{
  "revision": "P05",
  "date": "2026-10-10",
  "title": "Arrival, airflow and weather study",
  "status": "Design proposals for review; not for permit, tender or construction",
  "cooling_direction": {
    "selection": "Natural airflow with fans",
    "source": "Andre, direct reply in this chat, 10 October 2026 HST",
    "scope": "Working design direction; no fan product, quantity, ventilation performance or construction approval"
  },
  "baseline": {
    "p04_sha256": "c23c293867c87144ebd6f733ad54e3bd93f81fcb5718575a1a45b1ab4e323d6d",
    "enclosure_diameter_m": 25,
    "main_roof_diameter_m": 27,
    "occupant_positions": 103,
    "congregation_positions": 100,
    "lantern_cells": 36,
    "lower_glass_bays": 12,
    "upper_glass": "P04 variable-head proposal retained; no new art-glass deletion"
  },
  "entrance_proposal": {
    "status": "New option for review",
    "canopy_x_min": -3,
    "canopy_x_max": 3,
    "canopy_y_rear": -11.9,
    "canopy_y_front": -16.7,
    "canopy_rear_top_z": 3.3,
    "canopy_front_top_z": 3.05,
    "canopy_plan_area_m2": 28.8,
    "level_arrival_width_m": 4.8,
    "level_arrival_depth_m": 3.6,
    "level_arrival_area_m2": 17.28,
    "main_door_nominal_m": 2.4,
    "approach_clear_reserve_m": 1.8,
    "combined_max_width_m": 27,
    "combined_front_back_m": 30.2,
    "extra_beyond_main_roof_m": 3.2,
    "notes": [
      "Canopy shape and top heights are appearance reserves, not a roof build-up, structural span or underside clearance.",
      "Support locations, foundations, connection, uplift design and roof-to-roof flashing remain unresolved.",
      "Arrival rectangle is a clear-space study, not a surveyed paving boundary or door-clearance certification.",
      "Combined envelope excludes setbacks, accessible route, drainage, maintenance and construction access."
    ]
  },
  "comfort_proposal": {
    "fan_zones": 4,
    "fan_count": null,
    "fan_diameter": null,
    "fan_mount_height": null,
    "airflow_rate": null,
    "zones_note": "Four coverage study areas, not four fans or sized performance circles. No fan supports selected.",
    "dry": "Opposed protected openings and high outlets are proposed; direction is illustrative. Circulation fans supplement movement at seats.",
    "rain": "Close openings exposed to driven rain; use tested protected intake/outlet paths. Powered fresh-air backup is a design allowance to study, not an installed or sized system.",
    "still": "Fans can move room air when wind is weak. If outdoor-air delivery is inadequate, a designed supply/extract system is needed. Comfort must be tested in hot humid conditions.",
    "glass": "New air paths need separate operable panels or opaque-wall zones. Existing art glass is not counted as openable. No glass is removed by this study."
  },
  "sources": [
    {
      "id": "S1",
      "title": "PAGASA - Climate of the Philippines",
      "url": "https://www.pagasa.dost.gov.ph/information/climate-philippines",
      "use": "National hot, humid and rainy climate context only; not local rainfall or wind data."
    },
    {
      "id": "S2",
      "title": "NCDA - 2024 revised BP 344 rules",
      "url": "https://ncda.gov.ph/revised-2024-rules-and-regulations-implementing-batas-pambansa-344/",
      "use": "Early access screening: level routes and 1:20 slope baseline. Full current local review still required."
    },
    {
      "id": "S3",
      "title": "WBDG - Natural ventilation",
      "url": "https://stg.wbdg.org/resources/natural-ventilation",
      "use": "Inlet and outlet paths depend on wind and buoyancy. Site wind and actual opening performance require analysis."
    },
    {
      "id": "S4",
      "title": "US DOE - Energy-saving hacks to beat the summer heat",
      "url": "https://www.energy.gov/indianenergy/articles/energy-saving-hacks-beat-summer-heat",
      "use": "Circulation fans move existing air and help people feel cooler; they do not create cold air."
    }
  ],
  "next_after_location": [
    "Survey parcel and levels; establish buildable footprint and approach",
    "Record obstructions, local wind exposure and drainage outfall",
    "Reconcile access, fire exits, ventilation, structure, rainwater and services",
    "Price complete scope against US$300,000 excluding land; no affordability claim"
  ]
}