Understanding Fit Test Adaptors

Fit testing is a critical procedure ensuring that respiratory protection equipment seals effectively to the wearer’s face, safeguarding them against hazardous environments. Central to this process are fit test adaptors, indispensable attachments that facilitate accurate assessments of mask performance. In this post, we delve into the significance of fit test adaptors, explore common types, and highlight key considerations.

At Pro Safety and Training, our fit testing methodology relies on the Portacount 8048. The Portacount essentially samples air on the inside of the mask, and compares this with air outside the mask. To do this, the PortaCount connects to the mask through twin tubes, and then an adaptor or probe on the mask.

When testing disposable respirators we must probe the mask with a permanent probe (damaging the mask), and then post-test we discard the mask.

Figure 1- A variety of probed disposables

For reusable respirators, we attach a permanent probe and a P3 filter to the mask being tested.

Some common adaptors we regularly use include:

3M Fit Test Adaptors:

The 3M™ Fit Test Adapter 601 accommodates all 3M half and full-face masks featuring the bayonet-style filter attachment.

Figure 2- A probed 3M 6000 series respirator

Sundstrom Fit Test Adaptors:

The Sundstrom SR 328 Test Adapter fits the SR 100, SR 900, and SR 90-3 half masks.

Figure 3- A probed Sundstrom SR100

If you ever need to purchase adaptors, the best source for this information is from the manufacturer of the mask being tested, or you can use guidance from TSI. Remember you will also need to buy the applicable P3 filter that corresponds with the mask being tested.

Here are some tips for effective use of fit test adaptors:

• Never force adaptors onto masks they’re not designed for, as this may result in inadequate sealing and potential false fit test results, or may even damage to the mask
• Prior to conducting a fit check, ensure the adaptor is securely connected to the Portacount to prevent leaks and ensure accurate results.
• Ensure your sample points are between the mouth and nose, if you are not sampling in the correct location this can affect the fit test accuracy
• Use suction cups or duct tape, to hold your sample port between the mouth and nose
• Check for any tubing kinks or blockages, as these can affect test accuracy. Blowing compressed air through the adaptor beforehand can help identify any issues
• Label adaptors clearly for fit testing, this should prevent it being accidentally used in the workplace

How we can help?

If you require assistance with fit test adaptors, fit test training, or need a group of workers fit tested, contact us here, or call 1300 336 003.