Specialized Ventilation Systems
Equipment exhaust, makeup air solely for that exhaust, and process filtration are treated as following the equipment in several IRS industry matrices. Building restroom and occupancy exhaust stays with the building. The HVAC sole-justification test is a regulation exception, not an electrical load split. Educational information, not tax advice.
Educational information, not tax advice.
Updated 2026-10-14
Key takeaways
- Restaurant equipment exhaust hoods and kitchen-only makeup air are grouped with kitchen equipment in the restaurant matrix.
- Clean-room HEPA and special air handlers are personal property in the pharmaceutical matrix; the clean-room enclosure is building.
- Residential built-in stove hoods are building in the residential rental matrix.
- Allocation of a mixed HVAC unit is not appropriate in the restaurant matrix; do not import electrical functional allocation.
- Hood schedules, makeup-air calculations, and process specifications are the usual file.
Specialized ventilation captures heat, grease, fumes, or particles from a process. It is sized to equipment, not to occupant comfort. Treas. Reg. §1.48-1 still frames the question. Tangible personal property excludes buildings and structural components. A building is a roofed enclosure used for shelter, housing, or working, office, parking, display, or sales space. Structural components include components of a central air-conditioning or heating system and other components relating to the operation or maintenance of a building. Restroom exhaust and general toilet-room fans are occupancy ventilation. A Type I hood over a cook line is process capture on restaurant facts described in the audit guide.
The regulation’s sole-justification exception covers machinery installed because temperature or humidity control is essential to other machinery or to processing materials or foodstuffs. Kitchen makeup air that exists solely to replace air exhausted by equipment hoods is the restaurant-matrix application of a process-only idea. Comfort air that also serves the cook line is not sole justification. Hospital Corp. of America applied the structural-component tests under MACRS; item results were not IRS-acquiesced.
Publication 5653’s restaurant matrix treats equipment exhaust hoods, air makeup solely for kitchen equipment, and dedicated outlets as traveling with food-storage and preparation equipment. The pharmaceutical matrix keeps clean-room walls, floors, and ceilings as building property and treats HEPA filtration, special air handlers, and process vacuum as personal property with an activity-class life. Extra slab thickness alone does not make a foundation personal property. The residential matrix treats built-in stove hoods as residential rental building property. Those are examiner rows for named industries, not a national hood class.
Morrison denied sanitary kitchen walls and floors as structural while allowing some kitchen electrical items. AmeriSouth kept most special HVAC and plumbing with apartments. Courts split because the record either showed a process-only system or showed finishes that made the building usable as a dwelling or cafeteria. Whiteco’s six permanence factors are a court test for inherently permanent structures. A welded exhaust duct may be hard to remove and still be process duct if it exists only for a hood; a toilet exhaust riser is building even if it is also hard to remove. Permanence is not the only test.
Scott Paper functional allocation remains an electrical-distribution method. Publication 5653 Chapter 8.A does not extend it to HVAC or exhaust as an IRS-accepted percentage split. If the same air handler serves dining and the cook line, the restaurant matrix’s no-allocation rule is the examiner view published in the guide. Boddie-Noell separately rejected after-the-fact HVAC percentages that were not tied to contemporaneous records, which is another reason a mixed unit should be described as mixed rather than allocated by kitchen square footage.
Hoods, makeup air, and the cook line
A hood schedule that lists equipment under the canopy, a makeup-air unit interlocked with that exhaust, and photographs of the dedicated duct are the restaurant-matrix fact pattern. Fire-suppression cylinders over the same hood are discussed with fire protection, not automatically with the hood. The matrix focuses on exhaust and makeup air more than on suppression bottles.
Clean rooms and process air
The pharmaceutical matrix separates the enclosure from the special equipment. HEPA, process power, and special air and vacuum lines can be personal property; the box remains building. Applying that split to a hospital isolation room or a data hall is analogy. There is no healthcare or data-center matrix in Publication 5653.
Residential hoods are not restaurant hoods
A built-in apartment stove hood is listed as building in the residential matrix because it is treated as part of the dwelling’s ventilation. Copying the restaurant kitchen-hood row into a multifamily study, or the reverse, is a common mismatch of industry guidance.
Whiteco does not replace the HVAC list
If a taxpayer argues that a rooftop makeup-air unit is personal property because a crane can lift it, Whiteco’s movability question is relevant but not controlling. Design for permanence, expected length of affixation, and the regulation’s central-system list still apply. Rev. Rul. 2003-54 used Whiteco for canopies, not for kitchen fans.
Documentation
Mechanical drawings, hood listings, makeup-air calculations, and process specifications belong in the study file. If a unit serves both occupancy and process, say so; the restaurant matrix’s no-allocation sentence is the examiner view of that mixed unit. Publication 5653 Chapter 4 also wants a legal analysis and a cost reconciliation. Estimating methods named in Chapter 3 are examiner-observed approaches. Super Intelligence extraction is proposed, not claimed as operational. This page is educational information, not tax advice.
Sources
- 1IRS Publication 5653 — Cost Segregation Audit Techniques Guide (rev. 2-2025)(opens in a new tab)
Written for IRS examiners. The guide states it is not an official pronouncement of law and cannot be cited as authority. It predates the July 2025 law.
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