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This acronym stands for "Most Penetrating Particle Size" and refers to the size particle that most penetrates a filter during HEPA filter testing under EN 1822 certification standards. Once the MPPS is determined, the filter is then tested against only particles of this size to determine its performance.

MEGAfilt® Plus

A Bosch trade name for a high filtration dustbag.


This is a Bosch dustbag that features three layers for better dust retention. Bosch claims that 99% of all particles remain in the dust bag.

Mercury Vapors

Mercury vapors are released during the drilling and removal of amalgam based dental fillings. There is significant controversy regarding whether or not amalgam fillings pose a health risk but it is generally accepted that mercury vapors released during their removal may be harmful and that patients and staff should be protected from inhalation of such vapors.


A term relating to microorganisms and their life processes. In the air and water purification industries, this term is generally used to refer to harmful microorganisms.


This is a general term that indicates that a vacuum cleaner, bag or filter offers higher levels of filtration than normal. However, unless levels of filtration efficiency and particle size are specified, this term by itself is meaningless. See "Filtration Efficiency".

Microflo Dustbags

A trade name for dustbags for Numatic vacuum cleaners.

Micro-Hygiene Filter

A SEBO trade name for their HEPA filter.

Micrometer (µm)

A micrometer is a unit of measure that is one-millionth of a meter. Another way of expressing this is that a micrometer is one-thousandth of a millimeter or one 25/1,000th of an inch. A human hair may be between 50 and 100 micrometers in diameter. In the vacuum cleaning and air purification industry this term is generally used to describe particle sizes of contaminants found on surfaces and in the air. A micrometer is synonymous with the now obsolete term, micron.


See "Micrometer"


Most specifically, these are organisms that are microscopic in size. In the air and water purification industry this term generally refers to harmful or disease causing biological organisms.

Microtex 4-Stage Filtration System

This is a trade name for a multilayer, high efficiency filter for certain Numatic vacuum cleaners that when used in conjunction with Numatic 3-layer Microflo dustbags will upgrade the machine to full British Allergy Foundation approval (for dry use only).


This term has not been well defined by the Federal Trade Commission but is generally used to indicate toxins produced by microbes such as mold or other processes of decomposition.

Mineral Absorption Pads

Used in warm mist humidifiers such as Slant Fin, mineral absorption pads are placed in the boiling chamber to capture minerals before they are expelled into the air stream.

Mold Mycotoxins

Mold can produce chemicals known as mycotoxins, which can cause illnesses in sensitive individuals or in individuals that experience repeated or large-scale exposures.

Mold Remediation

This is the process of safely removing mold from indoor environments. High quality, high filtration vacuum cleaners are often used in this process. Sometimes referred to as Mold Abatement.

Mold Spores

Molds reproduce by producing spores. Spores are differentiated by whether they can move or not. While both types of spores are of concern in the cleaning and air purification industry there is particular concern about airborne spores and their ability to trigger asthma, allergies and respiratory illnesses.

Multiple Chemical Sensitivity

This is a syndrome also known as "MCS" or "Environmental Illness" (EI) where a variety of multiple symptoms occur with low-level chemical exposure from a wide variety of sources. Symptoms commonly reported include fatigue, difficulty concentrating, memory loss, weakness, dizziness, headaches, heat intolerance and depressed mood. There is a great deal of controversy concerning this condition in the medical community.

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