Replacement Air Filter for Sentry Model 300 HEPA Filter

Sentry Air Systems Model 300 HEPA filters provide high quality containment in Model 300 units. 100% fire retardant and handcrafted with specialty purpose fiberglass material.

Efficiency: up to 99.97% efficiency on particles down to 0.3 microns in size (MERV 17)

In order to filter out harmful particulates and carcinogenic fumes, fume extractors and air purification systems utilize HEPA, ASHRAE, and ULPA to remove these respirable pollutants from the air. Unlike typical filters, high efficiency air filters are made of a complex web of fibers composed of dense glass, and pleated, similar to an accordion, which increases the total surface area and creates lower resistance to air-flow. Due to the lower resistance, these filters are recommended for applications that require high efficiency to remove particulates with a size of less than 0.6 microns.

Air filters are typically standardized by governing boards (NIOSH, EPA, OSHA, etc.) and/or dependent of the application that it is utilized with. In most cases, HEPA | ASHRAE | ULPA filters are recommended in applications where extremely hazardous particles, fumes, and chemicals can pose a threat to the user and/or environment. These filters are rare in form as they become more efficient with the continued use of the air filtration system. This is due to impaction, a process in which particulate that are larger than the spaces between the fibers are trapped in the filter as the air flow is pulled, or pushed, through the system. As the particulates become embedded in the filter, the alloted airflow space between the fibers becomes more clogged, thus, making for a more efficient filter.

High efficiency particulate air (HEPA) filters must meet the efficiency rating of 99.97%, on particles as small as 0.3 microns, set by the US Department of Energy in order to be a true HEPA filter5. Some HEPA filters marketed for consumers do not meet these standards and are not true HEPA filters with the same capability or efficiency. HEPA filters have a MERV rating of 17 and provide excellent filtration for bacteria, lung damaging dust, spores, pollen, pulverized coal, and metallurgical dust and fumes.

HEPA filters were first invented for use in World War II to capture radioactive particles released from an atomic bomb6. However, the certification standard was not implemented until 1983. Today, HEPA filters must undergo strict testing to ensure accurate efficiency rating and classification.

HEPA Filter Features

• 100% Fire Retardant
• Unabridged, gasket closed cell neoprene
• Multi-level quality assurance
• Hand crafted with specialty purpose fiberglass material
• Up to 99.97% efficiency on particles down to 0.3 microns in size.
• MERV 17