Sunoptics Signature Series skylights are prismatic plastic domes on an aluminum frame that sits over a roof curb. As a Sunoptics distributor, we list the skylights, the SSVT and SVT2 smoke vents, and the guards that go with them. Each model name packs type, size, lens and rating into one line, such as SMD 4080 C2W1. This guide decodes those names and matches each unit to its curb and guard, using only the Sunoptics documents posted on our product pages.
How to read an SMD skylight model number
Take SMD 4080 C3W0 HVHZ as the example:
| Segment | What it means |
|---|---|
| SMD | Signature Series fixed (non-opening) skylight, curb mounted, on the thermally broken 800MD frame |
| 4080 | Nominal size in feet: 4 x 8. 4040 is 4 x 4, 4060 is 4 x 6, 5060 is 5 x 6 |
| C2W1 or C3W0 | The lens pair. C2W1 is 0.165 inch clear prismatic polycarbonate over 0.125 inch white prismatic polycarbonate. C3W0 is clear prismatic polycarbonate over white prismatic acrylic |
| FMRTG or HVHZ | FMRTG marks the FM rating. HVHZ marks the version built and tested for Florida's High Velocity Hurricane Zone |
The Sunoptics documents we have do not define C2W1 or C3W0 letter by letter, so we describe each by its cut sheet. Our SMD 4060 C2W1, SMD 4080 C2W1 and SMD 5060 C2W1 listings are marked FM rated even though FMRTG is not in their names. If your insurer requires FM, say so on the quote request.
Sizes and curb fit
Sunoptics does not supply the curb, and the size code is only nominal. The data sheet says the finished curb, flashing included, should be 1 inch smaller than the skylight frame's inside dimension, leaving 1/2 inch of clearance per side.
| Size | Units we list | Frame inside (in) | Finished curb outside, max (in) |
|---|---|---|---|
| 4040 (4 x 4 ft) | SMD 4040 C2W1 FMRTG, SMD 4040 C3W0 HVHZ | 51-1/4 x 51-1/4 | 50-1/4 x 50-1/4 |
| 4060 (4 x 6 ft) | SMD 4060 C2W1 | 51-1/4 x 75-1/4 | 50-1/4 x 74-1/4 |
| 4080 (4 x 8 ft) | SMD 4080 C2W1, SMD 4080 C3W0 HVHZ, SSCBL1 4080 W1, both SSVT 4080 vents | 52-1/4 x 100-1/4 | 51-1/4 x 99-1/4 |
| 5060 (5 x 6 ft) | SMD 5060 C2W1 | 63-5/8 x 75-5/8 | 62-5/8 x 74-5/8 |
| 5080 (5 x 8 ft) | SVT2 5080 smoke vent | 63-1/4 x 99-1/4 | 62-1/4 x 98-1/4 |
A Sunoptics 4080 fits the same 48 x 96 inch curb that curb makers call 4896: the AES 4896 ARC3 and the Curbs Plus CPC-3 4896 both measure 51 x 99 inches outside. For a 4040, the AES 4040 ARC3 and CPC-3 4040 measure 50 x 50 outside. The AES 5060 ARC6 is 62.375 x 74.375 outside.
FM-rated or HVHZ?
| C2W1 (FM rated) | C3W0 HVHZ | |
|---|---|---|
| Lens | 0.165 inch clear prismatic polycarbonate over 0.125 inch white prismatic polycarbonate | Clear prismatic polycarbonate over white prismatic acrylic |
| Approval | Tested under the FM 4431 method for fixed skylights | Florida product approval FL14086, tested to TAS 201, 202 and 203 |
| Design pressure | 40 psf | Plus or minus 60 psf |
| Hail rating on our listing | 2 inch | 2 inch |
The Florida evaluation report rates the HVHZ unit impact resistant, so no shutter is needed. Its installation drawing calls for #12 x 2 inch hex head screws within 8 inches of each corner and 12 inches on center, with 1-3/8 inch minimum embedment. Ask us for the current Florida and Miami-Dade documents before you submit.
Installing on the curb
- The curb must be square, flashed and level, with a top at least 1 inch wide for the seal.
- Leave 1/2 inch of nominal clearance on all four sides. The frame should drop on without force.
- Double and triple glazed units ship with air seal tape on the frame, so the curb top needs no caulk.
