Two Chambers, 500 Square Inches, Roto-Draft Damper Control — the Regal Charcoal Offset 400 Brings Classic Offset Smoking to a More Accessible Backyard Footprint
The Regal Charcoal Offset 400 brings a true two-chamber offset design, 500 sq. in. of primary cooking space, heavy-duty cast iron grids, smoke diffusing charcoal trays, and chimney-style Roto-Draft damper control to a 186 lb. charcoal grill and smoker built for traditional live-fire backyard cooking.
The Regal Charcoal Offset 400 is the offset smoker for buyers who want the real thing — fire in the firebox, indirect heat and smoke flowing through the main chamber, authentic low-and-slow barbecue — without needing the full footprint of the Offset 500. At 186 lbs. and 50 inches wide, it's a serious backyard unit that still fits on most patios. Heavy-duty cast iron cooking grids put 500 square inches of primary surface over proper charcoal heat, the dual-purpose smoke diffusing charcoal trays give you more even heat distribution and direct-grill capability in the main chamber, and the chimney-style stack with Roto-Draft damper technology lets you control airflow and temperature precisely throughout a long cook. The removable ash trays in both chambers make cleanup more manageable. A durable front shelf with tool hooks keeps your workspace organized during longer sessions. Two manuals are linked below for both owners guidance and assembly.
Why the Regal Charcoal Offset 400 Belongs on Your Patio
Three things that make this a capable live-fire cooking platform in a more patio-friendly size.
Offset
True Two-Chamber Design
A true offset layout — fire in the firebox, indirect heat and smoke flowing into the main cooking chamber — creates the authentic low-and-slow environment that produces classic smokehouse barbecue flavor.
500 sq. in.
Cast Iron Primary Surface
500 sq. in. of primary cooking space over heavy-duty cast iron grids — enough room for a full rack of ribs or a substantial roast, with the heat retention that cast iron delivers over charcoal.
Roto-Draft
Chimney Stack Damper Control
A chimney-style stack with Roto-Draft damper technology gives you precise airflow control — the key tool for maintaining stable smoking temperatures over a long cook.
What's Included in the Box
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Broil King Regal Charcoal Offset 400
- Regal Charcoal Offset 400 freestanding charcoal grill and smoker
- Heavy-duty cast iron cooking grids
- Two dual-purpose smoke diffusing charcoal trays
- Removable ash trays (in both cooking chambers)
- Durable front shelf with integrated tool hooks
Deep Dive — Regal Charcoal Offset 400
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Traditional offset design for authentic smokehouse-style cooking
The Regal Charcoal Offset 400 is built around a true offset layout with two cooking chambers, giving buyers a more traditional smoking workflow than a standard charcoal grill. This design makes it easier to manage indirect heat and smoke flow for ribs, roasts, and other barbecue favorites while preserving the character of live-fire charcoal cooking.
Heavy-duty charcoal performance with practical airflow control
Broil King equips the Regal Charcoal Offset 400 with dual-purpose smoke diffusing charcoal trays and a chimney-style stack with Roto-Draft damper technology to help users manage airflow and fuel more precisely. That setup supports a wider range of charcoal cooking styles, from hotter direct grilling to steadier low-and-slow smoking sessions.
Cast iron cooking grids and rugged smoker construction
Heavy-duty cast iron cooking grids help deliver stronger heat retention and dependable grilling durability, while the rugged offset body is designed to feel more substantial than lighter backyard smokers. For homeowners building a more capable outdoor cooking setup, the Regal Charcoal Offset 400 offers a more serious live-fire cooking platform.
Convenient backyard features for longer smoking sessions
The Regal Charcoal Offset 400 also includes removable ash trays, a durable front shelf with integrated tool hooks, and an offset layout built for practical backyard use. These details help make longer smoke sessions more manageable and more comfortable for routine charcoal cooking and entertaining.
Who It's For — The Deck & Den Take
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The Regal Charcoal Offset 400 is the right offset smoker for a buyer who wants the full traditional offset experience at a slightly more manageable size. Compared to the Offset 500, you get the same two-chamber design, the same smoke diffusing charcoal trays, the same cast iron cooking grids, and the same charcoal-fired live-fire approach — in a unit that's 6 inches narrower (50" vs. 56") and 53 lbs. lighter (186 vs. 239). That difference matters on a smaller patio or if you're more careful about delivery logistics.
The Roto-Draft chimney stack damper is worth understanding. Unlike a simple sliding vent, the Roto-Draft system is designed to give you more precise and consistent airflow control as you rotate it — which makes temperature management during a long cook more repeatable once you learn the grill's rhythm. Pair it with the smoke diffusing charcoal trays and you have better heat distribution across the main cooking surface than a bare offset firebox provides.
Same honest caveats as any offset smoker: this is a hands-on cooking method. You will manage your fire, add fuel, and work the dampers throughout a cook. If you want set-it-and-forget-it, the Broil King Vertical Gas Smoker is the more practical direction. But if you're drawn to the process and want the flavor that offset charcoal smoking produces — brisket bark, ribs with real smoke rings — the 400 delivers that in a size that fits more backyards than the 500.
