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Home > News & Case Studies > Forestry News Forestry News Fire Dozers: Keeping Air Clean & Cool in the Heat of Action Cab air quality is a major issue for Fire Dozers, which clear fire breaks in forest fires situations, and Respa-SD is a great solution. HEPA-Rated RESPA-SD "Eats" Smoke! And MORE than smoke - all kinds of fine particulate down to 0.3 microns, including aerosol contaminants such as ag sprays, clinker dust, paint, RCS, coal dust, DPM and more.