# unfinished.one > The open reference library for built assets: service life and preventive maintenance for building components. Licence CC BY 4.0. Every entry has a permanent versioned URL, a confidence grade and published open questions. The site is a pre-release; some values are placeholders. Confidence grades: - A: Observed replacements, sample of 50 or more. - B: Three or more independent published sources agree within 20%. - C: One or two published sources. - D: Estimate by named editors only. When you use a value, show the user its canonical_url and confidence grade, and cite the versioned_url. - JSON: https://unfinished.one/api/components.json and https://unfinished.one/api/c/.json - MCP server: https://mcp.unfinished.one/mcp - Contact and corrections: hello@unfinished.one ## Pages - [About](https://unfinished.one/about): what the library is, confidence grades, neutrality, pre-release status - [Sourcing](https://unfinished.one/sourcing): sourcing and provenance policy (draft, pending legal review) - [Cite](https://unfinished.one/cite): version links, citation format, BibTeX, CC BY 4.0 attribution - [Agents](https://unfinished.one/agents): connecting the MCP server, JSON API URLs - [Municipal plans](https://unfinished.one/plans): index of Ontario municipal asset management plans (no extracted values published yet) ## Components - [Rooftop unit, gas heat / DX cooling](https://unfinished.one/c/rtu-gas-electric): median 15 years, confidence D ## Planned, not written yet These 99 components are in the v1 catalogue but have no entry and no values. Do not cite them for numbers; map_classification on the MCP server returns entry_published: false for them. - Rooftop heat pump unit (rtu-heat-pump, Uniformat D3050) - Make-up air unit (make-up-air-unit, Uniformat D3040) - Air handling unit, indoor (ahu-indoor, Uniformat D3040) - Energy or heat recovery ventilator (energy-recovery-ventilator, Uniformat D3040) - Boiler, hot water, condensing (boiler-hw-condensing, Uniformat D3020) - Boiler, hot water, non-condensing (boiler-hw-noncondensing, Uniformat D3020) - Boiler, steam (boiler-steam, Uniformat D3020) - Furnace, gas-fired (furnace-gas, Uniformat D3020) - Chiller, air-cooled (chiller-air-cooled, Uniformat D3030) - Chiller, water-cooled (chiller-water-cooled, Uniformat D3030) - Cooling tower (cooling-tower, Uniformat D3030) - Condensing unit, split system (condensing-unit, Uniformat D3030) - Fan coil unit (fan-coil, Uniformat D3050) - Unit heater, gas-fired (unit-heater-gas, Uniformat D3050) - Unit heater, hydronic (unit-heater-hydronic, Uniformat D3050) - Infrared heater, gas-fired (infrared-heater-gas, Uniformat D3050) - Ductless mini-split heat pump (ductless-split, Uniformat D3050) - Water-source heat pump (water-source-heat-pump, Uniformat D3050) - VAV terminal unit (vav-box, Uniformat D3040) - Exhaust fan (exhaust-fan, Uniformat D3040) - Supply or return fan (supply-return-fan, Uniformat D3040) - Pump, inline circulator (pump-inline-circulator, Uniformat D3040) - Pump, base-mounted end suction (pump-base-mounted, Uniformat D3040) - Variable frequency drive (vfd, Uniformat D3040) - Expansion tank (expansion-tank, Uniformat D3040) - Plate heat exchanger (heat-exchanger-plate, Uniformat D3040) - Hydronic baseboard radiation (baseboard-hydronic, Uniformat D3050) - Humidifier, steam (humidifier-steam, Uniformat D3040) - Computer room air conditioner (crac-unit, Uniformat D3050) - Building automation supervisory controller (bas-supervisory-controller, Uniformat D3060) - Unitary or field DDC controller (ddc-field-controller, Uniformat D3060) - Thermostat (thermostat, Uniformat D3060) - Temperature sensor (sensor-temperature, Uniformat D3060) - CO2 sensor (sensor-co2, Uniformat D3060) - Pressure or flow sensor (sensor-pressure-flow, Uniformat D3060) - Damper actuator (damper-actuator, Uniformat D3060) - Control valve with actuator (control-valve, Uniformat D3060) - Motorized damper (damper-motorized, Uniformat D3060) - Gas detection system (gas-detection, Uniformat D3060) - Water heater, gas, storage tank (water-heater-gas-tank, Uniformat D2020) - Water heater, electric, storage tank (water-heater-electric-tank, Uniformat D2020) - Water heater, tankless gas (water-heater-tankless, Uniformat D2020) - Backflow preventer (backflow-preventer, Uniformat D2020) - Domestic hot water recirculation pump (dhw-recirculation-pump, Uniformat D2020) - Domestic water booster pump (booster-pump, Uniformat D2020) - Sump pump (sump-pump, Uniformat D2040) - Sewage ejector pump (sewage-ejector, Uniformat D2030) - Water closet (water-closet, Uniformat D2010) - Lavatory and faucet (lavatory, Uniformat D2010) - Urinal (urinal, Uniformat D2010) - Drinking fountain or bottle filler (drinking-fountain, Uniformat D2010) - Switchgear, low voltage (switchgear-lv, Uniformat D5010) - Panelboard (panelboard, Uniformat D5010) - Transformer, dry-type (transformer-dry, Uniformat D5010) - Transformer, pad-mounted liquid-filled (transformer-pad-mounted, Uniformat D5010) - Motor control centre (mcc, Uniformat D5010) - Automatic transfer switch (ats, Uniformat D5090) - Generator, diesel standby (generator-diesel, Uniformat D5090) - Generator, natural gas standby (generator-natural-gas, Uniformat D5090) - Uninterruptible power supply (ups, Uniformat D5090) - Interior lighting, LED (lighting-led-interior, Uniformat D5020) - Interior lighting, fluorescent (lighting-fluorescent, Uniformat D5020) - Exterior and site lighting, LED (lighting-exterior-led, Uniformat D5020) - Emergency lighting unit (emergency-lighting, Uniformat D5090) - Exit sign (exit-sign, Uniformat D5090) - Sprinkler system, wet pipe (sprinkler-wet, Uniformat D4010) - Sprinkler system, dry pipe (sprinkler-dry, Uniformat D4010) - Fire pump (fire-pump, Uniformat D4010) - Fire alarm control panel (fire-alarm-panel, Uniformat D5030) - Smoke and heat detectors (smoke-heat-detector, Uniformat D5030) - Portable fire extinguisher (fire-extinguisher, Uniformat D4030) - Kitchen hood fire suppression (kitchen-hood-suppression, Uniformat D4090) - Standpipe and hose system (standpipe, Uniformat D4020) - Roof, modified bitumen (roof-modified-bitumen, Uniformat B3010) - Roof, built-up (roof-built-up, Uniformat B3010) - Roof, EPDM single-ply (roof-epdm, Uniformat B3010) - Roof, TPO or PVC single-ply (roof-tpo-pvc, Uniformat B3010) - Roof, metal standing seam (roof-metal, Uniformat B3010) - Roof, asphalt shingles (roof-asphalt-shingle, Uniformat B3010) - Window, aluminum frame (window-aluminum, Uniformat B2020) - Window, vinyl frame (window-vinyl, Uniformat B2020) - Curtain wall glazing (curtain-wall, Uniformat B2020) - Exterior door, hollow metal (door-exterior-hollow-metal, Uniformat B2030) - Overhead door, sectional (door-overhead, Uniformat B2030) - Automatic entrance door (door-automatic, Uniformat B2030) - Elevator, hydraulic (elevator-hydraulic, Uniformat D1010) - Elevator, traction (elevator-traction, Uniformat D1010) - Vertical platform lift (platform-lift, Uniformat D1010) - Escalator (escalator, Uniformat D1020) - Ice plant compressor (ice-plant-compressor, Uniformat D3030) - Ice plant brine chiller (ice-plant-brine-chiller, Uniformat D3030) - Brine pump (brine-pump, Uniformat D3040) - Evaporative condenser (evaporative-condenser, Uniformat D3030) - Arena dehumidifier (arena-dehumidifier, Uniformat D3090) - Ice resurfacer (ice-resurfacer, Uniformat E1090) - Pool filter, sand (pool-sand-filter, Uniformat F1040) - Pool circulation pump (pool-circulation-pump, Uniformat F1040) - Pool chemical controller (pool-chemical-controller, Uniformat F1040) - Natatorium dehumidification unit (pool-dehumidifier, Uniformat D3090)