{"id":"smoke-heat-detector","version":"0.1.0","classification":{"uniformat":"D5030"},"names":["Smoke and heat detectors"],"aliases":["smoke detector","heat detector"],"service_life":{"median_years":20,"range_years":[20,20],"range_basis":"source_spread"},"pm_tasks":[{"task":"Test heat detectors with a heat source","frequency":"P2Y","reference":"UFC 3-601-02 Fire Protection Systems Inspection, Testing, and Maintenance (7 October 2021, with Change 1, 18 April 2025)","url":"https://www.wbdg.org/FFC/DOD/UFC/ufc_3_601_02_2021_c1.pdf","page":35,"checklist":"Table 2-1 Fire Detection and Alarm System ITM Tasks"},{"task":"Test smoke detectors with approved smoke simulant","frequency":"P2Y","reference":"UFC 3-601-02 Fire Protection Systems Inspection, Testing, and Maintenance (7 October 2021, with Change 1, 18 April 2025)","url":"https://www.wbdg.org/FFC/DOD/UFC/ufc_3_601_02_2021_c1.pdf","page":35,"checklist":"Table 2-1 Fire Detection and Alarm System ITM Tasks"},{"task":"Test smoke detector sensitivity","frequency":"P5Y","reference":"UFC 3-601-02 Fire Protection Systems Inspection, Testing, and Maintenance (7 October 2021, with Change 1, 18 April 2025)","url":"https://www.wbdg.org/FFC/DOD/UFC/ufc_3_601_02_2021_c1.pdf","page":36,"checklist":"Table 2-1 Fire Detection and Alarm System ITM Tasks"}],"basis":[{"type":"public_document","life_type":"accounting","title":"General depreciation rates (IR265), July 2021","by":"Inland Revenue (Te Tari Taake), New Zealand","url":"https://www.ird.govt.nz/-/media/project/ir/home/documents/forms-and-guides/ir200---ir299/ir265/ir265-2021.pdf","page":43,"code":"BDFO","label":"Heat detectors","years":20,"note":"Printed page 43. BDFO Building fit-out (when in books separately from building cost). Printed DV 10%, SL 7%. Tax depreciation lives set by the Commissioner of Inland Revenue for New Zealand income tax, not engineering or asset-management lives; they are banded and often short (e.g. reticulation piping 25 years). The July 2021 edition was the newest PDF reachable; the online Depreciation Rate Finder may hold later determinations."},{"type":"public_document","life_type":"accounting","title":"General depreciation rates (IR265), July 2021","by":"Inland Revenue (Te Tari Taake), New Zealand","url":"https://www.ird.govt.nz/-/media/project/ir/home/documents/forms-and-guides/ir200---ir299/ir265/ir265-2021.pdf","page":44,"code":"BDFO","label":"Smoke detectors","years":20,"note":"Printed page 44. BDFO Building fit-out (when in books separately from building cost). Printed DV 10%, SL 7%. Tax depreciation lives set by the Commissioner of Inland Revenue for New Zealand income tax, not engineering or asset-management lives; they are banded and often short (e.g. reticulation piping 25 years). The July 2021 edition was the newest PDF reachable; the online Depreciation Rate Finder may hold later determinations."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/smoke-heat-detector","versioned_url":"https://unfinished.one/c/smoke-heat-detector/v/0.1.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Smoke and heat detectors, v0.1.0. https://unfinished.one/c/smoke-heat-detector/v/0.1.0"}