Valved vs Non-Valved P2 Respirators for Work: Which Do You Need?

If you've shopped for P2 respirators before, you may have noticed that some have a small valve on the front, while others don't. It's easy to assume that a valved P2 respirator provides stronger filtration or a higher level of protection than a non-valved version. 

However, that's not the purpose of the valve. Both valved and non-valved P2 respirators are designed to provide protection against certain airborne particulate hazards when appropriately selected, fitted and worn. 

And whether your P2 respirator has a valve or not, it's important to understand its limitations. A standard P2 particulate respirator shouldn't automatically be relied upon for protection against gases or vapours—different respiratory hazards may require different types of respiratory protection.

So, what's the difference between valved and non-valved P2 respirators, and when might you choose one over the other? Let's look at how each design works, what the valve actually does and the factors to consider when choosing respiratory protection for the job.

First, what does a P2 respirator protect against?

Before comparing valved and non-valved respirators, it helps to understand what P2 protection actually means.

In Australia and New Zealand, particulate respirators are covered by AS/NZS 1716 – Respiratory protective devices. Under this standard, P2 filters are required to demonstrate a minimum filtration efficiency of 94% under the specified laboratory test conditions.

However, that 94% figure refers to the filter's performance under standardised testing. It doesn't mean that a person wearing any P2 respirator will automatically receive 94% protection in real-world conditions. The respirator must also be appropriate for the hazard, worn correctly and, for tight-fitting respirators, achieve an adequate seal against the wearer's face.

P2 respirators are often compared with N95 respirators, which are certified under the US NIOSH standard and are required to filter at least 95% of airborne particles under their specified test conditions. While P2 and N95 respirators provide a broadly comparable level of particulate filtration, they are tested and certified under different standards, so the classifications shouldn't be considered exactly interchangeable. 

A P2 respirator is a type of particulate-filtering respirator. When appropriately selected, correctly fitted and worn as intended, it is designed to reduce the wearer's exposure to certain airborne particles.

Depending on the hazard and application, these particles may include:

• Dusts, such as those generated during certain sanding, drilling, cutting or construction activities

• Mists and liquid aerosols, consisting of small droplets suspended in the air

• Smoke and other fine airborne particles

• Fumes made up of fine particulate matter, such as those produced by certain industrial processes

• Biological aerosols, which may include airborne particles containing microorganisms

The important word here is particles. A P2 respirator works by filtering particulate matter from the air as it passes through the respirator's filter material.

What doesn't a standard P2 respirator protect against?

A standard P2 particulate respirator should not be assumed to provide protection against gases or vapours. These contaminants behave differently from airborne particles and may require a different type of respiratory protection with filters or cartridges specifically selected for the particular gas or vapour.

For example, depending on the substance and exposure, tasks involving solvents, certain cleaning chemicals, paints or other chemical vapours may require respiratory protection beyond a disposable P2 particulate respirator.

It's also important to recognise that not every particulate hazard automatically calls for a P2 respirator. The type and concentration of the contaminant, duration of exposure and workplace risk assessment can determine whether P2 protection is appropriate or whether a higher or different level of respiratory protection is required.

And this limitation applies whether the P2 respirator has a valve or not. Adding an exhalation valve doesn't make a particulate respirator suitable for gases or vapours, nor does it increase its P2 filtration classification.

What is a valved P2 respirator?

A valved P2 respirator is a P2 particulate respirator fitted with an exhalation valve, usually visible as a small plastic component on the front or side of the respirator.

The valve is designed primarily to change what happens when the wearer breathes out. It generally operates as a one-way mechanism:

• When you breathe in: The exhalation valve closes, so inhaled air is drawn through the respirator's P2 filter material.

• When you breathe out: The valve opens, allowing exhaled air to leave more directly through the valve.

This means the valve doesn't provide additional filtration for the air you breathe in. A valved P2 respirator still relies on its particulate filter material to reduce the wearer's exposure to appropriate airborne particles.

So, why add a valve at all?

Its main purpose is wearer comfort. Allowing warm, humid exhaled air to escape more easily can help reduce resistance when breathing out and may help minimise heat and moisture build-up inside the respirator. 

This can make valved respirators particularly useful in certain work environments and situations, including:

• Construction

• Trades

• Warehousing

• Manufacturing

• Outdoor work

• Physically demanding jobs

• Hot Australian conditions

Of course, a valved P2 respirator should only be used where P2 particulate protection is appropriate for the particular hazard, and where the use of an exhalation valve is suitable for the work environment.

There's also an important trade-off. Because exhaled air can pass through the valve without travelling through the respirator's main filter material, many valved respirators don't filter the wearer's outgoing breath in the same way as a non-valved respirator. This can be important in environments where source control—reducing the respiratory particles released by the wearer—is also required.

We'll look more closely at this distinction later, particularly when comparing valved respirators for industrial use with respiratory protection used in healthcare and infection-control settings.

What is a non-valved P2 respirator?

A non-valved P2 respirator provides P2 particulate filtration without a dedicated exhalation valve. Instead, the respirator's filter material is involved in airflow both when the wearer breathes in and breathes out. 

Because there is no valve providing a direct pathway for exhaled air, a non-valved respirator may feel warmer or more humid during extended wear, particularly during strenuous activity or in hot conditions. The amount of breathing resistance and heat build-up can vary considerably between respirator designs, however.

