FL16821 – Custom Window Systems Inc.
Florida product approval FL16821-R4 for Windows – Single Hung, as listed in ProdApproval’s data as of Sep 29, 2026.
- FL#
- FL16821-R4
- Manufacturer
- Custom Window Systems Inc.
- Code version
- 2023 Florida Building Code
- Status in our data
- Approved
- Products
- 1
Official record on floridabuilding.org →Use on a spec sheet →
Verify approval status on floridabuilding.org before submitting.
Approved products under FL16821-R4
| Approval # | Model | Description | Design pressure | Wind-borne debris | HVHZ | Outside HVHZ |
|---|---|---|---|---|---|---|
| FL16821.1 | 3500 Single Hung | SH-3500 Aluminum Single Hung Window, Fin. | +30/-30 | No | No | Yes |
Fill a spec sheet with FL16821
On the contractor form, go to the Windows – Single Hung row and type 16821 in the Florida Product Approval # box to fill the row. Walton County users can print a PDF that follows the county’s sheet; see the Walton County Product Approval Specification Sheet guide.