How to use a Gas Mask

Published on March 23, 2026
Duration: 0:59

This guide, presented by Polenar Tactical, details the critical steps for properly donning and sealing a gas mask, specifically the MIRA Safety CM-7M. It emphasizes the importance of a correct procedure for effectiveness, especially under pressure. The instruction covers strap preparation, face clearing, the sequence of donning and tightening, and a crucial seal test involving exhaling against the mask and then inhaling to check for suction. This technique is vital for ensuring the mask provides adequate protection.

Quick Summary

To properly don a gas mask, first prepare it by adjusting straps: tighten the top two, loosen all others. Before applying, stop breathing, close eyes, and clear your face. Press the mask on, pull straps over your head, tightening bottom straps first, then upper. Finally, perform a seal test by exhaling against the mask and inhaling to check for suction.

Chapters

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

Frequently Asked Questions

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

Before putting on the gas mask, you must prepare it by tightening the top two straps and completely untightening all other straps. Then, pull the front strap forward to get it ready for application.

How do you ensure a proper seal when putting on a gas mask?

To ensure a proper seal, stop breathing, close your eyes, and clear your face of any hair or debris. Then, press the mask firmly against your face and tighten the straps correctly, followed by a seal test.

What is the correct order for tightening gas mask straps?

When donning the gas mask, it's crucial to tighten the bottom straps first, followed by the upper ones. This sequence helps to create a secure and effective seal against your face.

How do you perform a gas mask seal test?

After donning, hold your breath, block the exhaust valve, and exhale forcefully. Then, place your hand on the filter and inhale; suction indicates a proper seal. Remove your hand and breathe normally.

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