CFM & Grille Sizer
Size a room, see how much air it needs, and find the grille that moves it quietly.
Loading airflow data…
Total airflow is split evenly between them.
5.0
Default comes from the room type. Override for tight or leaky construction.
500 FPM
Sizing aims for this. Lower is quieter, higher throws farther.
Measure the duct opening in the wall, floor or ceiling, not the old faceplate.
The grille overlaps the opening on every side.
Exact matches first, then the nearest stocked sizes.
Airflow this room needs
0
CFM total
0CFM per vent
0cubic feet
0sq ft floor
0CFM sq-ft check
Face velocity of the best match
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Show the math
Grilles that fit this airflow
Grilles for this opening
Whole-house list
| Room | Size | ACH | CFM | Vents | CFM each | |
|---|---|---|---|---|---|---|
| Total | 0 | |||||
Where the numbers come from. Required airflow uses the air-changes-per-hour method: room volume × ACH ÷ 60. Grille selection uses each product’s published effective area (Ak) from its manufacturer airflow table, so face velocity is CFM ÷ Ak, not a generic free-area assumption.
Sizing guidance, not a substitute for a Manual J load calculation on new construction or a full system replacement.
- Choosing a selection results in a full page refresh.