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| Color | : | Silver |
| Finish | : | Galvanized |
| Gauge | : | 30 ga |
| Length | : | 8 in |
| Material | : | Fiberglass, Steel |
| Model | : | 643 |
| Size | : | 5 in Collar |
| Width | : | 4 in |
M&M Insulated Register Box with Tab and Snap Rail Flange, 643 Model, 5 in Collar Size, 8 in L, 4 in W, 30 ga, Fiberglass, Steel, Galvanized, Silver
- 643SST steel slant top register boxes are lined with 1/2 in R2 duct liner