- Fasten with #12 x 1-1/2 inch hex washer head stainless screws, one per hole, run just snug. Overtightening distorts the frame, can crack the lenses and may void the warranty.
- ICC-ES report ESR-3557 requires the glazing to sit at least 4 inches above the roof.
Smoke vents: SSVT, SVT2 and SVT2CV
Sunoptics smoke vents use the 870B frame. In a fire, the fusible link melts and gas shocks open the vent doors to at least 90 degrees; interior and exterior pull rings open them by hand. The SVT2 comes UL/ULC 793 listed or FM approved (Class 4430). FM-approved units must be double glazed clear over high-white polycarbonate, rated for 10 psf snow load, fitted with a link of at least 360 F, and sized from 4060 to 5080.
We list the SSVT 4080 C2W2 10 360 (FM rated), the SSVT 4080 C2W2 10 370 (UL listed), the SVT2 5080 (UL listed) and the SVT2CV 4080, a UL-listed single-glazed vent with a continuous vent blade. The short SSVT name reads size, lens pair, snow load in psf, then link temperature. The long SVT2 name follows the Sunoptics ordering logic:
| Segment of SVT2CV 4080 SGZ CC1P125 WH 370FL 10LB 870B 1BL UL | Meaning |
|---|---|
| SVT2CV | Continuous-venting smoke vent (SVT2 is the standard vent) |
| SGZ or DGZ | Single or double glazed |
| CC1P125 or CC1 | Polycarbonate glazing (CC1P125 is 1/8 inch polycarbonate) |
| WH or CLWH | White lens, or clear over white |
| 370FL | Fusible link temperature, degrees F |
| 10LB | Snow load lift rating, 10 psf |
| 870B | Standard smoke vent frame |
| 1BL | One-blade continuous vent |
| UL | UL listed (FMRTG would mark FM approved) |
Set the vent on a level, square curb and remove the two transport safety plates only after it is fastened. Test each door with the exterior release; closing a door takes two people, one at each end.
Safety screens and guards
Sunoptics skylights ship without fall protection. In its fall protection letter, Sunoptics says a new 4 x 8 Signature Series skylight passed a 400 pound drop test, but warns that plastics age under UV and recommends a safety screen to meet OSHA 1910.29(e).
| Guard | Mounts | Sized by | Construction |
|---|---|---|---|
| CLPOG clip-on guard (4040, 4080, 5060) | Under the skylight, clipped to the curb top | Curb inside (W48 L96 is 48 x 96) | 8 gauge galvanized wire, 4 x 4 inch grid |
| BURGB 4080 burglar bars | Under the skylight, on the curb | Curb inside, 48 x 96 | 1/2 inch steel bars 5 inches on center across the short side; hardware sold separately |
| ESFP exterior screen (4040, 4080) | Over the skylight, attached to its frame | Skylight frame inside (W52.250 L100.250) | 3 gauge galvanized wire, 4 x 4 inch grid |
Sunoptics states that the CLPOG meets OSHA fall protection requirements and that the ESFP is designed and tested to the OSHA general industry standard. The curb inside should be 1/4 to 5/8 inch larger than a clip-on guard. The ESFP keeps the screen out of view from the floor, but operable smoke vents can only take interior screens. Background: OSHA fall protection for skylights.
FAQ
Will a Sunoptics 4080 fit my 4896 curb?
Usually. A standard 51 x 99 inch curb fits, as long as the flashed curb is no larger than 51-1/4 x 99-1/4 inches.
Are Sunoptics skylights made in the USA?
The 800MD data sheet says they are assembled in the USA and meet Buy America(n) requirements, with 10 and 15 year limited warranties available.
Can I put the ESFP exterior screen on a smoke vent?
No. Operable smoke vents can only use interior safety screens.
Next steps
The full line is on our Sunoptics brand page, drawings are on the skylight and smoke vent spec sheet pages, and matching curbs are on the roof curbs page. Send the model, quantity, curb outside dimension, rating and ship-to address through the skylight request for quote or smoke vent request for quote page, and we will confirm the configuration and lead time.
Product data on this page comes from the manufacturer's published data sheets, drawings and installation instructions, which are posted on each product page. Code references are to the current OSHA text. Always confirm requirements with the authority having jurisdiction for your project.
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