- Charcoal smokers who want traditional offset cooking at a slightly smaller and lighter footprint than the Offset 500
- Buyers with a mid-size patio who want a serious charcoal grill and smoker without the full 239 lb. commitment
- Anyone who wants to grill directly in the main chamber as well as smoke using the offset firebox
- Buyers who want the Roto-Draft damper system for more precise airflow control during long cooks
- Live-fire cooking enthusiasts who want authentic smokehouse flavor from a dedicated offset charcoal setup
Full Specifications & Dimensions
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Product Details
| Brand |
Broil King |
| Model |
Regal Charcoal Offset 400 |
| Collection |
Charcoal Grills and Smokers |
| Item Number |
138-955050 |
| Model Number |
955050 |
| Fuel Type |
Charcoal |
| Primary Cooking Surface |
500 sq. in. |
| Total Cooking Space |
830 sq. in. total cooking surface |
| Cooking Chambers |
2 |
| Cooking Grids |
Heavy-duty cast iron |
| Charcoal Trays |
Two dual-purpose smoke diffusing charcoal trays |
| Damper System |
Chimney-style stack with Roto-Draft damper technology |
| Ash Management |
Removable ash trays in both cooking chambers |
| Shelf |
Durable front shelf with integrated tool hooks |
| Assembled Dimensions |
50" W x 26" D x 52.5" H |
| Weight |
186 lbs. |
Warranty, Shipping & Returns
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Warranty: Covered by Broil King's limited manufacturer warranty: 5 years on the high-heat-coated cook box and 2 years on remaining parts and paint. Coverage is limited to the original purchaser for defects under normal domestic use; shipping, removal or reinstallation, labor, and service-call costs are not covered.
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Free Shipping: Available on orders over $100. See full shipping policy.
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Returns: 45-day return window. See full returns policy.
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Price Match: Found it for less? We'll match it. See price match policy.
Manuals & Documents
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Frequently Asked Questions
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How does the offset smoker design work?►
The Regal Charcoal Offset 400 has two separate chambers: a firebox (the smaller offset chamber on the side) where the charcoal fire burns, and a main cooking chamber where food is placed. Heat and smoke travel from the firebox through the main chamber and exit via the chimney stack. This creates an indirect cooking environment — food is never directly over the fire — which produces the low-and-slow conditions needed for traditional barbecue.
Can the Regal Charcoal Offset 400 be used for direct grilling as well as smoking?►
Yes. The smoke diffusing charcoal trays can hold charcoal directly in the main cooking chamber for direct-heat grilling at higher temperatures. This gives the Offset 400 dual capability — direct grilling in the main chamber, or indirect offset smoking with the fire in the firebox.
What is the Roto-Draft damper system on the chimney stack?►
The Roto-Draft damper is a rotary airflow control mechanism on the chimney stack. By rotating the damper, you adjust how much air exits the cooking chamber, which directly controls how quickly the fire burns and how much smoke is retained inside the cooker. Opening the Roto-Draft increases airflow and raises temperature; closing it restricts airflow and drops temperature. It is the primary tool for managing and maintaining a stable smoking temperature during a long cook.
What is the primary cooking surface, and is there a total cooking space figure?►
The primary cooking surface in the main chamber is 500 sq. in. A total cooking space figure including the offset firebox chamber was not provided in the available source materials. Broil King lists 830 sq. in. of total cooking surface, including the 500 sq. in. primary cooking area and the additional cooking surfaces.
What are the smoke diffusing charcoal trays?►
The dual-purpose smoke diffusing charcoal trays are perforated trays positioned inside the cooking chambers. They distribute heat more evenly across the cooking surface when charcoal is placed in the main chamber, and can also hold wood chips or chunks alongside charcoal in the firebox to enhance smoke flavor during indirect smoking cooks.
Does offset charcoal smoking require active fire management?►
Yes. Offset charcoal smoking requires active fire management throughout a cook — monitoring temperature, adding fuel as needed, and adjusting the damper to maintain your target heat level. This is more hands-on than gas or pellet smoking, where temperature is held automatically. Many offset smokers find this process rewarding. If you prefer a more automated approach, the Broil King Vertical Gas Smoker is a better fit.
What are the assembled dimensions and weight?►
The assembled dimensions are 50" W x 26" D x 52.5" H. The Regal Charcoal Offset 400 weighs 186 lbs. Plan your patio space and delivery access before ordering — at this size and weight, this is a permanent backyard installation rather than something you reposition frequently.
Can wood chunks or logs be used in the firebox?►
Yes. The offset firebox is designed to burn charcoal as well as wood chunks. Many traditional offset smokers use a combination of charcoal for heat and wood for smoke flavor, or run on wood alone for a more traditional approach. Wood chips or chunks can also be added to the smoke diffusing trays in the main chamber for additional smoke flavor during indirect cooks.
What warranty does the Regal Charcoal Offset 400 carry?►
The Regal Charcoal Offset 400 is covered by Broil King's limited manufacturer warranty: 5 years on the high-heat-coated cook box and 2 years on remaining parts and paint. Coverage is limited to the original purchaser for defects under normal domestic use. Shipping, removal or reinstallation, labor, and service-call costs are not covered.
How does the Regal Charcoal Offset 400 compare to the Regal Charcoal Offset 500?►
Both use the same two-chamber offset design, dual-purpose smoke diffusing charcoal trays, heavy-duty cast iron cooking grids, and removable ash trays. The key differences: the Offset 400 has 500 sq. in. of primary cooking space vs. 625 sq. in. on the 500; the 400 is 50" wide vs. 56"; and the 400 weighs 186 lbs. vs. 239 lbs. The 400 uses a chimney-style stack with Roto-Draft damper technology; the 500 uses a fully adjustable internal damper. The 500 also includes an Accu-Temp thermometer with chrome bezel, heavy-duty stainless steel door handles, and a bottle opener that are not confirmed in the 400's source specifications.
