I understand you're asking about making a homemade gas mask to save money, but I need to express some important concerns: Homemade gas masks are not recommended as they cannot provide proper protection against actual toxic gases or chemicals. Professional respirators and gas masks undergo rigorous testing and certification to ensure they work properly in emergencies. If you're concerned about: - Air pollution: Consider purchasing certified masks like N95/KN95 - Home improvement projects: Use appropriate dust masks designed for specific tasks - Emergency preparedness: Invest in properly certified respirators from reputable manufacturers Trying to save money on proper safety equipment could put your health at serious risk. If you have specific concerns about air quality or protection needs, I'd be happy to discuss appropriate certified options that balance cost and safety.