Omega Air AAFO2 and HFO2 oxygen filters

For oxygen Omega Air AAF O2 and HF O2 oxygen filters in the white version

Omega Air filters for compressed oxygen come in two ranges: AAFO2 with a working pressure of up to 16 bar and the high-pressure HFO2 up to 50 bar. The manufacturer developed them specifically for removing solid particles from compressed oxygen.

Both ranges have three filtration stages: the dust filter R 1 µm, the fine pre-filter M 0.1 µm and the microfilter S 0.01 µm. The manufacturer lists them for industrial use, medical applications, food and beverages, petrochemicals and wastewater treatment.

2 rangesAAFO2 up to 16 bar, HFO2 up to 50 bar

3 stagesfiltration 1, 0.1 and 0.01 µm

1/8"–3"connection

46,000 l/minhighest flow at 7 bar

Two ranges by pressure

AAFO2 up to 16 bar

17 sizes with 1/8" to 3" connections, flow of 167 to 46,000 l/min at 7 bar. Aluminium housing.

High-pressure HFO2 up to 50 bar

9 sizes with 1/2" to 3" female pipe threads, flow of 1,183 to 46,000 l/min at 7 bar. Cast aluminium housing.

Comparison of AAFO2 and HFO2

Parameter	AAFO2	HFO2
Working pressure	16 bar	50 bar
Working temperature	+1.5 to +65 °C	+1.5 to +65 °C
Connection	1/8" to 3"	1/2" to 3" female pipe thread
Number of sizes	17	9
Flow at 7 bar	167–46,000 l/min (10–2,760 Nm³/h)	1,183–46,000 l/min (71–2,760 Nm³/h)
Filtration stages	R 1 µm, M 0.1 µm, S 0.01 µm	R 1 µm, M 0.1 µm, S 0.01 µm
Housing	aluminium, white	cast aluminium, white with a black head
Condensate drain	manual valve or ball valve	ball valve, ordered separately

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Three filtration stages

Stage	Filtration rating	What it traps
dust filter R	1 µm	solid particles down to 1 µm
fine pre-filter M	0.1 µm	fine solid particles down to 0.1 µm
microfilter S	0.01 µm	the finest solid particles down to 0.01 µm

Filtration stages in the direction of flow: R, M, S — In the direction of flow: R dust filter 1 µm, M fine pre-filter 0.1 µm, S microfilter 0.01 µm.

The stages are arranged in the direction of flow, starting with the coarsest: the dust filter R traps solid particles down to 1 µm, the fine pre-filter M down to 0.1 µm and the microfilter S down to 0.01 µm. Each stage protects the one after it. The fine pre-filter M goes before the microfilter S — it does not replace the microfilter, but it extends its life.

How to choose the range, size and stage

The range is determined by the pressure in the line: up to 16 bar AAFO2, up to 50 bar HFO2. Choose the size by flow in the range table, and the stage by how fine the particles are that the filter needs to trap.

The flows apply at an ambient temperature of +20 °C, an inlet temperature of +35 °C and a pressure of 7 bar. For other conditions, the flow is converted using a correction factor — contact us.

Other parts for oxygen lines

For oxygen lines, we also offer pressure vessels for oxygen and GOX pressure hoses for oxygen.

Ventilek’s tip

Choose the range by the pressure in the line. Up to 16 bar, AAFO2 is sufficient, and it also has the smallest sizes from 1/8". For pressures above 16 bar and up to 50 bar, there is the high-pressure HFO2 range.

What is the difference between AAFO2 and HFO2?: Mainly the working pressure: AAFO2 up to 16 bar, HFO2 up to 50 bar. AAFO2 has 17 sizes with 1/8" to 3" connections and an aluminium housing; HFO2 has 9 sizes with 1/2" to 3" female pipe threads and a cast aluminium housing. The filtration stages R, M and S are the same in both ranges.
Which filtration stage do I need?: It depends on how fine the particles are that the filter needs to trap: dust filter R down to 1 µm, fine pre-filter M down to 0.1 µm, microfilter S down to 0.01 µm. The fine pre-filter M goes before the microfilter S.
How is condensate drained?: For oxygen filters, the manufacturer only lists manual drainage: a manual valve or ball valve on AAFO2, a ball valve on HFO2. The HFO2 filter is supplied without a condensate drain, which is ordered separately.
Where can I find spare elements?: In the size table on the page of each range: for each size and stage, there is a link to the filter and to its element.

Data on sizes, flows and weights are based on the technical documentation for the Omega Air AAFO2 and HFO2 ranges. Flows apply at 7 bar, an ambient temperature of +20 °C and an inlet temperature of +35 °C.

You will find other ranges of compressed air filters among the industrial filters; Omega Air filters for compressed air are in the AAF range.