LOCKED design intent materially de-risked from prior ๐Ÿ”ด (Round 2 rebuttal)

LDD-07 ยท Cooking + Island Ventilation

One-line intent

High-performance cooking with induction + removable BBQ plates, an air-curtain plume containment plane, an oversized recessed ceiling capture field, a remote quiet exhaust blower, and a diffused luminous light panel disguising the mechanical function โ€” all instead of a hanging hood.

Design intent ยท AI render

FPO ยท AI render AI-rendered interior detail of the kitchen island at evening with the warm white-oak island and matte-black induction cooktop in the foreground, a removable cast iron Korean BBQ plate centered on the bridge zone glowing faintly at edges, a clean linear air-curtain slot in the island front edge, directly overhead at 8 feet AFF a recessed luminous ceiling capture field reading as a glowing rectangular light panel with a continuous perimeter slot intake, NO hanging hood visible, dark-bronze trim throughout, warm 2700K domestic light
Cooking system intent render โ€” the "magic trick" view: induction cooktop with Korean BBQ plate, air-curtain slot at counter front, overhead a luminous ceiling panel that hides the capture field. No hanging hood. For Position Only: AI-generated from the prompt below. Click to enlarge.
Codex prompt & how to regenerate

To regenerate: hand the prompt below to Codex / ChatGPT with image generation enabled (or any gpt-image-1 / DALL-E 3 endpoint), save the result as site/diagrams/07-cooking-vent-fpo.png, redeploy. Page picks it up automatically.

Recommended params: model gpt-image-1, aspect 16:9, size 1536 ร— 1024.

Prompt:

Architectural interior rendering of a Korean-BBQ-capable induction-cooktop kitchen island in a luxury pre-engineered metal building (PEMB) barndominium living wing, looking diagonally across the island toward the cooking surface with the ceiling capture field directly overhead. Wide-angle photoreal view, captured in warm evening domestic light with the cooking surface and overhead light panel both active. 16:9 aspect. No people in frame. The "no hanging hood" discipline is the visual punchline.

Spatial hierarchy. The frame is anchored by the kitchen island in the lower-center, with the polished hardwood floor underfoot, the dark-bronze-jacketed HVAC trunk just visible at the upper edge of frame running N-S overhead, and the ceiling capture field as the geometric focal point at the top-center of the composition.

Kitchen island (the lower hero element). A warm white-oak millwork island, ~10' long ร— ~3' deep ร— 36" tall, with a polished light-warm stone or concrete-look countertop. The cooktop surface is centered on the island โ€” a flush-mount induction cooktop in matte black glass, ~36" wide, divided into two zones: a center bridge-zone with a removable cast-iron Korean BBQ grill plate sitting on it (the plate is dark, slightly heat-radiating in a subtle deep-orange glow at the edges, NOT bright red), and an east-side traditional 4-burner zone (induction zones glowing faintly at low heat).

Air curtain (subtle, not the subject). A clean linear slot integrated into the front edge of the island countertop, ~2" wide, dark-bronze trim โ€” a barely-visible architectural detail. A subtle upward-rising shimmer of air is suggested but NOT rendered as cartoon arrows or visible smoke streamers โ€” the air curtain is a containment plane, not a visible feature.

Ceiling capture field (the upper hero element). Directly overhead at 8' AFF (~4'-6" above the cooking surface), the ceiling capture field reads as a single elegant luminous panel โ€” roughly 4' ร— 6' rectangular, recessed ~2" into the ceiling plane with a clean dark-bronze trim around the perimeter. The central area glows warm-white (2700K, 90+ CRI) like an architectural light fixture. Around the perimeter of the light panel, a continuous slot intake (~1.5" wide) reads as a clean dark architectural reveal โ€” the exhaust intake, but visually it reads as a shadow gap around the luminous panel. The slot is the only visible exhaust feature; there is NO hanging hood, NO downdraft, NO visible ductwork in the kitchen view.

