E.L. Foust 400 Series Air Purifier

The E.L. Foust 400 Series is our largest freestanding air purifier, designed for larger rooms and spaces up to approximately 1,000 square feet. Built with durable all-steel construction, a commercial-grade steel blower, and a steel-framed HEPA filter, the 400 Series is designed for years of dependable performance without plastic components that can crack, discolor, or produce unwanted odors.

Combining commercial-grade HEPA filtration with a large activated carbon media tray, the 400 Series helps reduce airborne particles, odors, fumes, and certain chemical contaminants. Its powerful two-speed blower provides adjustable airflow, making it suitable for homes, offices, classrooms, and other indoor environments.

E.L. Foust air purifiers have undergone independent laboratory testing and are used and recommended by allergists and environmental doctors nationwide.

Why Choose the 400 Series?

• Durable all-steel construction designed for long-lasting performance
• Commercial-grade HEPA filtration to capture fine airborne particles
• Large activated carbon media tray to help reduce odors, fumes, and certain chemical contaminants
• Multiple carbon choices for different air filtration needs
• Two-speed commercial-grade blower for adjustable airflow
• Optional stainless steel upgrade for added durability and appearance
• Optional UV light for additional treatment inside the unit
• Designed for larger spaces up to approximately 1,000 square feet
• Replaceable filters and carbon media for convenient maintenance

Product Specifications

• Recommended Room Size: Approximately 1,000 sq. ft.
• Construction: Durable all-steel construction with optional stainless steel upgrade
• Blower: Commercial-grade, two-speed steel blower
• Particle Filtration: Commercial-grade HEPA filter
• Dimensions: 32" high × 13.5" wide × 13.5" deep
• Shipping Weight: 60 lbs. without filters, plus 15 lbs. for filters
• Shipping Dimensions:
  • Air Purifier: 39" × 18" × 18"
  • Filters: 18" × 12" × 12"
• Fan Capacity: 380 CFM (high) / 285 CFM (low)
• Noise Level: 43 dB (high) / 39 dB (low), measured at 3 feet
• Power Requirements: 120V AC
• Power Consumption: 240 watts / 2.0 amps (high); 144 watts / 1.2 amps (low)
• Adsorptive Surface Area: 48,800,000 sq. ft. (Refers to the internal and external surface area of the carbon, not the recommended room size.)
• Optional UV Bulb: 14 watts, 120 volts, 254 nm wavelength

Filter Options & Maintenance

HEPA Filter: Each new unit includes a commercial-grade HEPA filter designed to capture fine airborne particles, including particles as small as 0.3 microns. The filter may last up to 3 years, depending on use and air quality.

Activated Carbon: The large carbon media tray allows customers to choose a carbon blend based on their filtration needs. Typical carbon replacement is every 6–9 months, depending on use and environmental conditions.

Pleated Pre-Filter: Included with each unit to help capture larger airborne particles. Typical replacement interval is 2–3 months.

Optional UV Light: Available as an additional feature for treatment inside the purifier. Typical bulb replacement interval is approximately one year.

Optional Upgrades

Stainless Steel: Upgrade to stainless steel construction for added durability and a polished appearance.

UV Light: Add an ultraviolet light for additional air treatment inside the purifier.

The 400 Series can operate continuously or as needed, depending on your indoor air quality concerns.