Adjustable | External Twin Wall Flue System | Double Storey | 6.5m

This complete twin wall flue system is designed for two-storey external installations where both height and flexibility are required. With 4 bends for versatile routing and an adjustable pipe for fine-tuning during fitting, it provides a safe, durable, and fully certified solution for modern stove installations.

Unlike fixed systems, this adjustable kit allows installers to customise the final height on-site and provides easier long-term access for stove maintenance and sweeping.

What’s Included in the Kit

1. TWPro MB – Flat Adaptor Ø125 (x1)

• Connects the stove’s single wall outlet to the twin wall system

• 304 stainless steel outer (black coated) / 316L stainless inner

• 25 mm rock wool insulation

• CE marked & HETAS approved

• 50 mm clearance to combustibles

2. TWPro MB – Rain Cap Ø125 (x1)

• Terminal cap prevents rain ingress while allowing safe flue discharge

• Cone-top stainless steel design, corrosion resistant

3. TWPro MB – 45° Bend Ø125 (x3)

• Navigate around eaves, soffits, or walls

• Fully insulated and supplied with locking bands

• CE certified

4. TWPro MB – 135° Tee Ø125 (x1)

• Base connection point with sweeping access

• Includes locking band

• HETAS approved & CE marked

5. TWPro MB – Tee Cap Ø125 (x1)

• Closes the base of the tee

• Includes threaded outlet for condensate drainage

6. TWPro MB – Adjustable Base Support Ø125 (x1)

• Provides load-bearing support at the system’s base

• Adjustable height for uneven ground

• Black finish, supplied with locking band

7. TWPro MB – Pipe 1000 mm Ø125 (x5)

• Full-length insulated twin wall pipes (~965 mm effective each)

• 316L stainless inner, 304 stainless outer (black)

• 25 mm injected rock wool insulation (190 kg/m³ density)

• EN1856-1 certified, G50 rated

8. TWPro MB – Pipe 500 mm Ø125 (x1)

• Shorter pipe for fine height adjustment

• Same insulation and construction as full-length sections

9. TWPro MB – Adjustable Pipe 350–500 mm Ø125 (x1)

• Telescopic section allows height adjustment during fitting

• Includes insulation wrap and locking band

• Provides flexibility for installation and future maintenance access

10. TWPro MB – Wall Support 50–80 mm Ø125 (x2)

• Secures flue to external wall

• Adjustable spacing (50–80 mm)

• Powder-coated black, load rated for multi-storey use

Certified & Compliant

• EN1856-1 T600 N1 W V2 L50040 G50

• CE Marked & HETAS Approved

• Minimum 50 mm clearance to combustibles

• 25-Year Manufacturer Warranty (2 years on painted finish)

Ideal For

• Two-storey properties requiring external vertical flues

• Installations where routing flexibility is needed (4 bends included)

• Stoves requiring future sweeping and easy maintenance access

• Wood-burning or multi-fuel appliances with Ø125 mm outlets

Benefits for Homeowners

• Flexible system for complex or restricted installations

• Adjustable components reduce fitting challenges on-site

• Professional-grade stainless steel and insulation for durability

• Certified safe and compliant with UK regulations

• Long-term warranty for peace of mind