The Tough Guard will be good, it has a 99% efficiency rating at 20 microns versus the Ultra which has an efficiency rating of 99.9% at 20 microns. The Encore will be fine with the TG.
Originally Posted By: SatinSilver
The Tough Guard will be good, it has a 99% efficiency rating at 20 microns versus the Ultra which has an efficiency rating of 99.9% at 20 microns. The Encore will be fine with the TG.