{"id":"gas-detection","version":"0.5.0","classification":{"uniformat":"D3060"},"names":["Gas detection system"],"aliases":["CO detector","NO2 detection","refrigerant leak detector","gas detector"],"service_life":{"median_years":10,"range_years":[10,10],"range_basis":"source_spread"},"pm_tasks":[],"basis":[{"type":"public_document","life_type":"planning","title":"UFM 3-601-02 Fire Protection Systems Inspection, Testing, and Maintenance (Unified Facilities Manual, 13 March 2026)","by":"U.S. Department of Defense (Unified Facilities Criteria program)","url":"https://www.wbdg.org/FFC/DOD/UFC/ufm_3_601_02_2026.pdf","page":32,"code":"Table 2-1","label":"Fire Detection and Alarm System ITM Tasks, frequency \"10 Years\": \"Carbon Monoxide Detectors\" - \"Replace detectors.\"","years":10,"note":"Printed page 25. CO detectors connected to the building fire alarm system (section 3-4 distinguishes these from single-station CO alarms). Covers the CO detector heads only; NO2, refrigerant and combustible-gas detectors and the gas detection controller are not addressed."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data.","No preventive maintenance tasks are sourced yet."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/gas-detection","versioned_url":"https://unfinished.one/c/gas-detection/v/0.5.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Gas detection system, v0.5.0. https://unfinished.one/c/gas-detection/v/0.5.0"}