Is surgical air cleaner than medical air?

No. HTM 02-01 applies the same acceptance limits to both; surgical air differs in pressure and flow.

Can surgical air feed dental equipment?

HTM 02-01 allows surgical air to be extended to dental departments through a duplex pressure-reducing station at 600 kPa, after assessing the extra demand on the system.

Medical air vs surgical air: what is the difference?

Q: Medical air vs surgical air: what is the difference?

Medical air and surgical air are the same pharmacopoeia-quality air delivered at different pressures: medical air at 400 kPa for ventilators and other respiratory uses, and surgical air at 700 kPa or more to drive air-powered surgical tools, according to HTM 02-01.

HTM 02-01 (2026), the NHS England guidance for medical gas pipeline systems, says air should be provided at two different pressures but to the same standard defined in the British Pharmacopoeia monographs. Its acceptance criteria for medical air and surgical air are identical: oxygen 20.9% ± 0.5%, carbon monoxide ≤ 5 ppm, carbon dioxide ≤ 500 ppm, sulphur dioxide ≤ 1 ppm, nitrogen oxides ≤ 2 ppm, water vapour ≤ 67 vpm and oil ≤ 0.1 mg/m³. What differs is pressure, flow and use.

Side by side

	Medical air	Surgical air
Pressure (HTM 02-01)	400 kPa	700 kPa or higher; at least 700 kPa at each terminal unit at 350 L/min; static maximum 900 kPa
Pressure (ACSS ET 03/2006, Portugal)	450 kPa ±100 on secondary networks	8 bar +2/−1 for surgical instruments, per ISO 7396-1
Typical flow	Ventilators up to 80 L/min, used continuously	Surgical tools 200 to 350 L/min, for minutes at a time
Typical users	Ventilators, CPAP, BiPAP, NIV, gas mixers, nebulisers	Air-powered surgical tools; ophthalmic equipment at 100 L/min
Particle test flow (HTM 02-01)	150 L/min for 30 s	350 L/min for 30 s
HTM shorthand	MA4	SA7

One plant or two?

HTM 02-01 recommends providing medical and surgical air from a single combined system to reduce maintenance and overall energy consumption, and says a dual-purpose plant incorporating variable speed drives represents the most sustainable and efficient solution. In its combined plant example (Table 19), the secondary supply is two automatic manifolds, one for medical air and one for surgical air.

HTM 02-01 notes that surgical air use is declining as battery and electrically powered tools are introduced, and leaves the need for surgical air to be decided in each design. In Portugal, ACSS ET 03/2006, citing FD S 90-155, allows a 700 kPa medical air outlet to be left out only with written approval from the clinical area that pneumatic equipment will be replaced by an electric tool. Where surgical air is extended to a dental department, HTM 02-01 asks for a duplex pressure-reducing station at 600 kPa.

Names and industrial air

ISO 7396-3 refers to "air for driving surgical tools", HTM 02-01 calls it surgical air, and ACSS ET 03/2006 treats it as medical compressed air at a higher pressure. Whatever the name, it is not industrial air: ACIH, the Ultra Controlo industrial compressed air system for hospitals, serves building equipment, and its datasheet explains that it was developed because hospital standards prohibit the use of medicinal air for industrial purposes. It is not surgical air.