Complete Feature Inventory

Revit Clash Detection — BirdTools-Class

Production-grade clash detection rebuilt from the ground up around three pillars: the in-Revit ElementIntersectsSolidFilter (no tessellation step), a BVH broad phase for large federated models, and parallel narrow-phase SAT.

• BirdTools-class architecture — BVH + parallel narrow phase + semantic filters
• Freeze prevention with cooperative batching and Revit-kernel-aware thread guards
• In-Revit ElementIntersectsSolidFilter (host doc + linked docs)
• 3D and 2D view navigation — jump to any clash, isolate, override graphics
• Persistent symbol blacklist — ignore known false positives across runs
• BB-volume reject — skip degenerate or empty solids before SAT
• Real-time clash monitor with 5-second debounce as you model
• Auto-routing for trivial offsets (duct/pipe rerun)
• View colorization — color-by-discipline / by-severity overlays
• Free-text search across the result set

50K×50K elements clash-tested in under 2 minutes on a workstation-class machine.

Path B — ASHRAE 140 6-Patch IRT Solver

Independent thermal engine validated against ASHRAE Standard 140-2017 envelope test suite. Six-patch interior radiation transfer matrix solver couples surfaces via view factors and linearized Stefan-Boltzmann radiative exchange.

• 6-patch interior radiation transfer (IRT) matrix solver
• Surface-to-surface view factors (analytical for Case 600/900 geometry)
• Linearized Stefan-Boltzmann coupling at 70 °F operating point
• Forced-convection h_c boost when fan running
• Per-surface CTF nodes (per-orientation interior surface response)
• True 60/30/10 ASHRAE Heat Balance Method solar split
• Validated against ASHRAE 140 Case 600 and Case 900

Cite: ASHRAE Fundamentals Ch. 18; ASHRAE Standard 140-2017 envelope test cases.

Path A — CBECC Wrap for Title 24 Nonres

Full CBECC-Com wrapper for California Title 24 nonresidential compliance submissions. Handles round-trip translation between JΔS project models and the official CEC ruleset.

• Generates valid .cibd25 XML for direct CEC submission
• 313 round-trip tests pass against real CBECC 2025.2.1 install
• PolyLp + CartesianPt geometry emission per surface
• FluidSegIn/Out hydronic coil topology
• IntWall / IntFlr / ExtFlr / Window emission
• Verbose CBECC-CLI diagnostic mode for bisection
• Validated end-to-end against CBECC's own SchoolSmall and OfficeSmall

Cite: CEC ACM Reference Manual, T24-2025; CBECC ruleset 2025.2.1.

IEEE 1584-2018 Arc Flash

Full Annex D coefficient transcription for the IEEE 1584-2018 nine-variable model. Replaces the legacy 2002 single-coefficient model used by most legacy tools.

• Electrode configuration support — VCB, VCBB, HCB, HOA
• Electrode gap correction
• Enclosure size correction (height, width, depth)
• System voltage range 208 V – 15 kV
• Arcing current and incident energy at working distance
• Arc flash boundary calculation
• NFPA 70E PPE category labels (table-based mapping)
• All 21 IEEE 1584-2018 worked examples pass within ±0.0%

Cite: IEEE Std 1584-2018 Annex D Tables 1, 2, 3, 4, 5, 7. Multi-source verified vs LiaungYip + rwl + Stokes-Phillips reference implementations.

ACCA Manual J 8th Edition

Complete table support for ACCA's residential load calculation methodology — the de facto standard for one- and two-family dwellings.

• Tables 1B (climate design conditions), 3A (window HTM), 3D (skylight HTM)
• Tables 4 / 4A / 4D (wall HTM by construction class)
• Tables 5A / 5B / 5C / 5D (door, partition, basement, slab HTM)
• Table 7E (latent grain difference by climate zone)
• Section 9 calibration applied to internal gain factors
• All 12 ACCA Manual J worked examples pass
• Integrated with engine.py whole-house and room-by-room calc

Cite: ACCA Manual J 8th Edition (2016); Manual S equipment selection.

DOE CRB Cross-Validation

Continuous regression against the DOE Commercial Reference Buildings — 16 prototype buildings × 16 ASHRAE climate zones — the same dataset DOE / PNNL use to score code-change impact.

• SmallOffice, MediumOffice, LargeOffice, StripMall, Warehouse, etc.
• EUI targets within ±5% of DOE published values where multi-zone topology matches
• Single-CZ Chicago strict block (TestDOECRBStrict): all 6 prototypes within ±20%
• Validated against DOE / PNNL code-change-impact tolerance band
• Continuous-integration regression on every commit

Cite: DOE Commercial Reference Buildings (2011, updated). PNNL TR-25770.