One important advantage of a non-valved design is source control. Because there isn't an unfiltered exhalation valve, a non-valved respirator can help reduce the respiratory particles released by the wearer into the surrounding environment, while also providing particulate protection to the wearer when correctly fitted and used.

This can make non-valved respirators particularly relevant in settings where both wearer protection and reducing the spread of respiratory particles from the wearer are important, such as certain:

• Healthcare and clinical environments

• Aged care settings

• Infection-control situations

• Environments involving vulnerable people

Read related article: The Difference of P2/N95 Mask Filtration: Meltblown vs. Nanofibre

Are valved P2 respirators suitable for healthcare?

Valved P2 respirators can provide particulate protection to the wearer, but the exhalation valve introduces an important consideration in healthcare settings: source control.

In healthcare, respiratory protection may need to perform two roles at the same time:

• Protect the healthcare worker from airborne particles and infectious aerosols.

• Help protect patients and others nearby from respiratory particles released by the wearer.

With many valved respirators, the valve opens when the wearer breathes out, allowing exhaled air to leave without passing through the respirator's main filter material. As a result, respirators with an unfiltered exhalation valve may not provide the same level of source control as an appropriate non-valved respirator.

This can be particularly important when working:

• Directly with patients

• In infection-control or isolation environments

• Around vulnerable or immunocompromised patients

• In settings where source control is specifically required

For these reasons, non-valved P2 respirators are generally preferred where both respiratory protection and source control are required.

However, not every valved respirator is designed in exactly the same way, and requirements can vary between healthcare facilities and clinical situations. Some respirator designs may incorporate additional features that filter or cover exhaled air.

Healthcare workers should therefore follow their organisation's infection-prevention and respiratory-protection policies and use the specific respirator approved for the task rather than choosing between valved and non-valved models based on comfort alone.

Are valved P2 respirators suitable for healthcare?

Valved P2 respirators are commonly associated with construction, trades and industrial environments, where the primary purpose of the respirator may be to protect the wearer from airborne particulate hazards rather than provide source control.

For certain tasks, workers may be exposed to airborne particles generated by activities such as:

• Sanding and grinding

• Drilling and cutting

• Woodworking

• Demolition and construction work

• Handling dusty materials

• Manufacturing and maintenance activities

Where a P2 respirator is appropriate for the identified hazard, a valved design may offer additional comfort, particularly during physically demanding work. The exhalation valve allows warm, humid air to escape more easily and can reduce resistance when breathing out—something that may be especially useful during extended wear or when working in hot conditions.

However, not every construction or industrial hazard can be managed with a P2 respirator. Some tasks may generate very high concentrations of particulates or involve substances that require a higher level or different type of respiratory protection like the P3 or P100 respirators.

It's also important to consider whether the work involves gases or vapours in addition to particles. For example, some paints, solvents, adhesives and chemical products can release vapours that a standard P2 particulate filter isn't designed to remove. In these situations, respiratory protection with an appropriately selected gas or vapour filter or cartridge—or combined particulate and gas/vapour protection—may be required.

Comparison: Valved vs non-valved P2 respirators

 

Does a valve affect respirator fit?

Having an exhalation valve doesn't remove the need for a proper fit. Both valved and non-valved P2 respirators are tight-fitting respiratory protective devices and need to form an adequate seal against the wearer's face to provide their intended protection.

The valve itself is primarily designed to manage exhaled airflow. It doesn't compensate for problems such as:

• Choosing the wrong respirator size or shape

• Gaps around the nose, cheeks or chin

• Incorrect strap positioning

• Facial hair crossing the sealing surface

• Other PPE interfering with the respirator

• Incorrect positioning of the respirator on the face

In workplace settings where fit testing is required, a valved P2 respirator should be fit tested just like a non-valved tight-fitting respirator. Remember that fit-test results apply to the specific make, model, style and size tested, so passing a fit test with a non-valved respirator doesn't automatically mean a valved model will fit you equally well—or vice versa.

You should also perform the manufacturer-recommended fit check each time you put the respirator on to make sure it is correctly positioned and appears to have achieved an adequate seal.

Choosing the right P2 respirator for the job

When comparing valved and non-valved P2 respirators, neither option is automatically better than the other. The right choice depends on the hazard you're protecting against, the environment in which the respirator will be worn and whether source control is also important.

Both types can provide P2-level particulate filtration when they meet the relevant standard, are appropriate for the hazard and are correctly fitted and worn. The key difference is the exhalation valve. A valved respirator allows exhaled air to escape more directly, which can help reduce exhalation resistance, heat and moisture build-up. A non-valved respirator doesn't have this dedicated pathway and may therefore be more appropriate in situations where controlling respiratory particles released by the wearer is also required.

Most importantly, don't choose respiratory protection based on the presence or absence of a valve alone. Start by identifying the airborne hazard and determining the appropriate level and type of respiratory protection. Remember that a standard P2 particulate respirator—valved or non-valved—shouldn't automatically be relied upon for protection against gases or vapours.

Whichever design you use, proper fit remains essential. Choose a respirator that is suitable for the individual wearer, follow the manufacturer's instructions and workplace respiratory protection procedures, and perform the recommended fit check each time it is worn.

Shop Our Range of P2, N95 & FFP2 Respirators

P2, N95 & FFP2 Respirators

Explore our range of P2, N95 and FFP2 respirators, with both valved and non-valved options available for a variety of respiratory protection needs. Choose from Australian-made AMD P2 respirators and trusted brands such as 3M, Detmold, Trident, and more.

Shop Collection