The magic trick. From this angle the viewer sees: a normal induction cooktop, a normal Korean BBQ plate, a normal warm domestic kitchen, and a beautiful glowing rectangular light panel directly overhead. The ventilation system is entirely hidden in the ceiling plane and inside the 18" floor cavity above. The plume from the cooking surface rises naturally into the perimeter slot intake around the light panel โ€” subtle wisps suggested but NOT cartoonish smoke streamers.

Remote blower indication (subtle context). Just barely visible at the far east edge of frame (upper right), a glimpse of dark-bronze ductwork heading east toward the exterior wall โ€” the remote-blower routing through the floor cavity. NOT the subject โ€” just confirmation that the exhaust goes somewhere.

Surrounding kitchen. Warm white-oak millwork cabinetry visible around the island. Polished light-warm hardwood floor. Subtle dark-bronze pendant fixtures over the breakfast nook glimpsed at the left edge of frame. Glimpse of the spine-wall glazing at the right edge of frame, showing a calm warm-lit interior beyond. The mood is domestic-luxury, warm, evening-after-work.

Lighting mood. Warm domestic evening. Primary light source: the ceiling capture-field light panel itself glowing warm-white over the cooktop. Secondary: pendant fixtures over the breakfast nook, wall sconces along the millwork, subtle low-level under-counter glow. The induction cooktop's bridge zone glows faintly orange from the heated Korean BBQ plate, but the heat radiation is restrained โ€” not a dramatic fireball.

Material palette. Warm white-oak millwork, light-warm polished hardwood floor, matte black induction cooktop glass, cast-iron-dark Korean BBQ plate, polished light-warm stone or concrete countertop, dark-bronze trim throughout (air-curtain slot, ceiling light-panel frame, slot-intake reveal, HVAC trunk jacket), warm 2700K LED lighting. No bright colors. No stainless steel hood. No commercial-grade kitchen aesthetics.

What this is NOT (critical). Do NOT render as: a commercial kitchen, a restaurant cook line, a residential kitchen catalog photo, a stainless-hood appliance brochure, an exposed-duct industrial-loft kitchen, a Korean BBQ restaurant interior, or a Wolf/Subzero showroom. NO hanging hood. NO stainless steel hood canopy. NO downdraft vent. NO visible exhaust ductwork in the kitchen view. NO cartoonish smoke streamers or arrows showing airflow. NO commercial-grade backsplash. NO open flame (it's induction). NO greasy splatter on surfaces. NO restaurant-style heat lamps.

Style direction. Professional architectural visualization, photoreal, evenly exposed. Calm, warm, domestic โ€” the moment when a serious cook can do serious cooking without the kitchen reading as a restaurant. Neutral camera at counter-edge height (~3'-4' AFF for a diagonal upward view that captures both the cooktop and the ceiling panel together), wide angle equivalent to ~24mm full-frame. Sharp focus throughout, no shallow DOF. Should feel like a Dwell magazine cover on "the disappearing kitchen hood," not an appliance brochure.

Why this matters

The single most ambitious piece of the project and the highest-performance-risk item in the LDD set. Visual goal is correct (no hanging hood); engineering bar is higher than the LDD currently acknowledges.

Cooking layout

ZoneSystemUse
Center (cook-biased)Bridge-zone induction + removable platesKorean BBQ ยท teppanyaki ยท griddle
East4-burner inductionPots, pans, everyday

Ventilation strategy (locked design intent)

Open items (large)

Cost drivers (revised after builder rebuttal โ€” earlier $50-100K reflected commercial-kitchen framing)

Stainless duct in 18" floor cavity $2โ€“5K ยท Local-fab stainless intake box w/ baffle filters $2โ€“4K + filters $0.3โ€“0.8K ยท 1,500 CFM remote blower (off-the-shelf) $1.5โ€“3K ยท Air curtain $3โ€“8K ยท Diffused light panel $2โ€“6K ยท ERV interlock controls $0.5โ€“1.5K ยท Architecturally integrated ceiling feature finish $5โ€“10K ยท Induction cooktop + plates $6โ€“14K. Total: $25โ€“40K integration + $6โ€“14K cooktop = $31โ€“54K (down from $50-100K).

