Heat recovery transfers heat between extract and supply air. Comfort also depends on ducts, balancing, acoustics and maintenance.
Supply and extract
Supply fresh air to occupied rooms and extract from designated rooms under the design. Provide transfer routes that work with internal doors closed.
Heat exchanger and filters
The exchanger reduces ventilation heat loss; filters protect the system and capture contaminants according to their class. Dirty filters change system resistance.
Ductwork and balancing
Sizes, bends and lengths affect pressure and noise. Measure and balance terminal airflows after installation rather than rely on the unit’s maximum rated flow.
Summer bypass
A bypass can route air around the exchanger under appropriate conditions. It is not refrigeration and cannot guarantee cooling when outdoor air is warmer.
Noise and condensate
Plan acoustic placement, appropriate velocities and accessible condensate drainage. Address frost protection according to the selected equipment.
Maintenance and limits
Leave access for filter changes and cleaning. Ventilation does not replace source control, a coordinated kitchen extraction strategy or required cooling.
| Item | Parameter | Check / result |
|---|---|---|
| Filter | Resistance | Accessible replacement |
| Terminals | Airflow | Balancing |
| Unit | Noise and water | Location + drainage |
What this means for your project
Request duct routes, design airflows, acoustic provisions and a commissioning report. Include ventilation in the critical-power scenario.