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

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

It’s constructed from ½" diameter solid steel rods welded on a 6" x 12" grid pattern for load-bearing strength and airflow consistency. The grille is framed with a 14-gauge steel drop-in angle flange for a flush, secure installation without additional hardware or field modification.

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

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

• Dual Protection (Security + Fall Safety): Protects roof openings against both unauthorized roof-to-interior entry and accidental worker falls through smoke vent openings.
• Open Grid for Function: A 6" x 12" rod spacing maintains the vent opening's airflow and smoke-release function while adding security.
• Heavy-Duty Welded Steel Construction: Engineered with solid ½" diameter steel rods welded to a structural 14-gauge steel angle flange.
• Designed for New Vent Installation: The drop-in flange mounts before and underneath the smoke vent flange, allowing the grille to be incorporated as the vent is installed.
• Durable Steel Build and Powder Coat Finish: Heavy steel rod construction withstands rooftop weather, while the silver-textured powder coat finish resists corrosion from outdoor exposure.
• Sized to the Roof Opening: Because the order size matches the roof opening size, the grille can be selected for openings from 48" x 48” to 60” x 96”.

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-ST

• Opening Size: 48" x 48"
• Material: 1/2" diameter steel rod
• Grid Pattern: 6" x 12" rod spacing
• Grille Rods: ½” diameter steel rod
• Bar Spacing: 6" x 12" center-to-center standard (6" x 6", 8" x 8", or 12" x 12" optional).
• Flange: Drop-In (1-¼"" x 1-¼" drop-in flange)
• Finish: Silver 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-ST ships with the following as standard:

• Welded ½" steel rod grille with 6" x 12" bar spacing.
• 14-gauge steel 1-¼" x 1-¼" drop-in angle flange.
• Factory powder-coat silver texture 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 silver.

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-ST and Where Is It Used?

The BA-SVSG-D-ST 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 sets into the vent opening for a simpler install, while a bolt-in flange fastens more permanently. This model uses a drop-in flange.

Are mounting hardware and pre-drilled holes included?

No. Flange mounting holes and fasteners are provided by others (the installer) to suit specific curb materials.

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.

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, so it fits correctly.

Protect Your Rooftop Smoke Vent Openings

Protect your vulnerable smoke vent opening from unauthorized entry and fall hazards with the 48" x 48" BA-SVSG-D-ST. Its welded steel grid and drop-in flange provide durable coverage that integrates beneath the smoke vent flange.

Ready to move forward? 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.