★ 54 five-star reviews
Calculators and tools
Tools and answers to the most common air ventilation questions. Try our calculators, browse frequently asked questions, or explore articles where we discuss air ventilation in a practical way.
Calculators and tools
We have developed three tools that help you understand air ventilation and make better decisions. The calculators provide indicative estimates—accurate results always require on-site measurements.
Estimate how replacing the air ventilation system affects heating energy consumption and costs. Enter the building details and compare the current situation with a new solution—the results update in real time. Open the energy consumption calculator →
Calculate the theoretical airflow through openings, door gaps, and make-up air openings. Enter the opening dimensions, discharge coefficient, and pressure differential, and you’ll get an indicative estimate of the flow rate. Open the airflow calculator →
A sign language fingerspelling practice app that we developed in collaboration with Helsingin kuuloyhdistys ry. The app came about when a deaf air ventilation technician joined our team—and we decided to invest in sign language skills across the entire team. Open the practice app →
Estimate the time and cost of a ventilation duct installation. Enter duct size, fittings and working conditions – the calculator works out the required hours and number of installers in real time. Open HVAC installation calculator →
Frequently asked questions
Below you’ll find answers to the most common air ventilation questions. The questions are grouped by topic: inspections, maintenance, cleaning, installation, and design. If you can’t find an answer, remote consulting (€118) is the fastest way to get an expert answer for your specific situation.