Cooling Load Methodology

• Radiant Time Series (RTS) per ASHRAE Fundamentals Ch. 18
• Heat Balance Method (HBM) for transparent comparison
• CLTD/CLF / CLTD-DE for code-required prescriptive paths
• 523 weather locations with TMY3-based design conditions
• Altitude correction on sensible / latent / total load factors
• Per-orientation solar with shade-coefficient and SHGC handling

Heating Load Methodology

• Steady-state heat loss with 99% / 99.6% design temperatures
• Slab-on-grade F-factor and below-grade U-factor per ASHRAE 90.1
• Infiltration via crack method, blower-door, or ACH
• Manual J 8 residential path with full table support
• ASHRAE Ch. 17 commercial path
• Adjacent-space and partition heat loss

Ventilation (ASHRAE 62.1 / 62.2)

• 62.1 ventilation rate procedure (occupancy + area)
• 62.1 IAQ procedure
• System-level Vot calculation with multiple-zone correction
• 62.2 residential whole-house ventilation
• DCV reset based on CO₂ setpoint
• NRCC-MCH-04-E auto-population for Title 24

Psychrometric Engine

• ASHRAE Fundamentals 2021 Ch. 1 Rankine-coefficient saturation
• Specific volume v = 0.370486 · T_R · (1+1.6078W) / p_atm
• Altitude-corrected sensible 1.08, latent 4840 factors
• 7 input combinations (DB+RH, DB+WB, DB+DP, DB+W, etc.)
• Two-point comparison with adiabatic mixing
• Validated to 0.02% on every published ASHRAE example

Title 24 (California)

• T24-2025 nonresidential and residential compliance
• Path A: CBECC-Com wrap for direct CEC submission
• NRCC, LMCC, NRCI form auto-population
• Mandatory measures, prescriptive, and performance paths
• TDV (time-dependent valuation) energy
• 16 California climate zones

ASHRAE 90.1 / Appendix G

• ASHRAE 90.1-2022 prescriptive and performance
• Appendix G PRM with 4-rotation baseline
• Energy Cost Budget (ECB) method
• Unmet hours tracking from 8760 simulation
• 5-zone trapezoid PRM clipping
• Climate Zone 0A through 8

IECC 2024

• IECC 2024 commercial and residential
• R-value, U-factor prescriptive compliance
• Total UA tradeoff method
• Mass wall, framed, and metal-building envelope tables
• Equipment efficiency tables 6.8.1-1 through 6.8.1-15

Federal & International

• UFC 3-410-01 / DOD energy compliance
• UFGS / MasterSpec specification editor
• BS 5925 / CIBSE Guide A (UK)
• AS/NZS 1668.2 (Australia / New Zealand)
• NECB (Canada)
• PHIUS / Passivhaus pre-screen

Codes Supported

• IPC 2024 / IPC 2021 (International Plumbing Code)
• UPC 2021 (Uniform Plumbing Code)
• CPC 2022 (California Plumbing Code)
• 28 fixture types with CWFU / HWFU / WSFU / DFU
• 8 building presets (office, school, retail, hospital, etc.)

Calculations

• Hunter's Curve interpolation with extrapolation cap
• Water supply pipe sizing with friction loss
• DWV drainage stack and branch sizing
• DHW recirculation pump sizing
• Gas piping (NFPA 54 longest-length method)
• Storm drainage rainfall intensity by location
• Revit JSON fixture import

Central Plant

• Chillers with AHRI 550/590 correction factors
• Boilers with ANSI Z21.13 altitude derate
• Cooling towers (Merkel + Poppe methods)
• Chilled water and condenser water pumps
• Hazen-Williams and Darcy-Weisbach pipe sizing
• Glycol property correction (40% concentration validated)

Air-Side Equipment

• RTUs with AHRI 340/360 correction
• VAV terminal box selection
• Heat pumps with full derating curve
• Energy recovery wheels (sensible / latent / total)
• Air-handling unit coil rating (cooling, heating, preheat)
• Manufacturer catalogs — Greenheck, Trane, Carrier, JCI

Duct & Pipe Sizing

• Round, rectangular, and SMACNA flat-oval ducts
• Equal-friction, static-regain, and balanced-pressure
• Darcy-Weisbach with Colebrook-White iteration
• Pipe sizing per ASHRAE Fundamentals Ch. 22
• Fitting equivalent length tables

Specialty

• Datacenter cooling (CRAC / CRAH / liquid cooling)
• Cleanroom (ISO 14644-1 ACH)
• Healthcare (ASHRAE 170, ASHRAE 15)
• Lab fume hoods and exhaust
• Pool and natatorium dehumidification
• Walk-in refrigeration

