, ensuring a clean edge. Fit the pipe to the appliance flue collar and to the chimney connection, using approved clamps, connectors or sealants as required by local building and flue regulations. Ensure all joints are secure and that the installation maintains correct fall and drainage for condensate where applicable. Verify the complete system for leaks and proper draft before placing the appliance into normal operation.

Usage recommendations

Follow appliance manufacturer instructions and local building codes for flue material compatibility, minimum clearances and required inspections. Regularly inspect the flexible flue section for signs of damage, corrosion or soot accumulation and arrange professional servicing when necessary. Avoid exceeding appliance-specific temperature or pressure limits and do not use the flexible flue as a structural support for other components.