How to use a Gas Mask

Published on March 23, 2026
Duration: 0:59

This guide details the proper procedure for donning and sealing a MIRA Safety CM-7M gas mask, as demonstrated by an experienced instructor. It covers strap adjustment, face preparation, the donning sequence, and a critical seal test involving exhaling against the filter. Proper technique is essential for the mask's effectiveness in protecting the wearer.

Quick Summary

Learn to properly don and seal a MIRA Safety CM-7M gas mask with this expert guide from Polenar Tactical. Key steps include strap adjustment, face preparation, correct donning sequence, and performing a critical seal test by exhaling against the filter and checking for suction.

Chapters

  1. 00:00Introduction: Donning Difficulty
  2. 00:06Step 1: Prepare the Gas Mask Straps
  3. 00:21Step 2: Prepare Your Face
  4. 00:29Step 3: Proper Donning Sequence
  5. 00:41Step 4: Perform the Seal Test

Frequently Asked Questions

What is the first step in preparing a gas mask for donning?

The first step is to adjust the gas mask straps. Ensure the top two straps are tightened, then completely untighten all other straps. Pull the front strap forward to prepare the mask for placement on your face.

How do you test if a gas mask has a proper seal?

To test the seal, block the exhaust valve and exhale forcefully. Then, place your hand on the filter and inhale. If suction is created, indicating a proper seal, you can remove your hand and breathe normally.

Why is face preparation important before putting on a gas mask?

Before donning, it's crucial to stop breathing, close your eyes, and clear your face of any hair or debris. This ensures a clean surface for the mask to create an airtight seal, maximizing its protective effectiveness.

What is the correct sequence for tightening gas mask straps after donning?

After placing the mask on your face, tighten the bottom straps first, followed by the upper ones. This systematic approach helps to secure the mask properly while you are still holding your breath.

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