QuietScore › Bathroom & Utility Fans › Delta SLM70D2
Delta SLM70D2 noise level
The Delta SLM70D2 is quieter than the category median of 0.7 sones, and its 70 CFM rating makes it suitable for bathrooms up to roughly 70 sq ft.
Full specifications
| Brand | Delta |
|---|---|
| Model number | SLM70D2 |
| Model name | BreezSlim |
| Category | Bathroom & Utility Fans |
| Sound level | 0.3 sones (≈23 dBA, approximate) |
| Airflow | 70 CFM |
| Efficiency | 7 CFM/W |
| Duct size | 3.00 inch diameter |
| Speeds | 2 |
| Integrated lighting | No |
| ENERGY STAR certified | Yes |
| On market since | 2025-11-24 |
| 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 | |
|---|---|---|---|---|---|
| Tech Drive TD-BF-06 | 0.3 | 23 | 70 CFM | 4.6 CFM/W | specs |
| Win Air BPT14-13E | 0.3 | 23 | 70 CFM | 4.6 CFM/W | specs |
| S&P PCD80XHP ME | 0.3 | 23 | 80 CFM | 14.4 CFM/W | specs |
| Broan 744L | 0.3 | 23 | 80 CFM | 2.9 CFM/W | specs |
| Broan RB80 | 0.3 | 23 | 80 CFM | 3 CFM/W | specs |
Frequently asked questions
How many sones is the Delta SLM70D2?
The Delta SLM70D2 is certified at 0.3 sones in ENERGY STAR lab testing, which is approximately 23 dBA. That is near the threshold of human hearing — effectively silent in a normal room.
Is the Delta SLM70D2 quiet?
At 0.3 sones, the Delta SLM70D2 is quieter than 75% of the 811 certified bathroom & utility fans we track, and quieter than the category median of 0.7 sones.
How powerful is the Delta SLM70D2?
It moves 70 CFM, which is adequate for a bathroom of roughly 70 sq ft under the standard 1-CFM-per-square-foot guideline, at an efficiency of 7 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.