Written and maintained by CASRAI Editorial Board
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This page describes products and general use; it is not medical advice.
“Nebulizer filter” names two different parts. One is the small air filter that sits in the inlet of a compressor nebulizer. The other is an in-line bacterial/viral filter placed in the air path of a nebulizer therapy machine. Which kind a device uses, and how often it is changed, is set by the manufacturer’s instructions for use (IFU) for that exact device. Who uses them: clinic staff who maintain shared compressors, home-care and supply buyers matching a part to a model, and students learning how nebulizer systems are built.
What a nebulizer filter is
A nebulizer filter is a replaceable filter element in the air path of a nebulizer system. For compressor nebulizers, manufacturers describe an inlet air filter in the compressor unit: PARI places it in the front panel of the PARI BOY N compressor, and OMRON places it inside an air filter cover on the back of the NE-C801. A second class, sold by filter manufacturers such as GVS, is an in-line filter that is described as protecting the patient and the nebulizer equipment from microbial cross-contamination.
For the compressor itself, see nebulizer compressor specifications and FDA classification; for the whole system, see what a nebulizer is.
How it works and how it is built
Manufacturers publish construction details for only some parts. The GVS in-line filters have a styrene housing, electrostatic filter media and 22F-22M connectors, and weigh 23.5 g at 96 x 69 mm. The PARI IFU lists the compressor filter as a numbered part in the front panel, held by a filter holder. The OMRON NE-C801 box contains a package of five air filters, and the filter sits behind a separate air filter cover that must not be blocked while the unit runs.
Types and variants
The two classes differ in where they sit and what the manufacturer says they do.
| Type | Where it sits | Purpose as stated by the manufacturer | Source |
|---|---|---|---|
| Compressor inlet air filter (PARI BOY N) | Front panel of the compressor, under a filter holder | Replaceable filter; staining or blocking signals replacement | PARI IFU |
| Compressor inlet air filter (OMRON NE-C801) | Inside the air filter cover on the back of the unit | Must be clean and installed before use; supplied as a package of 5 | OMRON manual |
| In-line bacterial/viral filter (GVS 1420 series) | In the air path of a nebulizer therapy machine, 22F-22M connectors | Protection from microbial cross-contamination of patient and equipment | GVS catalogue |
Sizes and specifications that matter
The GVS catalogue publishes filtration values for two in-line models. These figures belong to those models, not to nebulizer filters in general.
| Model | Bacterial filtration efficiency (BFE) | Viral filtration efficiency (VFE) | Resistance at 30 L/min |
|---|---|---|---|
| GVS 1420/01 | 99.998% | 99.974% | 51 Pa |
| GVS 1420/03 | 99.99% | 99.99% | 40 Pa |
Source: GVS filters for nebulizer therapy machine, checked 2026-10-30.
How often to replace a nebulizer filter
There is no universal interval. Manufacturers state different ones, so use the IFU for your own compressor.
| Compressor | Replacement interval stated | Replace sooner when | Source |
|---|---|---|---|
| PARI BOY N | Every 500 hours of operation or at least once a year | Filter is soiled (grey or brown staining), blocked or moist; inspect after every 10th to 12th inhalation | PARI IFU |
| OMRON NE-C801 | Used on average more than 60 days | Filter has changed color | OMRON manual |
| Pulmo-Aide | Every six months | Filter turns grey | VUMC SBAR citing the manufacturer IFU (MIFU 5650) |
How to choose a replacement filter
Two criteria apply, and both point back to the IFU:
- Use the manufacturer’s own filter. The PARI IFU says to use only the original PARI filter, because the compressor could otherwise be damaged or the quality of the therapy impaired.
- Match the model-specific part. OMRON lists its replacement air filters (package of 5) as part C30FL and the air filter cover as C801FC for the NE-C801.
The Vanderbilt University Medical Center infection prevention assessment adds a process point for clinics: a compressor filter that has no orderable item number can mean filter changes are not being performed. Its recommendation is to assign the filter replacement of each compressor to a named person, replace every six months or when discoloration is noted, and document each replacement.
Safe use and handling basics
- Switch the compressor off and unplug it before handling the filter (PARI IFU).
- Do not attempt to clean the filter and reuse it (PARI IFU).
- Do not block the air filter cover (OMRON manual).
- Check that the air filter is installed before use (OMRON manual).
Follow the IFU’s own replacement instructions for your model.
Common mistakes
- Treating one maker’s interval as universal. The three intervals above differ by device.
- Washing or drying a filter for reuse where the IFU says not to.
- Ignoring discoloration. All three manufacturer sources tie replacement to a color change.
- Substituting a non-original filter in a compressor whose IFU requires the original.
- Leaving replacement unassigned in a shared-compressor setting, as the VUMC assessment found.
The compressor-side details also matter for the mask or mouthpiece side of the system; see aerosol mask and what the IFU says. For the regulatory background on such products, see what is a medical device.
Frequently asked questions
What are the two kinds of nebulizer filter?
The compressor inlet air filter sits in the compressor unit (PARI BOY N, OMRON NE-C801). The in-line bacterial/viral filter, such as the GVS 1420 series, sits in the air path of a nebulizer therapy machine and is described by GVS as protecting against microbial cross contamination.
How often does the IFU say to replace a compressor filter?
It differs by device: PARI BOY N every 500 hours of operation or at least once a year, OMRON NE-C801 after about 60 days of average use, and Pulmo-Aide every six months per the manufacturer IFU cited by VUMC. Each also names discoloration as a reason to replace sooner.
Can a nebulizer filter be cleaned and reused?
The PARI IFU says not to attempt to clean the filter and reuse it. Check the IFU for any other model.
Can a different brand of filter be used?
The PARI IFU says to use only the original PARI filter, since the compressor could otherwise be damaged or the quality of the therapy impaired. OMRON lists its own part number (C30FL) for the NE-C801.
Sources
- PARI BOY N instructions for use (PDF, hosted by vitalaire.de), https://www.vitalaire.de/sites/default/files/2021-01/Pari%20Junior%20Boy.pdf, checked 2026-10-30.
- OMRON NE-C801 Compressor Nebulizer instruction manual, https://omronhealthcare.com/storage/pdfs/im_nec801sz_5332875-4d.pdf, checked 2026-10-30.
- Vanderbilt University Medical Center Infection Prevention, SBAR: Nebulizer Compressor Cleaning Instructions, Pulmo-Aide, 2024, https://vumc.org/infection-prevention/sites/default/files/public_files/SBAR%20Nebulizer%20Compressor%20Cleaning%20Instructions%20Pulmo-Aide%202024.pdf, checked 2026-10-30.
- GVS, Filters for nebulizer therapy machine, https://gvs.com/en/catalog/filters-for-nebulizer-therapy-machine, checked 2026-10-30.
