Heat Recovery Ducting

Heat recovery ducts Ø100–160 mm for efficient ventilation

Heat recovery ducts are a key part of every heat recovery ventilation system – whether it is a single-room heat recovery unit or a smaller centralised system. A correctly chosen heat recovery duct Ø100, 125, 150 or 160 mm directly affects quiet operation, heat efficiency and the reliability of the entire system. The AKVAVENT.SI range includes smooth ventilation ducts as well as insulated anti-vibration heat recovery ducts, which reduce noise, condensation and heat losses – ensuring long-term, stable heat recovery ventilation.

If you are planning a new home heat recovery system or upgrading an existing one, choose ducts whose diameter matches your heat recovery unit and the wall penetration. With the correct duct configuration you reduce pressure losses, improve the efficiency of ventilation systems and achieve quieter operation – with no compromises. You can order the ducts directly in the online store, together with the heat recovery unit and the accompanying components.

Types of heat recovery ducts – smooth and insulated MVHR ducts

The heat recovery ducts category brings together solutions for all the most common diameters: Ø100, Ø125, Ø150 and Ø160 mm. The range includes standard smooth ducts for heat recovery units, flexible ducts for installation in walls and ceilings, and insulated anti-vibration ducts for additional acoustic and thermal protection.

• Smooth heat recovery ducts Ø100 and Ø125 mm – ideal for small and medium-sized single-room heat recovery units in bathrooms, bedrooms and living areas. The smaller diameter allows easier wall penetration and discreet installation.
• Heat recovery ducts Ø150 and Ø160 mm – for more powerful units with higher airflow, longer runs or dual-channel heat recovery units. The larger diameter reduces the pressure drop and improves heat recovery efficiency over longer distances.
• Insulated heat recovery ducts – ducts with additional thermal insulation and anti-vibration protection that reduce fan noise and limit condensation in the colder parts of the building envelope. Recommended for penetrations through external walls and in cold, unheated spaces.

By choosing the right heat recovery duct you protect the unit, the facade and the interior finishes, and ensure that heat recovery ventilation works reliably and trouble-free for a long time.

How to choose the right heat recovery duct based on the unit and the space

When choosing a heat recovery duct, it is essential to match the duct diameter to the connection on the heat recovery unit and the length of the duct run. For a typical single-room heat recovery unit in a bathroom, a heat recovery duct Ø100 mm or a 100 mm heat recovery unit is most often used, while for larger living areas or dual-channel systems, Ø150 or Ø160 mm are the right choice.

• Short wall penetrations (up to a few dozen centimetres): standard smooth ventilation ducts that provide minimal air resistance are sufficient.
• Longer runs or penetrations through cold spaces: an insulated heat recovery duct is recommended, as it reduces heat losses and prevents condensation inside the duct.
• Reducing heat recovery unit noise and vibration: use an insulated anti-vibration duct Ø160 mm or a suitable diameter that acts as a sound silencer and relieves the unit.

If you are choosing a heat recovery ventilation system for the entire building and want to know how to choose the best ventilation system, selecting the right ducts is a key step. Combined with a suitable AIRA heat recovery unit, SIKU heat recovery unit or Venteurope heat recovery units, you get a complete and affordable home heat recovery system.

Technical data and recommended uses of heat recovery ducts

The table below presents the typical diameters and recommended uses for heat recovery ducts in residential buildings. The actual choice depends on the heat recovery unit model, the run length and the project requirements.

When designing heat recovery ventilation systems, we also recommend reviewing the air vents and valves category, as the right terminal will ensure balanced airflow and an attractive appearance of the space.

Connecting heat recovery ducts with other system components

The heat recovery duct is just one of the components that make up an efficient heat recovery ventilation system. For an optimal result, combine correctly sized ducts, a quality single-room heat recovery unit, a suitable exterior facade wall vent and appropriate filters. This way you reduce heat losses, improve heat recovery efficiency and ensure stable operation even in more demanding weather conditions.

If you are considering a subsidy, also check the Eko Sklad – heat recovery subsidy page, which describes the option of reimbursing part of the investment in a heat recovery ventilation system.