Removed: dedicated tempered MUA ($3โ€“12K โ€” replaced by ERV boost interlock), custom plenum ($15โ€“30K โ€” replaced by stainless duct in 18" cavity), hood specialist consultant ($3โ€“8K โ€” UL-listed residential doesn't need Type I engineering).

One downstream shift: ERV upsized to higher-spec unit (~$5โ€“10K vs $3โ€“5K) to absorb boost-mode kitchen MUA. Net savings ~$10K vs original.

Builder's response (Round 2, largely accepted)

  • Cost basis โ€” $50โ€“100K reflected commercial-hospitality framing; UL-listed residential R-3 with off-the-shelf components + 18" floor cavity as duct chase = ~$25โ€“40K integration. Accepted.
  • Induction vs gas plume โ€” induction generates 30โ€“40% less thermal plume than open flame; capture at 8' AFF is solid for residential. Accepted.
  • Stainless duct in 18" cavity (cavity = chase, not plenum) โ€” clean, cleanable, fire-safe. Accepted.
  • All-electric ERV interlock for MUA โ€” zero CO backdraft risk in all-electric envelope. Accepted (with ERV boost-mode sizing called out in LDD-05).
  • Type I commercial classification โ€” UL-listed residential induction in R-3 with intermittent use almost certainly classified residential. Downgraded.

Round 3 follow-up (Peter, 2026-05-15 PM, via David) โ€” concession

"The Korean BBQ is just the optionality / functionality I want for the standard induction cooktop. I feel like Claude is jacking off on this in a crazy way."

Peter is right. Conceded further. A cast-iron Korean BBQ plate sitting on a UL-listed residential induction cooktop is mechanically + electrically identical to a teppanyaki plate on a Wolf E36IS. Type I commercial classification applies to open-flame gas commercial ranges, charbroilers, and continuous-duty restaurant cooking โ€” none of which describe a private R-3 residence with intermittent use. The probability of any DE AHJ reclassifying this is effectively zero.

The "DO NOT order steel until AHJ signs off" framing was overcautious. Replaced with normal permitting hygiene: include a one-line note in the permit submission describing the cooktop as residential UL-listed induction with removable accessory plates. Risk register R16 closed.

Air-gap concerns (this LDD has the most concentrated risk)

  1. Korean BBQ generates serious grease aerosol, not just smoke. Recessed plenum needs grease catchment + drip pan + cleaning access.
  2. Air curtain is a 5โ€“10% performance trick, not 50%. Don't treat as load-bearing.
  3. 8' AFF capture height is reasonable, with caveats (revised). At 4'-6" above cooktop with an oversized recessed field, capture efficiency for high-smoke cooking is plausibly 65โ€“80%. For Korean BBQ, the air-curtain + oversized field + remote blower combination still needs real CFM design.
  4. No mention of grease classification. Code may classify as Type I commercial appliance.
  5. Make-up air at 1,200+ CFM in tight envelope is a major item. Tempered MUA recommended.
  6. Performance failure mode is invisible until move-in. Build a mockup before signoff.
  7. Service access for filters/plenum must be specified, not "preferred."

Cross-references

โ†’ Outputs to

LDD-06 make-up air ยท LDD-12 ceilings exception ยท LDD-20 counter integration ยท LDD-08 light panel

โ† Inputs from

vent section diagram

Diagram

Island cooking section โ€” vertical cut through the kitchen island showing matte black induction cooktop with removable Korean BBQ plate, air-curtain slot at island front edge, plume rising into recessed ceiling capture field at 8 feet AFF, continuous perimeter slot intake around central luminous light panel, exhaust ducted east through the 18-inch floor cavity to a remote inline blower near the east exterior wall
Kitchen plan + section through the island โ€” induction cooktop with Korean BBQ bridge zone, air-curtain slot, overhead luminous ceiling capture field at 8' AFF, exhaust ducted east through the 18" floor cavity to a remote inline blower. Layer-2 CAD from cad/source/07-cooking-vent.py. Click to enlarge.