Best remodel
WhisperFit
Shallow housing and retrofit hardware solve the most common replacement constraints.
Side-by-side
The right Panasonic fan, without the suffix soup.
Filter by the job you need done. Exact features vary within each family, so verify the current model documentation before purchasing.
| Family | Typical CFM choices | Noise | Light / nightlight | Humidity | Housing profile | Best use | Tradeoff |
|---|---|---|---|---|---|---|---|
| Whisper Mighty RG-M79A | Selectable 70/90 CFM | Installed result depends on ducting | Fan-only model | No built-in humidity control | Compact | Value-focused room-side retrofit | Different housing and adapter sequence; no Flex-Z Fast Bracket |
| WhisperFit | Selectable; model dependent | Very quiet with good ducting | Available on variants | Model dependent | Shallow | Retrofits and constrained framing | Fewer advanced modules |
| WhisperGreen Select | Adjustable; broad range by model | Very quiet, pressure-aware | Available on variants | Optional modules / variants | Fuller depth | Advanced controls and continuous ventilation | More complex and costly |
| WhisperChoice | Selectable; model dependent | Quiet | Available on variants | Limited/model dependent | Compact | Value-focused replacement | Fewer premium controls |
| WhisperCeiling | Fixed or selectable by model | Quiet | Separate family variants | Model dependent | Standard | Planned new-construction installs | Less retrofit-friendly |
About specifications: Panasonic model families include many suffixes and regional updates. This table intentionally avoids pretending one number describes every variant. Use it to narrow the family, then confirm the exact current specification sheet.
Plain-English rankings
Best by situation.
Best controls
WhisperGreen Select
The stronger platform when continuous ventilation and sensing are central to the plan.
Best value
WhisperChoice
Quiet fundamentals for homeowners who do not need a complex control ecosystem.
Whisper Mighty
Compact, fan-only retrofit
The RG-M79A uses its own room-side housing sequence, a 3-inch / 4-inch adapter strategy, and selectable 70/90 CFM. It can be a practical value-focused option when that installation approach fits the existing ceiling and duct.
WhisperFit
Flex-Z retrofit flexibility
WhisperFit uses the Flex-Z Fast Bracket, offers selectable 50/80/110 CFM, and has fan-only and fan/light variants already covered in depth on BathExhaust.
See the WhisperFit Installation →
There is no universal winner: match the fan and installation system to the house.