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Model
| Spiral Duct Register |
| Steel Construction |
SDGR ST |
| Aluminum Construction |
SDGR AL |
| Galvanized Steel |
SDGR GV |
| Price SDGR Spiral Duct Return Grilles were specifically designed to be mounted on round or spiral ducts without the use of any transitions. Gaskets placed at each end of the grille allow it to blend
seamlessly with the duct. An additional gasket placed around the inlet provides an air seal between the grille and the duct. The SDGR series is available in steel (SDGR ST ) or galvanized steel (SDGR GV)
construction, and features high quality formed frames. The galvanized steel model (SDGR GV) can be installed unpainted; it is also an excellent choice for applications where the grille needs to be
field painted to match duct finish. |
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| Features |
- Available in either steel (SDGR ST) or galvanized steel (SDGR GV) construction.
- Closed cell foam gasket attached to the border provides a tight seal around openings in the duct.
- Perforated screen, staggered round
3/16" (5) hole on 1/4" (6) centers.
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Mounting / Finish Options
| Fastening |
| Countersunk screwholes |
A |
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| Finish |
| White Powder Coat |
B12 |
| For optional and special
finishes see color matrix.
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 Product Selection Checklist |
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- Select Unit Size based on desired performance characteristics.
- Select Finish.
Example: SDGR // 12 // 4 // GV // A /B12 |
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Recommended SDGR Size
for Minimum Duct Diameter
| Duct Size (in) ø |
Min. Nom.
Width (in) |
Max. Nom.
Width (in) |
| 8" - 13" |
-- |
4" |
| 14" - 21" |
4" |
6" |
| 22" - 31" |
4" |
8" |
| 32" - 41" |
4" |
10" |
| 42" - Over |
4" |
12" |
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