12 v venting fan

[Wayne nicol]

i am wanting to put a vent in above the galley with a smaller, low amp draw fan.
thinking the vent should be on the side, as apposed to the top sides- so as not to impede passage way.
or maybe just vent it out thru the dodger

any ideas anybody.
thanks in advance
wayne

[kmclemore]

The lowest draw fans I've found are the Hella marine fans. They're also very quiet.

[Russ]

I've never been impressed with venting fans. I just open the hatch.

[Tomfoolery]

This may not be of much use, but it may give you an idea.

I put a vent in the head, but it's just passive. I cut a round hole with a hole saw, taking it real easy as the plastic will crack if too much force is applied, and transferred the four mounting holes. I sandwiched a piece of window screen on the inside, and two plastic 4-7/8" x 5-1/2" (124mm x 140mm) vents from WM. The one on the inside is 'upside down' in the sense that the louvers (louvres in Canadian ) also angle upward toward the inside, so any rain that finds its way past the first one still has the second to contend with. Some butyl tape around the top and sides of the outside one, and around the bottom and sides of the inside one, and it's about as water tight as anything. Never got a drop inside, AFAIK.

There's no way to close it, but I don't care. Ventilation was the goal. I don't stay on the boat when it's cold outside. Not that it would make much difference anyway, in a thin uninsulated plastic boat.

I would bet you could so something similar using a 120mm square 12VDC muffin fan (typically 6-14V? operating range) sandwiched in between, maybe with a little trim to disguise it. You should be able to get a real 100 cfm or so from it.

The vent is nearly invisible against the black. Much better than the round SS vent I tried first.

[Tomfoolery]

I've never been impressed with venting fans. I just open the hatch.

Same here. I added small openable ports with internal rain shields to the stern berth (through the cockpit seat walls), one on each side, plus a small mushroom passive vent to the fore hatch, and the head vent I mentioned above, and removed the solar vent from the sliding hatch that was worn out and breaking (plastic exterior mushroom) and stuck in a 3" low-profile scoop vent (no dorade, but it's under the dodger, so no rain ingress) right into the existing hole, and voilà - no more 'boat smell' as my FIL calls it, no matter how long the boat has been closed up. And when I'm on it, hatches are open anyway.

I do have a 12V Caframo Sirocco circulation fan mounted to the head liner above the table, and I use a pair of 120V high-velocity fans (small, but they really blow a strong stream of air) for when I have shore power, but no powered exhaust. I don't feel I need it, and with passive, there's nothing to break.

[Wayne nicol]

see, we can be spending a week or more at anchor up here in the PNW, with high humidity, rain and wet clothes- all leads to high condensation- just trying to get rid of some of it!
going to change the propane heater to a kerosene heater- step one!!!

[Highlander]

Wayne
This was a very economical passive vent mod , they work great & they can be turned in any direction , if u turn one into the wind & the other away from the wind u can create a vacuum process I made the dorade boxes myself cost was approx 80$ . the cowls r removeable & closed off with snap in caps , u can see the whole fabrication & installation process on my photo/buck site in the link below
http://i844.photobucket.com/albums/ab1/ ... da5e21.jpg

http://i844.photobucket.com/albums/ab1/ ... 2ffa24.jpg

here,s another passive vent I have not yet installed it can be left open in inclement weather
http://i844.photobucket.com/albums/ab1/ ... c5c437.jpg

I have one of these 12v/ solar vents too yet to be installed
http://i844.photobucket.com/albums/ab1/ ... 2ff4b3.jpg

This is a great little fan so versatile & super quiet covers any position I want because of where I installed it
http://vid844.photobucket.com/albums/ab ... 6447c3.mp4

installed this also
http://i844.photobucket.com/albums/ab1/ ... 010148.jpg

entrance hatch with opening port light
http://i844.photobucket.com/albums/ab1/ ... 89743a.jpg

http://i844.photobucket.com/albums/ab1/ ... e76fbb.jpg

these cockpit hatches can be used as storage bins , they hold my two cooler bags with 12 cool tall boys & double up for ventilation also if needed
http://i844.photobucket.com/albums/ab1/ ... 99be6e.jpg

4 x 14 & 3 x 10 opening ports
http://i844.photobucket.com/albums/ab1/ ... cef21a.jpg

http://i844.photobucket.com/albums/ab1/ ... 56b385.jpg

http://i844.photobucket.com/albums/ab1/ ... e24c55.jpg

http://i844.photobucket.com/albums/ab1/ ... 1c0d71.jpg

I also have a bilge blower that can vent the whole bilge area & head or either individually

Hope this gives u some idea,s to ponder on

J