Manufacturer and supplier of roof products and accessories for the metal building industry since 1964

ExoVent™ SL | Single Leaf Daylighting Smoke Vent

ExoVent SL™ | Single Leaf Daylighting Heat & Smoke Ventilator

R&S Non-Listed Skylight Lid Automatic Smoke Vents are occasionally accepted by regional authorities in areas with no snow load requirements. Municipal fire codes are met with the added benefit of allowing natural daylight to enter the building. Curb may be constructed of corrosion-resistant aluminum or super cost-effective steel.

  • Description
  • Model Guide
  • Sizes and Weights
  • Documents
  • R&S Insights


Material 0.063″/0.080″ aluminum
20/18 GA galvanized steel
1″ Rigid Insulation R7.2
Construction Mitered corners, fully welded seams
Full perimter EPDM bulb gasket mechanically secured to top flange
7-1/2″ high curb
Skylight Lid White copolyester outer dome
Clear inner dome
Frames include sealants and condensate provisions
Operation UL Listed Fusible Link activation temperatures (F): 165, 212, 286, 370, 520
Interior and exterior opening provisions
Gas Springs Low spring rate nitrogen gas springs for smooth operation. Black cathodic epoxy finish
Pitch Non-pitch corrected, slopes with roof
Finish Aluminum mill finish
Powder coat (standard colors or custom)
Kynar (exact match)
Accessories 14 GA backer-channel
Sealants, fasteners
Warranty 1 Year

Metal Building – Type Seam Clip/Layover Side Flanges

Standard design features with seam-to-seam / layover side flanges. Highest level of weather-tightness for metal building applications.

Curb Up-slope Flange installs under panel
Panel closures welded
4″ high water diverter
Curb Down-slope Flange installs over panel
Caps (straps) welded or shipped loose
Minimum 3″ down-slope flange
Curb Side Flanges Seam-to-seam, integrates with roof panel
Minimum 3″ between curb sidewall and panel seam

Metal Building – Type Flat Side Flanges

Standard design features with flat side flanges. Lower cost option.

Curb Up-slope Flange installs under panel
Panel closures welded
4″ high water diverter
Curb Down-slope Flange installs over panel
Caps (straps) welded or shipped loose
Minimum 3″ down-slope flange
Curb Side Flanges 3″ flat flange
Minimum 3″ between curb sidewall and panel seam

Metal Building – Type If Curb (Internally-Flanged)

Standard design features with base flange broken inward.

Curb Up-slope Up-slope base flange breaks inward 2″
Includes 2-peice water diverter assembly and backer channel
Curb Down-slope Down-slope base flange breaks inward 2″
Integrated caps in curb wall accept panel highs
Curb Side Flanges Side base flanges break inward 2″
Backer Channel Backer channel and water diverter assembly Included

Conventional / Built Up Roofs

Standard design features with 3″ flat flange and self-flashing provisions

Base Flanges 3″ flat perimter base flange
Self-Flashing Provisions Perimeter cap flashing accepts roof material


McCabe Link McCabe resettable Link offers thermal / electronic activation of release. Provides flexible integration with existing fire safety equipment. Simplifies required annual testing process as no cutting is required. Can be electronically activated from ground level.
Stainless Steel Hardware Hinge assembly constructed of type 316 stainless steel for ultimate protection against corrosion

Skylight Lid Non-Listed Automatic Smoke Vent – Model Guide

Model WxL Base Material Base Type Link Type Link Temp Options (list all that apply)
SHD: Single Dome

SHDD: Double Dome

SHDL: Single Dome Louvered Base

AL: Aluminum

ST: G-90 Galvanized Steel

SS: Stainless Steel

SF: Self Flashing

CM: Curb Mount

MB: Metal Building Flat Flange

MBSC: Metal Building Seam Clip

MBLO: Metal Building Layover

MBIF: Metal Building Internally Flanged

F: Fusible Link

M: McCabe Re-settable Link






SS: Stainless Steel Hardware

FP: Fall Protection Screen


Example: SHDD-4896-AL-MBSC-F165-FP is a non-listed automatic heat and smoke vent with a double dome skylight feature, aluminum construction with an integral seam clip metal building curb, a fusible 165F link, and integral fall protection screen

Standard Sizes and Shipping Weights

Non-Listed Skylight Lid Smoke Vent Models (Single Leaf)


Model Inside Clear Opening Weight (Steel) Weight (Aluminum) Open Capacity Lid Uplift Rating
SHD-4848 48″ x 48″ 150 lbs 90 lbs 2 PSF 30 PSF
SHD-4896 48″ x 96″ 240 lbs 135 lbs 2 PSF 30 PSF
SHD-L-4896 48″ x 96″ 260 lbs 155 lbs 2 PSF 30 PSF

Non-Listed Heat & Smoke Vents

Single lid design when UL 793 is not required. Offers similar performance at a reduced price.

Product Description Model Submittal Specifications Installation Warranty
Single Dome Louvered SHD-L PDF WORD PDF


Options Model Submittal Specifications Installation
Security Bars Type 1 SB-1 PDF WORD
Security Bars Type 2 SB-2 PDF WORD
Security Bars Type 3 SB-3 PDF WORD

R&S Insights Blog

R&S Competitive Advantage – Smoke Vents

R&S supplies among the highest quality vents at very competitive prices. Due to the higher quality of our product we… Learn More

Smoke Vent Systems for General Contractors

In the construction and building-safety world, smoke vent systems are extremely important. These systems do more than just comply with regulations, they are essential for keeping people safe and protecting the building’s structure…  Learn More

Selecting the Best Architectural Smoke Vents

Selecting the best architectural smoke vents is a critical decision for any architect or building owner… Learn More

Smoke Vents – Operable vs. Melt-Outs – Which is Best?

When evaluating operable smoke ventilators versus melt-out units, architects, builders and contractors should weigh the pros and cons of each before making a decision… Learn More

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R&S manufactures a vast array of products to fit your project needs. We aim to supply all of your metal building roof accessory needs, not just one product. Why go to multiple vendors when R&S can supply it all?