Dennis, et al;


Having installed both the Day/Night model N20703 (last fall) and N20803 (just 
last week) on Imzadi, I have a couple of observations.


I’ve replaced my dorade boxes with these fans. The Day/Night Plus N20703 was a 
pretty simple installation. The main difficulty was enlarging the 3” diameter 
hole in the deck to fit the larger diameter of the fan. The mounting plate 
screws to the deck, and the fan itself screws to the mounting plate. So it is a 
pretty  robust installation. There is a trim ring included for installation 
inside the headliner, but I just enlarged the hole in the white Lexan panels 
that covered where my dorades came through the ceiling. (BTW, you refer to the 
Day/Night Plus as the “new” Nicro. They’ve actually been available for a couple 
of years snow.)


The new N20803 fan is larger in diameter overall, stands higher off the deck, 
and needs a significantly larger hole through the deck. Installation was, 
consequentially, much more difficult. Installation is by a trim ring that the 
fan screws into with an O-ring seal between the upper trim ring and the fan 
(there are two neoprene seals between the fan and the deck), and a lower trim 
ring that screws onto the output of the fan and is supposed to snug up to the 
headliner. The minimum spacing of the two rings is 3”, and the deck/headliner 
of my 38 above the head is only 2” thick, so I had to modify both trim rings to 
get them to screw into place.


The light on the N20803 is a nice feature, and the access to the battery is 
easier if it needs replacing. And you can switch from intake to exhaust by 
flipping a small switch on the light housing rather than changing the fan 
blades. The assembly  seems pretty  robust. I suspect that you are correct 
about sheets hanging up on the fan, but my fans are between the “islands” on 
the cabin top for mounting winches and cleats, so that is probably not a real 
problem for me… certainly they are a lot less likely to capture sheets than the 
old dorade boxes and cowl vents.


Unfortunately, the housing that holds the lights and switches seem to have cut 
down on the amount of air being moved. My two fans are about 3 feet apart, and 
the Day/Night Plus N20703 is moving noticeably more air.


Also unfortunately, while the Day/Night Plus N20703 and 4 are in the on-line 
Marineco listing of vent fans, they are no longer in the Marineco catalog. And 
West Marine told me they are being replaced by the N20803 and 4.


In hindsight, I wish I had done a little more research and bought a second 
Day/Night Plus fan from Amazon.


Rick Brass

Washington, NC



From: CnC-List [] On Behalf Of Dennis C. 
via CnC-List
Sent: Sunday, April 8, 2018 1:21 PM
To: CnClist <>
Cc: Dennis C. <>
Subject: Stus-List Solar day/night fans - things you need to know


Be advised that Marinco now makes a day/night fan as an alternative to the 


A few things to know about each.


Nicro - the old style Nicros were fairly low.  If the fan was mounted forward, 
sheets would generally pass easily over the fan.  The new Nicros are higher and 
have a vertical portion to the side.  Sheets will hang up on the vertical 
portion.  The old Nicros were simply inserted into the deck fitting.  They 
could be secured with a trim ring from below.  The new fans are screwed to the 
deck fitting from above.  The new deck fitting is slightly different in size 
from the old fitting so you may have to modify the hole.


Marinco -  Very vertical on the sides.  I suspect sheets will hang up on this 
fan.  It has a nifty night light.  It also seems to protrude more into the 
cabin/head than the Nicro.  Before you buy, be sure to look hard at the fitment 
for this vent.  It could be a head banger.


There are several other solar vents.  Pactrade, Solatron, etc.  Do the research.


Dennis C.

Touche' 35-1 #83

Mandeville, LA




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