The second is the hepa filter which honeywell suggests changing once a year.
Fan powered hepa filter.
They supply purified air to cleanrooms and laboratories within the life science food and beverage and microelectronic industries by removing harmful airborne particles from recirculating air.
Fan filter units are stand alone units with integrated hepa filter fan and control system.
Fan powered hepa filters self powered air filter modules have become a popular substitute for terminal air filtration units because of their flexibility and ease of installation.
The mac 10 was designed and engineered by the us government in the engineering labs in new mexico as a means to deliver ultra clean air into environments where conventional fans and ducted hepa would not work.
Cleanroom hepa filters the envirco mac 10 original is just that the original modular self powered fan hepa module on the market.
If you want cleaner air in a fairly small room honeywell s dh hpa060 is the right choice.
Air circulation is maintained by using a lightweight forward curved fan powered by a 120v or 277v 60hz motor.