hello all
I measured all my hatches, and found fans about the same size... they were D battery fans, so I rewired them with a wire and USB plug (12v).... then built a frame hanger and hung them in the open hatches pointing down into the cabins.... for the plug I mounted a USB port in each cabin... this way each guest has a port to charge cell phones and run the fans when needed... the fans are removeable or can be left in place at the closed hatches for easy storage.... in the main cabin and in the Captains cabin we have portholes, and I have fans that attach there to either blow air in or out as desired... they are also set up with the USB ports... all the USB ports are double ports and perminant mounts.... I got them on E-bay from china for about $4 each.... there are 1 fan in the V-berth, 1 fan each port and starboard berths, 2 fans in Cpatians cabin, and 3 fans in the main cabin (galley, settee, nav/capt's desk)...
this is a good arrangement for my boat, and keeps air moving through out the boat....
sincerely
Jess