| What I really want is a system that has • Positive pressure maintenance, so that any air leak paths are not introducing outside air pollutants • HEPA filtration, using two filters in series so I can "cycle through" filters, moving the post-filter to the pre-filter location and using a brand-new post-filter (this is similar to the ISS water filter change procedure, and maximizes expendable filter utilization); by the series-parallel circuit math, this should requires four times the total area of HEPA filter • pressure drop sensors, so I only need to replace the HEPA filter when necessary • activated carbon post-filter that lets me to replace only the granules themselves, using bulk activated carbon • washable screen prefilter, to avoid premature saturation of the HEPA medium with >10 micron particles • washable electrostatic prefilter, to avoid premature saturation of the HEPA medium with <1.0 micron particles • HRV/ERV, to avoid unwanted heat and humidity transfer to the outside air • HRS/ERV Bypass, so I can use "free cooling" / "free heating" to exploit natural temperature differences over the day • (optional) MERV-13 post-prefilter, to intercept ~95% of PM2.5 and greatly extend the life of the HEPA filter train Does anyone know of a system that has all these features? |