48" x 48" BA-SVSG-D-GT Smoke Vent Security Grille, Drop-In Flange, Gray Powder Coat

The 48" x 48" BA-SVSG-D-GT Smoke Vent Security Grille, Drop-In Flange, Gray Powder Coat provides heavy-duty intrusion deterrence and fall protection over rooftop smoke vent openings.

Built from ½" diameter solid steel rods welded in a 6" x 12" grid, the grille offers strength without blocking airflow. It's framed with a 14-gauge steel drop-in angle flange that sits flush beneath the smoke vent flange for a fast, secure install.

Finished in a durable, weather-resistant gray powder coat, it secures vulnerable roof penetrations while preserving proper airflow and smoke release.

Why Choose 48" x 48" BA-SVSG-D-GT Smoke Vent Security Grille, Drop-In Flange, Gray Powder Coat?

• Heavy-Duty Welded Steel Construction: Engineered with solid ½" diameter steel rods welded to a structural 14-gauge steel angle flange.
• Preserves Smoke Release Performance: Standard 6” x 12” rod spacing maintains the required open airflow area for thermal smoke venting during emergency activation.
• Drop-In Angle Flange Integration: 1-¼" x 1-¼" drop-in flange seats cleanly on the curb underneath the vent flange for streamlined installation.
• Durable Steel Build and Gray Texture Finish: Heavy steel rod construction stands up to rooftop weather, while the neutral Gray Texture Powder Coat (GT) withstands harsh outdoor rooftop environments.
• Vent-Sized Fit: Sized to common smoke vent openings, so it integrates cleanly with the existing vent.

Not sure which grille configuration fits your smoke vent? Contact our specialists to confirm the roof opening size and whether a drop-in or bolt-in flange is appropriate before ordering.  

What Are the Key Product Specifications for the BA-SVSG-D-GT

• Opening Size: 48" x 48"
• Material: 1/2" diameter steel rod
• Grid Pattern: 6" x 12" rod spacing
• Flange: Drop-In (1-1/4" x 1-1/4" drop-in flange)
• Finish: Gray texture powder coat
• Mounting: At the smoke vent curb
• Application: Roof smoke vent security
• Roof Opening Dimensions: Min 48" x 48" to Max 60" x 96" (Custom sizes configured within these bounds)
• Fasteners/Holes: Flange mounting holes and mounting hardware provided by installer/others.

Please note: Order size is roof opening size.

What Comes Standard and What Can Be Configured?

Every BA-SVSG-D-GT ships with the following as standard:

• Welded ½” steel rod grille on a 6" x 12" grid
• A 14-gauge steel 1-¼" x 1-¼" drop-in flange
• Gray texture powder coat finish

Need a different grille size, bar spacing, or flange configuration? Submit your requirements through our custom solutions form.

What to Know About Installation Requirements

The drop-in flange mounts before and underneath the smoke vent flange. Confirm that the ordered grille dimensions match the roof opening and coordinate installation with the smoke vent manufacturer’s requirements. Flange mounting holes and mounting hardware are supplied by others.

Who Specifies BA-SVSG-D-GT and Where Is It Used?

The BA-SVSG-D-GT is typically specified by facility managers, security consultants, roofing contractors, and building owners protecting rooftop smoke vent openings.

Common applications include:

• Commercial and industrial roof smoke vents
• Warehouses and distribution centers
• Schools and institutional buildings
• Facilities with rooftop security concerns
• Rooftops where smoke vent openings require added security and fall protection

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Frequently Asked Questions About Smoke Vent Security Grilles

Does the grille block the smoke vent from working?

No. The open 6" x 12" rod grid maintains the vent opening's airflow and smoke-release function while adding a physical security barrier.

Does the security grille provide fall protection?

Yes. The welded ½" steel rod design provides both intrusion resistance and fall protection over roof deck openings

When is the drop-in security grille installed?

This model must be installed on the curb prior to placing and securing the smoke vent over the roof opening.

What is the grille made of?

It is built from a ½" diameter steel rod welded to a 6" x 12" grid for strength and durability.

Will it fit my smoke vent?

It is sized to common smoke vent openings. Confirm your vent's opening size and flange type at the time of order, to ensure it fits correctly.

Protect Your Rooftop Smoke Vent Openings

Protect vulnerable roof penetrations with the 48" x 48" BA-SVSG-D-GT, a heavy-duty security grille that combines intrusion deterrence and fall protection in one easy-to-install unit.

When you’re ready to move forward and protect your rooftop smoke vent openings, call +1-888-327-5471 or request a quote. From product questions to order support, our team is ready to provide responsive, knowledgeable service at every step.