Room Airflow Balancer
See where your system's air actually goes — and how damper adjustments move it to the room you care about. Tap a room, tell us more or less, and get suggested damper settings.
Total airflow
1200 CFM
held constant (ECM-like)
Supply static
0.19 in. w.c.
at the plenum
Total external static
0.47 in. w.c.
✓ healthy
Your room
–
tap a room to track it
Your duct system — live airflow at every register
Drag anywhere along a duct to work its damper: green is the open part, gray is how far the damper is closed.
Balance a room
1. Tap the room you care about on the diagram above.
2. What do you want?
Dampers (0% = fully open)
Trunk dampers (at the plenum)
Branch dampers
System details (for the pros)
| Trunk | Segment / room | Diameter | Length | Fitting equiv. |
|---|---|---|---|---|
| Trunk 1 | Trunk 1 · Master suite | 8" | 8 ft | 35 ft |
| Trunk 1 | Hallway | 6" | 10 ft | 65 ft |
| Trunk 1 | suite run | 8" | 10 ft | 10 ft |
| Trunk 1 | Master bath | 5" | 12 ft | 80 ft |
| Trunk 1 | Master bedroom | 7" | 8 ft | 60 ft |
| Trunk 2 | Entry | 6" | 18 ft | 80 ft |
| Trunk 3 | Kitchen | 7" | 22 ft | 95 ft |
| Trunk 4 | Living room | 8" | 25 ft | 80 ft |
| Trunk 5 | Trunk 5 · Bedrooms | 7" | 15 ft | 35 ft |
| Trunk 5 | Bedroom 2 | 6" | 12 ft | 75 ft |
| Trunk 5 | Bedroom 3 | 6" | 18 ft | 90 ft |
Duct friction from the round metal duct relation (0.109136·Q1.9/D5.02 per 100 ft) with Manual D-style equivalent lengths for takeoffs, elbows, and boots. Dampers modeled as butterfly-type loss coefficients. Return side + filter + coil allowance ≈ 0.28 in. w.c. at 1200 CFM. In fixed-airflow mode the blower holds total CFM like an ECM motor; in PSC mode total airflow falls as the system is choked down.
Want it measured, not estimated?
This tool shows how balancing works on a typical duct layout. Real systems vary with duct condition, flex compression, and register types. Vargas HVAC can measure your actual airflow with calibrated instruments and balance it properly.