Uniformat D3040

Supply or return fan

Also called SF, RF, inline fan, supply fan, return fan

• Confidence C
• Version 0.1.0
• Reviewed 2026-10-21

Service life

Years in service. One stated life so far; the band will widen as sources are added.

Basis

• 15 years · Energy Conservation Program: Energy Conservation Standards for Fans and Blowers (notice of proposed rulemaking), 89 FR 3714, January 19, 2024, p75 · IV.F.6 “Equipment Lifetime: GFBs, "15 years in the commercial sector based on the expected lifetimes of HVAC equipment"” — U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (planning life)
  Printed page 3788. Commercial-sector lifetime for general fans and blowers (all fan types). Proposed rule; the 15 years is borrowed from HVAC equipment lifetimes, not fan data.

How sources are chosen and recorded: sourcing policy.

Preventive maintenance

13 tasks in 3 work orders. Intervals that fall due together are one visit: the annual visit also covers the monthly tasks.

1. 1Monthly
2. 2Monthly
3. 3Monthly
4. 4Monthly
5. 5Monthly
6. 6Monthly
7. 7Monthly
8. 8Monthly
9. 9Monthly
10. 10Monthly
11. 11Monthly
12. 12Annual

Months from the schedule start. Daily and weekly rounds run in between. Download the tasks as CSV for a CMMS, or ask the MCP tool get_pm_schedule for dated visits.

Frequencies are ISO 8601 durations in the data (P3M = every 3 months).

Open questions

• Every source here is a published planning, design or accounting life. None is observed replacement data.

Know the answer? Send it with a source to [email protected].

Cite this

Citation

unfinished.one (2026). Supply or return fan, v0.1.0. https://unfinished.one/c/supply-return-fan/v/0.1.0

BibTeX

@misc{unfinished_supply_return_fan_0_1_0,
  title = {Supply or return fan},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.1.0},
  url = {https://unfinished.one/c/supply-return-fan/v/0.1.0},
  note = {CC BY 4.0}
}

Licence CC BY 4.0 · How to cite · JSON · Versions: 0.1.0