I have a problem I'm trying to work out. I'm trying to build an enclosure around a device. The idea behind the enclosure it to protect the device from being in contact with the air surrounding the enclousre. The problem is, one end of the enclosure needs an opening to the environment. Therefore in order to keep the outside air from getting in, I need to pressurize the compartment. My plan is to hook a compressor up to a series of tubes and pump the compressed air into the enclosure. How am I to ensure the compartment is pressurized and isn't sucking air in through the "exit" end, open to the environment.

Please help. Thanks, Scott

(1). The reverse flow at the "exit" comes from the fact that local pressure inside the "exit" is lower than the pressure outside the "exit". (2). So, position your compressed flow also near the inside of the "exit". In this way, the pressure inside the "exit" will be higher than the pressure outside the "exit". (3). If you position the compressed air at the wrong place, it might induce more reversed flow at the "exit". Well, it depend on the geometry and design of your enclosure.