25MM fan to airline hose adaptor

While checking out the G+ Makibox user group, I saw a discussion about adding a fan to the hot end https://plus.google.com/103982631119479761813/posts/gMcAYUUjnyy. Another user had designed a system to hang a fan on the hot end
http://makibox.com/forum/topic/2405
I kind of like the idea of using an aquarium air pump a little better, but I get why some users would want to use a board-powered fan (one less AC plug for starters). On the other hand, having the fan mounted on the print head does