MVHR & Ventilation System Calculator
Estimate room-by-room airflow and find a suitably sized heat recovery unit for your home in minutes.
Takes only 2 minutes
Quick and simple process that saves your time
Smart Selector
Takes only 2 minutes
Quick and simple process that saves your time
Smart ORO Haus algorithm
Flow and pressure load analysis based on your rooms
Clear initial recommendation
Suitable capacity options with review notes where needed
100% free recommendation
Download ventilation system guidelines instantly
Project
Rooms
Enter the shared area and select “Living room with kitchen”. We create two zones: 80% living, 20% kitchen. You can edit both areas.
Start from a layout
Pick a typical room layout and tweak it, or add rooms one at a time.
| Room | Area | Floor | People in room | Airflow | Direction |
|---|
Where shall we start?
Pick a ready-made room layout or start from scratch.
Frequently asked questions
Common questions on how to choose a heat recovery unit and calculate your ventilation system requirements.
Recommendation and planning guidance. This is not a final ventilation design.