Broilmaster B Series Stainless Gas Grill Size Guide: 25"–40"

Before you commit to a B Series size, measure the opening you have to work with — or, if you're framing a new island, the opening you intend to build. Three dimensions decide whether a Broilmaster B Series will fit:

• Width. Measured side-to-side along the front face of the island. The grill head drops in from above. The cutout width must match the head: 31″ for BSB324, 38″ for BSB405. (BSB253 — confirm separately, see callout below.)
• Depth. Measured front-to-back from the inside of the front island wall to the inside of the back wall. The cutout depth is 20½″ on both BSB324 and BSB405 — the same head depth applies regardless of width.
• Height (drop). Measured top-of-counter down to the bottom of the island enclosure. The cutout height is 8½″ on both BSB324 and BSB405 — this is the depth of the head body that hangs into the island below the counter line.

Beyond the cutout itself, also confirm the clearance envelope around the island: a minimum of 16″ from each side of the grill to any combustible material (such as a wood-frame wall, fence, patio furniture, or the wall of the home), 18″ from the back of the grill to any combustible material, and zero combustible overhead (no covered porch, no awning, no carport, no overhang). The Clearances section below lists these in full.

Cutout dimensions for the B Series Stainless head:

Broilmaster sells a stainless steel built-in sleeve as an optional accessory. The sleeve sits inside the rough opening and protects combustible framing from the grill heat. Sleeve cutouts are slightly larger than the bare-head cutouts because the sleeve adds wall thickness on each side. From the BR0227 spec sheet:

Per Broilmaster's installation requirements, the grill must maintain the following minimum clearances from the body of the grill to any combustible material:

Combustible materials include — but are not limited to — wood-frame walls, fences, patio furniture, the wall of the home, vinyl siding, wood decking, and any covered overhead structure. Stone, masonry, concrete, and properly rated stainless steel are not combustible.

The grill cannot be installed or operated under any combustible overhead structure. This includes carports, covered porches, awnings, or overhangs. A clear vertical air column above the grill is required for combustion-product ventilation.

Per the Broilmaster owner's manual, the natural gas inlet pressure at the grill should be set to 7.0 inches water column (7.0″ WC). Connect via the NG hose and quick-disconnect kit available from the dealer; built-in installations should run a hard-piped supply with a manual shutoff valve isolated from the grill before any leak test.

Total natural gas BTU demand by model (peak):

• BSB253 (25″, 2-burner): demand not in current literature; contact dealer to verify before line sizing.
• BSB324 (32″, 4-burner): 4 × 14,000 BTU main = 56,000 BTU/hr + 14,000 BTU rear rotisserie = 70,000 BTU/hr peak.
• BSB405 (40″, 5-burner): 5 × 14,000 BTU main = 70,000 BTU/hr + 15,000 BTU rear rotisserie = 85,000 BTU/hr peak.

Size the supply line based on the peak demand of the grill plus any other appliances drawing from the same supply (range, water heater, dryer, fire feature). Consult a licensed gas plumber for the appropriate pipe diameter and length.

The B Series propane configuration uses a 20-pound LP cylinder secured in the cart's cylinder bracket (for cart-mounted setups) or in a code-compliant cylinder enclosure (for built-in setups). Propane regulator and hose assembly is supplied with the grill. Per the manual, do not use a propane gas cylinder with a capacity greater than 20 pounds with this grill.

If the grill is installed in an island enclosure with a propane cylinder, the enclosure must include vent register openings — Broilmaster sells a Vent Register Kit as a stainless steel built-in component. The cylinder must be arranged upright for vapor withdrawal, and the enclosure must remain free of obstructions to combustion-air ventilation.

The grill and its individual shutoff valve must be disconnected from the gas supply piping system during any system pressure testing at test pressures in excess of 1/2 PSIG. The grill must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG.

The 16-inch side and 18-inch rear clearances apply to combustible framing. If you build the island with non-combustible framing — masonry block, concrete, prefabricated stainless steel — these clearances do not apply to the framing itself, but the surrounding combustibles around the island still need the same envelope. Most prefab outdoor kitchen islands are designed to non-combustible specs from the supplier.

If the island is wood-frame construction with a non-combustible facing, the grill still needs its 16/18 clearance envelope to the wood framing inside. The optional Broilmaster stainless steel built-in sleeve provides one layer of protection but does not replace the clearance requirement.

If the propane configuration is being used in a built-in island, plan for a code-compliant access door for cylinder swap-out. The Broilmaster Door Kit is the matching stainless steel access panel; it carries the Limited Lifetime warranty against rust-through alongside the rest of the stainless built-in components. The access door should open with the cylinder upright and accessible without the user reaching into the heat zone behind the grill.

For propane installations inside an island enclosure, vent register openings are required at the bottom and top of the enclosure — the bottom vent allows propane (which is heavier than air) to escape if a leak occurs, and the top vent allows combustion air to circulate. The Broilmaster Vent Register Kit is the stainless steel matching-pair register accessory for the BSB-series built-in configuration.

The B Series Stainless head is 304 stainless steel construction (or 316 marine-grade on the MG variants). Exact dry shipping weights are not in the BR0227 spec sheet; expect a freight class shipment with palletized delivery. Plan island countertop support around granite/quartz/concrete typical loading — the grill head weight is well within standard outdoor-kitchen counter capacity but the rough opening reduces effective span, so consider counter overhang and unsupported edges around the cutout.