Patent ID: 8172923

Claim:
A method of venting a chamber at sub-atmospheric pressure to about atmospheric pressure, said method comprising: opening an inlet valve to a substantially disk shaped gas diffuser membrane, said inlet valve upstream of said substantially disk shaped gas diffuser membrane, said substantially disk shaped diffuser membrane has a maximum inlet pressure with outlet to vacuum of 100 psi or more, a 9 LRV retention of 0.003 micron particles at volumetric gas flow of 30 slpm, and a flow rate at maximum inlet pressure of about 100 slpm; flowing a source gas through said substantially disk shaped gas diffuser membrane into said chamber, said chamber at sub-atmospheric pressure, and establishing a differential pressure of 70 psid or more across said substantially disk shape gas diffuser membrane during flow of said gas source gas through the substantially disk shaped diffuser membrane into said chamber, stopping the supply of source gas to said substantially disk shaped gas diffuser membrane when said chamber reaches a final pressure of about atmospheric pressure.