Ducting Solutions for Heat Recovery Ventilation Systems

A heat recovery ventilation system is only as good as the ducting used.

Warmth supply the most comprehensive range of quality ventilation and duct solutions and we can design a system to suit any type of property.

There are two types of ducting solutions:  The Radial System or the Branched System


Radial System with the use of semi rigid ducting


Radial ducting is the latest innovation on ventiliation systems and can provide a quieter and more efficient ventilation system compared to rigid ductwork.

Radial Ducting is a system of smooth bore pipes which are crushproof, semi flexible with zero air loss. The pipes have an anti-static and antibacterial lining which individually connects each room to a manifold and are available in both circular (75mm or 90mm) and oval (51mmx114mm) fittings. Radical ducting is suitable for any type of property; including timber framed houses, passive house approval homes and can be used in areas with limited access.


  • Zero air leakage ductwork (pipe ends are mechanically fitted with rubber seals)
  • Low air resistance
  • 50 percent faster installation rate than traditional branch systems (PVC/metal)
  • No crosstalk between rooms (Quieter)
  • Smaller pipework than tradtional branch systems
  • No sealants required
  • Hygenic smooth inner surface
  • Easy to install
  • Easy to clean
  • supplied in 50m coils
  • crushproof up to 16 Kn/m
  • SAP appendix Q recognised
  • Up to 85% less connections than traditional Rigid Ductwork
  • Suitable for DIY installation
  • Installation recommended below loft insulation to improve heat retention compared to older systems

Do not confuse this ducting with flexible or semi rigid aluminium ducting


Branched System with the use of rigid PVC or galvanised metal


Rigid/branched ducting is commonly used and is a cost effective ductwork solution on ventiliation systems.

Is a system of round or flat PVC or EPE rigid ductwork which are typically 150mm or 125mm which branch out with T-pieces into various rooms. PVC Rigid ductwork has been used for over 50 years in domestic installations.


  • Available from 100mm to 300mm diameters
  • Cost efficient
  • Excellent air flow rates
  • PVC range suitable for DIY installations
  • Suitable for exposed locations
  • SAP appendix Q listed
  • Can be commercially cleaned
  • Galvamised metal suitable for traditional systems
  • Installation above the loft insulation and insulated seperately is recommended
  • Galvanised metal has high crushability
  • PVC rectangular range available for areas of limited height.