{"id":"humidifier-steam","version":"0.2.0","classification":{"uniformat":"D3040"},"names":["Humidifier, steam"],"aliases":["humidifier"],"service_life":{"median_years":20,"range_years":[20,20],"range_basis":"source_spread"},"pm_tasks":[{"task":"Clean steam humidifier nozzles","frequency":"P1Y","reference":"TM 5-642 Operation and Maintenance: Small Heating Systems","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_642.pdf","page":139,"checklist":"6-38 Humidifiers"}],"basis":[{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":13,"code":"HUD CNA 3.4.3.1.12","label":"Air filtration/humidity control devices (humidifiers, HRV's)","years":20,"note":"Same life for family and elderly properties. US multifamily housing. HUD's row names humidifiers without saying steam."}],"confidence":{"grade":"C","sample_size":null},"open_questions":["Only one source so far: HUD planning lives for US multifamily housing. Canadian and observed sources are needed.","Furnace tasks come from Army TM 5-642 (1990); equipment and practice may have changed since."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-21","canonical_url":"https://unfinished.one/c/humidifier-steam","versioned_url":"https://unfinished.one/c/humidifier-steam/v/0.2.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Humidifier, steam, v0.2.0. https://unfinished.one/c/humidifier-steam/v/0.2.0"}