HVAC Noise Analyzer: dB Meter

HVAC Noise Analyzer is a decibel meter built for ventilation, heating, air conditioning and fan noise. It shows not only how loud a room is in dB, but what kind of sound it is, at which frequencies, and how it compares with Finnish building requirements. Made for HVAC installers, commissioning and balancing, building inspectors, property managers and anyone bothered by a noisy duct, air conditioner or heat pump. SOUND LEVEL METER Live A-weighted sound level (LAS), maximum level (LAFmax with true 125 ms F time weighting), equivalent level (LAeq), dominant frequency and a third-octave spectrum. Switch between A, C and Z weighting. A 60-second level history graph shows how the noise changes while a fan speeds up or a damper is adjusted. NOISE TYPE The app identifies the noise type: airflow hiss, low-frequency rumble, sharp hiss from terminal units and diffusers, fan tone, electrical hum or whistle, and suggests what to check. TIMED MEASUREMENT (PREMIUM) Measure continuously or for 30 s, 1 min or 5 min. The measurement stops by itself and offers to save the result. ACCURATE MICROPHONE INPUT The microphone is read with the device's unprocessed audio source whenever the phone supports it. Ordinary recording passes through automatic gain control and noise suppression, which remove exactly the steady ventilation noise you want to measure. SPECTRUM ANALYZER Third-octave or octave band bars with max hold. Tap a band to see its value. Save a measurement as a reference before an adjustment and see the difference band by band afterwards. Export the spectrum as a CSV file for Excel or further acoustic analysis. NOISE LIMITS AND NR RATING (PREMIUM) Choose the room type and requirement, and the measurement is compared with: - Decree of the Ministry of the Environment 796/2017 (new buildings, building services equipment), including the stricter limit for tonal noise - Housing Health Decree 545/2015 (action limits), including the tonal correction and the low-frequency noise table for bedrooms The NR (Noise Rating) value is calculated from octave bands using the ISO/R 1996 curves. PDF REPORT (PREMIUM) Save measurements with a room name and notes, then create an A4 PDF noise report with a summary table, limit checks, NR rating, octave chart and noise type for each room. Share it by email or cloud storage. CALIBRATION A phone microphone is not a calibrated instrument. Compare the reading with a sound level meter once and set the correction. It is remembered. HELP AND LIGHT THEME Built-in help explains how to measure and how to read LAeq, LAFmax, the spectrum, NR and the limits, and answers common questions. It works offline. Choose a dark or light theme, or follow the system setting. FREE AND PREMIUM Free: sound level meter, spectrum analyzer, level history, noise type detection, calibration and up to 3 saved measurements. Premium is a one-time purchase with no subscription and no ads: limit comparison and NR rating, PDF report, unlimited saving, reference spectrum, timed measurement and CSV export. PRIVACY Audio is analysed on the device in real time and never recorded or stored. No account, no ads, no analytics, no network access. GOOD TO KNOW Results are indicative and do not replace a measurement with a class 1 sound level meter. Phone microphones attenuate frequencies below 100 Hz, and in very quiet rooms the phone's own noise limits the lowest measurable level. Languages: English, Finnish, Swedish.

Welcome to HVAC Noise Analyzer! Measure ventilation, heat pump and other building services noise with your phone. - Live sound level (LAeq, LAFmax), 1/3-octave spectrum and level history - Detects low-frequency, tonal and airflow noise - Calibration correction and built-in help Premium, a one-time purchase with no subscription and no ads: comparison with Finnish limit values, NR rating, PDF report, unlimited saving, reference spectrum, timed measurement and CSV export.