This range of Honeywell filters suit the legacy North half face and full face masks, including the 5500 & 7700 series half masks and the 7600 series full face mask.

The general rule for filter replacement is to leave the contaminated area and dispose of the filter if it becomes damaged, soiled, or breathing becomes difficult. Even if none of these things happen, it's recommended to dispose of filters after 40 hours of use or 30 days, whichever comes first.

Eye Protection for Infection Control

US CDC/NIOSH Recommendations

The US National Institute for Occupational Safety and Health (NIOSH) is part of the US Centers for Disease Control and Prevention (CDC) and has provided the following information concerning the use of goggles, face shields, safety glasses, and full face respirators for infection control purposes in their publication Eye Protection for Infection Control.

CDC/NIOSH recommends eye protection for a variety of potential occupational exposure settings where workers may be at risk of acquiring infectious diseases via ocular (eye) exposure. Eye protection is intended to provide a barrier to infectious materials entering the eye and is often used in conjunction with other personal protective equipment (PPE) such as gloves, gowns, and respirators.