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, 14 in, 16 in Length, 16 in Width, 30 ga, Steel, Galvanized, Silver
| Color | : | Silver |
| Finish | : | Galvanized |
| Gauge | : | 30 ga |
| Length | : | 16 in |
| Material | : | Steel |
| Series | : | 601 |
| Size | : | 14 in |
| Width | : | 16 in |
M&M 601161614