The standard size 601 register box with snap rail flange is available in 9 different sizes for connection to round duct from 4 in through 9 in Dia.
M&M Standard Uninsulated Register Box With 1 in Snap Rail Flange, Series: 601, 7 in, 10 in Length, 6 in Width, 30 ga, Steel, Galvanized, Silver
| Gauge | 30 ga |
| Model | 601 |
| Series | 601 |
| Size | 7 in |
| Length | 10 in |
| Width | 6 in |
| Material | Steel |
| Finish | Galvanized |
| Color | Silver |
- Register boxes size from 5 in through 12 in Dia connections
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