Page 5 - FT RESPIRATORY PROTECTION

SELECTING THE RIGHT
PROTECTION CLASS

To select the right protection against
gases and vapors the chemical nature
of the pollutant must be known.

Primary objective of using respiratory
protection is to prevent exposure
to air contamination and avoid
complications.

Be sure to consider the following
in selecting the right respiratory
protection for the job:

• Identify the respiratory hazards
present in your workplace.

• Evaluate the hazards that you
have identified.

• Conduct testing on the workers to
determine if they fit to wear RESPIRATORY PROTECTION
respirators. Source: British Occupational Hygiene Society (BOHS)

Refer on the below tables to indicate which type of filter to use depending on the contaminant and its
concentration, making sure the oxygen level is greater than 17%.

CLASS 1 2 3
CAPACITY LOW MEDIUM HIGH
EXPOSURE LIMIT 1000 ppm 5000 ppm 10000 ppm

HALF FACE MASKS FULL FACE MASKS
NPF Max Concentration NPF Max Concentration
GAS 50 50xTLV 2000 2000xTLV
GAS P3 48 48xTLV 1000 1000xTLV

*TLV: time-weighted average concentration of a substance to which the operator can be exposed without
adverse health effects.

Nominal Protection Factor (NPF) - is a number derived from the maximum percentage of total loss
(towards the inside of the breathing apparatus) allowed by European standards.

Assigned Protection Factor (APF) - is the level of respiratory protection that one can realistically
expect in the workplace by 95% of the PPE users.

www.flowtronix.com | 5