5 ms·
"To qualify as HEPA by US government standards, an air filter must remove (from the air that passes through) 99.97% of particles that have a size of 0.3 µm." C
by lappa 10y ago
"To qualify as HEPA by US government standards, an air filter must remove (from the air that passes through) 99.97% of particles that have a size of 0.3 µm."
Carbon monoxide is a few orders of magnitude too small to be caught by a HEPA filter, in fact a filter that could filter CO would filter oxygen and nitrogen as well. Such a filter would just be a pump.
There, however, exists a patent for a filter for CO, it works by converting the CO to CO2:
https://www.google.com/patents/US5564065 https://www.google.com/patents/US5564065
- spqr0a1 10y agoIt is possibly to filter gases of similar molecular weight. https://en.wikipedia.org/wiki/Membrane_gas_separation https://en.wikipedia.org/wiki/Membrane_gas_separation This technique is routinely used to generate concentrated supplies of oxygen or nitrogen, but is wildly expensive compared to ventilation.
- Baeocystin 10y agoNeeding to eliminate CO is an old, well-solved problem. Even the cheapest catalytic converter would do so. (It's not quite as simple as just putting one in-line with the waste gas flow- the catalyst would also need to be externally heated.)