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by throw0101a
1149 days ago
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> It’s possible to have a UV system that does what you want without the downside, but it does cost. The main downside is that you are introducing a chemistry experiment into your ventilation system. If you want clean air, then (a) cycle in/outside air at ASHRAE-recommended volumes, and (b) use high-MERV/HEPA filters. In wildfire zones and in wildfire season you can perhaps add charcoal filters—if your system is designed to handle the pressure/head loss—to get rid of the smoke-y smells. |
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• 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?