There's a small HEPA filter on the suit itself, downstream of the air hose connection, that filters out whatever may be on the hose connection. You can go with

There's a small HEPA filter on the suit itself, downstream of the air hose connection, that filters out whatever may be on the hose connection. You can go without a connection for several minutes easily. The article also unusually describes "thinking about keeping the suit under positive pressure." The vents in the suit have one-way valves, so it really isn't something you need to think about. (-occasional researcher in a BSL4)