FL9520 – Custom Window Systems Inc.
Florida product approval FL9520-R9 for Windows – Mullions, as listed in ProdApproval’s data as of Sep 29, 2026.
- FL#
- FL9520-R9
- Manufacturer
- Custom Window Systems Inc.
- Code version
- 2023 Florida Building Code
- Status in our data
- Approved
- Products
- 5
Official record on floridabuilding.org →Use on a spec sheet →
Verify approval status on floridabuilding.org before submitting.
Approved products under FL9520-R9
| Approval # | Model | Description | Design pressure | Wind-borne debris | HVHZ | Outside HVHZ |
|---|---|---|---|---|---|---|
| FL9520.1 | 3" Alum. Tube Mullion | 3" Alum. Tube Mullion, Horizontal & Vertical, Fin & Flange applications. (IMPACT-HVHZ) | N/A | Yes | Yes | Yes |
| FL9520.2 | 3" Alum. Tube mullion | 3" Alum. Tube Mullion, Horizontal & Vertical, Fin & Flange applications. (IMPACT-WIND ZONE 3) | N/A | Yes | No | Yes |
| FL9520.3 | 4" Alum. Tube Mullion | 4" Alum. Tube Mullion, Horizontal & Vertical, Fin & Flange applications. (IMPACT-WIND ZONE 3) | N/A | Yes | No | Yes |
| FL9520.4 | 4" Alum. Tube Mullion | 4" Alum. Tube Mullion, Horizontal & Vertical, Fin & Flange applications. (IMPACT-HVHZ) | N/A | Yes | Yes | Yes |
| FL9520.5 | 5 1/2" Alum. Tube Mullion | 5 1/2" Alum. Tube Mullion, Horizontal & Vertical, Fin & Flange applications. (IMPACT) | N/A | Yes | Yes | Yes |
Fill a spec sheet with FL9520
On the contractor form, go to the Windows – Mullions row and type 9520 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.