Balanced ventilation coordinates mechanical supply and extraction. The arrangement includes more than a central unit: ducts, room connections, controls and maintenance access form part of the complete system serving the dwelling.
How this term relates to your project
When a home is extended or rearranged, consider how new and existing rooms fit the system. Ask what information is available about the installation and what needs checking. Adding another connection does not prove that distribution across the whole house remains appropriate. Discuss duct routes early because they can influence ceilings and cabinets.
Include adjustment and user instruction in the work scope. Heat recovery may form part of the selected arrangement, but balanced ventilation is not itself a guarantee of comfort or a particular energy benefit. Retain the final system information so future changes can be assessed against the actual installed configuration.