Page 245 - IGC BOOK

As a generalisation, the need for personal protection during normal working should be
avoided. However, there will always be some exceptions to this rule and protective footwear,
headgear, hand protection and special clothing are worn during most, if not all, of the working
time in some cases.

Types of Respiratory Protective Equipment

Respiratory protection can be classified into three basic types as follows:

• Air purifying respirators
• Fresh air masks
• Self-contained breathing apparatus

AIR PURIFYING RESPIRATOR are fit for use in atmospheres where there is sufficient or normal
oxygen content and should not be used in oxygen deficient atmospheres. This essentially purifies
the air from contaminants. Particulate dust filter masks, vapor and gas removing cartridges or
canister masks can be included in this category.

Filter Face - Piece Canister Respirator Half Mark Respirator

FRESH AIR MASKS: Fresh compressed air from an outside source is
supplied through a hose to the face piece worn by the person. It offers a
reasonably good protection from respiratory hazard limitations. Length of
air hose can limit the travel distance. If the compressor intake air is
contaminated the supply air will be contaminated. Hence location is
important and must be checked.

S.C.B.A.: The user carries with him air supplied from a source and it offers
protection against all types of respiratory hazard. The duration for which Self-Contained
the air in storage will be sufficient will have to be borne in mind and the Breathing Apparatus.
person must quit the area deficient in oxygen to a safe place

Self-contained apparatus
Self-contained breathing apparatus provides air or oxygen to the user from cylinders or
some other form of container which is carried in a harness on the user’s chest or back. The

ENSIGN| Unit IG2 – Element 7 – Chemical and Biological 40
Agents