48" x 72" BA-SVSG-B-GT Smoke Vent Security Grille, Bolt-In Flange, Gray Powder Coat

The 48" x 72" BA-SVSG-B-GT Smoke Vent Security Grille, Bolt-In Flange, Gray Powder Coat provides heavy-duty intrusion deterrence and fall protection over rooftop smoke vent openings.

The grille features a bolt-in flange, engineered to mount directly to the inside face of the smoke vent or structural support frame for a secure, flush fit. Its body is built from ½" diameter solid steel rods welded on a 6" x 12" grid pattern, giving it strength without restricting airflow.

It’s finished in a weather-resistant gray powder coat, securing vulnerable roof penetrations while preserving a full open area for emergency smoke release.

Why Choose 48" x 72" BA-SVSG-B-GT Smoke Vent Security Grille, Bolt-In Flange, Gray Powder Coat?

• Protects Vulnerable Roof Openings: The 1/2-inch steel rod grille creates a robust physical barrier that supports both rooftop security and fall protection.
• Flexible Interior Mounting: The bolt-in flange can mount inside the smoke vent or to its support structure, providing options where a drop-in configuration is not suitable.
• Protection Without a Solid Obstruction: Its welded 6-inch by 12-inch grid adds coverage across the opening while retaining an open configuration.
• Built for Long-Term Rooftop Use: Welded steel construction and a factory-applied powder-coat finish provide a durable solution for exposed rooftop applications.

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-B-GT?

• Opening Size: 48" x 72"
• Material: 1/2" diameter steel rod
• Grid Pattern: 6" x 12" rod spacing
• Optional 6-inch by 6-inch, 8-inch by 8-inch, or 12-inch by 12-inch spacing
• Flange: Bolt-In (bolt-in flange)
• Finish: Industrial Gray Powder Coat.
• Mounting: At the smoke vent curb
• Application: Roof smoke vent security

Please note: Order size is roof opening size.

What Comes Standard and What Can Be Configured?

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

• Welded ½" steel rod grille 6” x 12” bar grid.
• 14-gauge steel angle bolt-in flange
• Factory gray powder coat finish.

Confirm the smoke vent's opening size and flange type at the time of order, so the grille fits the vent correctly. Silver and gray powder coat finishes are available; this model is finished in gray.

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 bolt-in flange is designed to mount inside the smoke vent or to its support structure. Confirm that the ordered grille dimensions match the roof opening and verify the available mounting location before installation. Flange mounting holes and mounting hardware are supplied by others.

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

The BA-SVSG-B-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
• Accessible roofs needing vent 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.

What is the difference between drop-in and bolt-in flanges?

A drop-in flange mounts underneath the smoke vent flange prior to vent placement. A bolt-in flange mounts directly to the inside face of the vent frame or support structure, making it ideal for existing or retrofit installs.

What finishes are available?

Silver and gray powder-coat finishes are offered. This model ships in gray.

What is the grille made of?

It is built from a 1/2" diameter steel rod welded to a 6" x 12" grid for strength and durability.

Protect Your Rooftop Smoke Vent Openings

Add security and fall protection to a rooftop smoke vent with the 48" x 72" BA-SVSG-B-GT. Its welded steel grid and bolt-in flange provide durable coverage with flexible mounting inside the vent or to its support structure.

Secure your rooftop penetrations with fall protection. Call us at +1-888-327-5471 or request a quote online for contractor pricing, submittals, and custom grid spacing on the BA-SVSG-B-GT.