When Should I Change My Respirator Filter?

Many factors influence when you may need to change your respirator filter including:

• Contamination that is being filtered – Some contaminants require the filter to be swapped out each time you are exposed to it. Always refer to the label and SDS for each product you’re using
• Contamination levels – The concentration of contaminants in the atmosphere
• Exposure duration – The amount of time you are in an environment with contaminants present
• Work rate – Your breathing rate
• Environmental factors – Including temperature, humidity and wind
• Filter capacity – A2 filters have a higher capacity than A1 filters and so will last longer in the same conditions
• Your personal risk assessment – Identifying potential hazards that could harm yourself or others and evaluating the potential risks and impact

If you experience dizziness, irritation or other distress, if the respirator becomes damaged or breathing is difficult, and/or if you can smell or taste contaminants then you should leave the contaminated area immediately.

How often should I change my particulate filter?

A general rule of thumb is that you should change your particulate filter when you notice that breathing has become more difficult when you are wearing it. This means that the filter has been ‘loaded’ with particles and needs to be replaced.

You should also change your filter if it is visibly damaged or dirty.

How often should I change my gas and vapour filter?

Gas and vapour filters should be changed according to a schedule. Set a personal time limit to determine how frequently to change them.

To create this limit, write on the filter the date you opened it and then when you are working on a job with that specific chemical, once you start tasting or smelling it, note the period of time since the filter was opened (e.g. 3 weeks). Now you know that the filter will last you that period of time within those conditions. In the future you will have to swap in a new one at this frequency. Keep in mind that not all gases and vapours have a smell or taste and so you must never solely rely on this method.

Note that gas and vapour filters have expiry dates that indicate they should no longer be used. Once opened, their maximum lifespan is no longer than 6 months.

How can I make my respirators and filters last longer?

To prolong the life of your respirators, remove the filters and clean the facepiece after every use. Wear gloves when manually cleaning the facepiece in warm water and do not use harsh disinfectants that will degrade it. After thorough rinsing, allow it to air-dry.

Store your facepieces and filters in a clean and dry place away from dust and grime and where insects cannot enter.

Globe Pest Solutions also sells pre-filters which are designed to be used in front of the main particle and gas filters. These low-cost pre-filters sort out coarse wet and dry particles and protect the main filter, prolonging their service life.