M&M Insulated Register Box, Series: 640R6, 5 in, 8 in Length, 4 in Width, 4 in Height, 30 ga, Steel, Galvanized, Silver, R-Value: R-6
| R-Value | R-6 |
| Length | 8 in |
| Width | 4 in |
| Height | 4 in |
| Material | Steel |
| Finish | Galvanized |
| Color | Silver |
- Lined with 1-1/2 in ductliner providing R-Factor of R-6
- 4 in tall without snap rail flange
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