QuietScore › Bathroom & Utility Fans › Air King AK50S
Air King AK50S noise level
The Air King AK50S is quieter than the category median of 0.7 sones, and its 50 CFM rating makes it suitable for bathrooms up to roughly 50 sq ft.
Full specifications
| Brand | Air King |
|---|---|
| Model number | AK50S |
| Model name | Air King |
| Category | Bathroom & Utility Fans |
| Sound level | 0.5 sones (≈30 dBA, approximate) |
| Airflow | 50 CFM |
| Efficiency | 4.1 CFM/W |
| Duct size | 4 inch diameter |
| Speeds | 1 |
| Integrated lighting | No |
| ENERGY STAR certified | Yes |
| On market since | 2016-06-30 |
| Markets | United States, Canada |
Quieter alternatives with similar airflow
| Model | Sones | ≈ dBA | Airflow | Efficiency | |
|---|---|---|---|---|---|
| Greenheck SP-A70 | 0.1 | 7 | 70 CFM | 5.1 CFM/W | specs |
| Broan XB80=XB00HwithXB80F | 0.1 | 7 | 80 CFM | 13.8 CFM/W | specs |
| Greenheck SP-A90L | 0.1 | 7 | 99 CFM | 6.1 CFM/W | specs |
| AUPU BF4-S10CL | 0.1 | 7 | 100 CFM | 9.5 CFM/W | specs |
| Greenheck SP-LP0810W | 0.1 | 7 | 100 CFM | 10 CFM/W | specs |
Similar bathroom & utility fans
| Model | Sones | ≈ dBA | Airflow | Efficiency | |
|---|---|---|---|---|---|
| Broan AE50 | 0.5 | 30 | 50 CFM | 3.5 CFM/W | specs |
| Broan AE50=A000HF2WITHAE50F | 0.5 | 30 | 50 CFM | 3.5 CFM/W | specs |
| Broan AE50 = A000HFKTC WITH AE50F1 | 0.5 | 30 | 50 CFM | 3.5 CFM/W | specs |
| Broan AE50=A000HFKTwithAE50F1 | 0.5 | 30 | 50 CFM | 3.5 CFM/W | specs |
| Broan AE50=A000HFNFwithAE50F1 | 0.5 | 30 | 50 CFM | 3.5 CFM/W | specs |
Frequently asked questions
How many sones is the Air King AK50S?
The Air King AK50S is certified at 0.5 sones in ENERGY STAR lab testing, which is approximately 30 dBA. That is about as quiet as rustling leaves; most people cannot hear it over ambient room noise.
Is the Air King AK50S quiet?
At 0.5 sones, the Air King AK50S is quieter than 61% of the 811 certified bathroom & utility fans we track, and quieter than the category median of 0.7 sones.
How powerful is the Air King AK50S?
It moves 50 CFM, which is adequate for a bathroom of roughly 50 sq ft under the standard 1-CFM-per-square-foot guideline, at an efficiency of 4.1 CFM per watt.
Data provenance: Sound levels are certified lab measurements (sones) reported in the U.S. EPA ENERGY STAR certified products dataset — not manufacturer marketing claims. Source: ENERGY STAR Certified Ventilating Fans (US EPA), last fetched 2026-06-13. The dBA figure is an approximate conversion from sones — see our methodology.