Designed specifically for use in critical cleanroom applications, the Guardian CR2000 features a patented circuit that results in balanced delivery of positive and negative ions, which ensures that the unit will maintain an ion balance of 0 +/-5V. Balance stability is further enhanced by use of SIMCO's unique "ion shields" at the fan outputs to reduce parasitic ion loss, and by the addition of a circuit to control "charge pumping" between emitter assemblies. All fan and air bearing surfaces are manufactured free of silicones. Fan assemblies are run-in and particle-tested to 10% of class 10 (209E; ISO class 4) particle limits. The Guardian CR is also equipped with SIMCO's patented built-in emitter point cleaners and a lockout switch to prevent tampering with the desired performance level. Built-in monitor and an outlet to daisy-chain up to 10 units are also standard.

Usually ships within 5-7 days