Patent ID: 6102977
Filing Date: 2000-08-15
Classification: B01D,F24F,Y10S

Abstract:
An air filtration system for supplying filtered air to a clean environment, comprising:a make-up air handler, including:a flow passage having an inlet end through which outside air is introduced into the flow passage and an outlet end through which the outside air is exhausted from the flow passage; andat least one air filter disposed to remove particulate from the outside air passing through the flow passage, each air filter being composed of a boron-free filter material;wherein no boron is introduced into the outside air passing through the flow passage by the at least one filter; anda secondary air handler in communication with the make-up air handler, the secondary air handler filtering the outside air passed through the at least one air filter of the make-up air handler before supplying the outside air into the clean environment.