Standard Size #640R6 Register Boxes are lined with 1½" Ductliner to provide an R-Factor of R-6. The #640R6 Register Box is 4" Tall without Tabs.
| M&M Manufacturing Co. | |
|---|---|
| Product Category | HVAC Ductwork |
| Product Number | 640R61267 |
| Product Name | #640R6 Register Box 4" Tall wo/Tabs |
| Application | Commercial |
