#602 DucTite® register box with snap rail flange conforms to 2009 IRC M601.4.1 which requires joints and seams to be "substantially airtight".
M&M Ductite® Uninsulated Register Box, Model: 602, 8 in Length, 4 in Width, Additional Information: 4 in Collar
| Additional Information | : | 4 in Collar |
| Length | : | 8 in |
| Model | : | 602 |
| Width | : | 4 in |
M&M 602844