Independent Engine (Path B)

• Native 8760-hour simulation in Python (no EnergyPlus required)
• ASHRAE Heat Balance Method with per-surface CTF
• 5-node interior heat balance with floor interior surface
• Surface-to-surface radiant network (view-factor-based)
• True 60/30/10 HBM solar split
• TMY3 / EPW weather support (523 US + international)

EnergyPlus Bundle (Optional)

• EnergyPlus 24.x bundled (283 MB optional install)
• Native IDF generation from project model
• Subprocess execution with ESO / SQL output parsing
• Side-by-side cross-validation against Path B
• Used for ASHRAE 140 oracle truth in CI

Suppression

• NFPA 13 sprinkler system hydraulics
• NFPA 14 standpipe with proper schedule-40 IDs
• NFPA 20 fire pump (with proper jockey pressure logic)
• NFPA 24 underground water mains
• NFPA 2001 clean agent (proper altitude correction)
• FM 200 / Novec / CO₂ total flooding

Detection & Alarm

• NFPA 72 fire alarm system design
• Smoke detector spacing (Table 17.6.3.5.1)
• Heat detector spacing
• Strobe candela calculation (Table 18.5.5.5.2)
• Speaker SPL calculation
• Mass notification interface

Smoke Control

• NFPA 92 plume method with virtual origin
• Pressurized-stair design
• Atrium smoke exhaust
• Door-opening force (full NFPA 92 form)

Egress & Code

• IBC Chapter 10 egress capacity
• Travel distance per occupancy (correct H/I/F-2)
• Single-exit eligibility
• NFPA 101 atrium and high-rise

Power

• Service and feeder sizing (NEC Article 220)
• Voltage drop with NEC Chapter 9 Table 9 impedance
• Cable sizing with ampacity derating (NEC 310.15)
• Short-circuit calculation (point-to-point method)
• Selective coordination
• Grounding (NEC Article 250)

Arc Flash & Safety

• IEEE 1584-2018 nine-variable model (full Annex D)
• Electrode configuration: VCB / VCBB / HCB / HOA
• Incident energy at working distance
• Arc flash boundary
• NFPA 70E PPE category labels
• All 21 IEEE 1584-2018 worked examples pass

Generation & UPS

• Generator sizing with motor starting kVA
• UPS sizing with crest factor
• Transfer switch ATS
• Power factor correction
• Transformer sizing with proper acos clamp

Lighting & PV

• Photometric point-by-point (LLF accounting correct)
• Lumen method with CU table (capped ≤ 1.0)
• Title 24 Part 6 LPD compliance
• EV charging station sizing (per-charger breaker)
• Solar PV sizing and inverter selection
• Battery energy storage with altitude correction

Design Suite for Revit

• Live bidirectional sync (WebSocket)
• Import spaces, walls, windows with U-values
• Run HVAC load calcs in-place
• Push results back to Revit parameters
• Energy analysis and compliance from inside Revit
• Revit 2022 — 2025 supported

Clash Detection for Revit

• BVH broad phase + parallel narrow phase
• Multi-target sets (host + N linked models)
• Real-time clash monitor with debounce
• Persistent symbol blacklist
• 3D / 2D view jump-to-clash
• View colorization by discipline
• Free-text result search
• Saved test library with JSON persistence

MEP Tools for Revit

• Auto-routing for trivial offsets
• AutoInsulation (replaces RevitAutoInsulation)
• TagSnap for batch tagging (replaces TagSnap45)
• Sheet link diff preview + ElementId round-trip
• Schedule generation and formatting
• Batch parameter editing

AutoCAD Plugin

• Import block layouts with room data
• Push duct / pipe sizing back as labeled blocks
• Equipment schedule generation
• AutoCAD 2022 — 2025 supported

Document Workflows

• RFI generation, tracking, and response
• Submittal review with markup
• Punchlist tracking with photo attachments
• Daily construction log
• Transmittal log with delivery confirmations
• Specification editor (UFGS / MasterSpec)

Field & Coordination

• Field survey PWA (offline-capable)
• Commissioning manager
• Project schedule integration
• Alternative comparison & value engineering
• Life-cycle cost analysis (25-year)
• Carbon footprint (embodied + operational)

Cloud Providers

• Google Gemini (free tier supported)
• Anthropic Claude (API key required)
• OpenAI GPT (API key required)
• Setup wizard at first launch
• Per-tool provider override

Proactive Engineer

• Auto-generates equipment schedules from load calcs
• Drafts control sequences of operation
• Validates inputs against ASHRAE / NFPA / NEC
• Flags physical impossibilities
• AI-assisted report narrative generation