i thought the same thing when i read it , how does it work? this seems like a stand alone model. you could put another reducer on the other end though to make it an inline scrubber, like the one on the other side. i havnt built one yet, but i too would like to know of a decent, silent, fan that can be bought at a normal home improvement store. fyi this thread is how i found cann . com. when i was looking into a scrubber a long time ago. glad i stayed. that is a chunk of change to put out with the fan and a scrubber if you bought them premaid at a store.