LDD-06 · Living Wing HVAC Distribution

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/06-living-hvac-fpo.png, redeploy. Page picks it up automatically.

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

Prompt:

Architectural interior rendering of the living-wing of a luxury pre-engineered metal building (PEMB) barndominium, looking north up the living wing with the exposed-ceiling HVAC distribution system as the visual organizing element overhead. Wide-angle photoreal view from kitchen-counter height looking through the living/dining/breakfast/kitchen progression toward the north end. 16:9 aspect. No people in frame. The mood is "the system is the architecture."

Spatial hierarchy. The living wing is ~30' wide × 60' long, single-story double-height (the upstairs is set back; this view is up the open living wing length). The exposed dark-charcoal PEMB ceiling structure is visible overhead. Below it, the HVAC distribution reads as a calm, deliberate composition.

Main trunk (the hero element). A single ~14" round, pre-insulated main trunk runs N-S overhead, centered approximately ~12' off the spine wall (visible at right edge of frame as a glimpse of dark-bronze mullion glazing). The trunk is wrapped in a matte dark-bronze metal jacket so it reads architecturally — NOT shiny silver galvanized, NOT exposed insulation, NOT spray-foamed flex. The trunk uses long-radius elbows where any direction change occurs.

E-W branches (the disciplined grid). Five perpendicular E-W primary branches drop from the trunk at orderly intervals (one branch every ~12'), running directly east-west, each terminating at a discreet linear slot diffuser integrated into the ceiling plane. Smooth wye takeoffs at every branch junction (NO hard 90° taps — the geometry reads as flowing, not bracketed). Each branch is also dark-bronze jacketed to match the trunk.

Linear slot diffusers. Each branch ends in a linear slot diffuser, ~6"–8" long, dark-bronze frame, integrated into the ceiling plane so the slot reads as a clean architectural line rather than a residential register grille. The diffusers are placed away from seating positions, the kitchen island, the breakfast nook, and the entry path — they sit between functional zones, supplying perimeter circulation.

Return air. A single high return grille visible in the central ceiling area, dark-bronze frame, restrained — aligned with the trunk centerline.

Living-wing program below (compositional context, not the subject). Glimpses of the program below: a warm white-oak kitchen island with induction cooktop (no hanging hood — see LDD-07 for the ceiling-integrated capture field, which is just barely visible up-frame as a recessed luminous panel), a Murphy-bed alcove at the far north end, a breakfast nook with bench seating, a TV / lounge zone. Warm white-oak millwork dominates the lower zone. Polished light-warm hardwood floor underfoot.

Lighting mood. Late afternoon. Soft cool ambient daylight from the spine wall glazing on the right, warm domestic glow from kitchen pendants and wall sconces casting warm pools across the white-oak millwork. The ceiling/trunk plane is in calm even light — readable as architectural composition, not industrial utility.

Material palette. Dark charcoal PEMB structure overhead, matte dark-bronze ductwork jackets and diffuser frames, matte medium warm-gray ceiling plane between structural members, warm white-oak millwork and island, light-warm polished hardwood floor, restrained dark-bronze pendant fixtures, soft warm 2700K LED lighting. No bright colors. No exposed shiny galvanized duct. No flex duct visible anywhere. No commercial-grade square ceiling diffusers.

What this is NOT (critical). Do NOT render as: a residential HVAC catalog photograph, an exposed-duct industrial-loft conversion (the trunk is restrained and architectural, NOT the loft-warehouse "exposed silver duct" cliché), a commercial restaurant or office ceiling, a Pinterest "exposed duct living room" snapshot. NO shiny galvanized sheet-metal duct. NO exposed insulation wrap. NO flex duct. NO Christmas-tree-of-pendants chandelier. NO grid tile ceiling. NO floating arrows or annotations.

Style direction. Professional architectural visualization, photoreal, evenly exposed. Calm and considered. Neutral camera at counter height (~3'-4' AFF for an upward-biased view that emphasizes the ceiling composition), looking N up the living wing, wide angle equivalent to ~24mm full-frame, showing both the program below and the trunk-and-branches composition above. Sharp focus throughout, no shallow DOF. Should feel like an architecture-magazine spread on "the discipline of a calm ceiling," not a mechanical-contractor reference photo.