Ideas to vent a storage box

The best thing would be a positive air pressure intake then a vent. In short a similar set up to a snorkel to your motor then a vent to expel the air. One at the bottom the other at the top thus forcing the air in then circulating. You can get some good vents that are filtered from a boating shop like Bias. The filter material used on Revers cycle air-cons is also good for dust and can be washed.

Craig

Image Could Not Be FoundHi Carreen,
Have you though about just insulating the box so it won't get hot in the sun. Vents will only lead to insects and ants getting in. But you could try this:see photo

you need some considerable ventilation, both for the sake of the efficiency of the fridge and for dealing with the ventilation requirements of the battery...(there is no such thing as a completly sealed battery).

A couple of slots simply is not going to cut it.

I used to build equipment cabinets, that got filled with heat generating gear.

A postive air preasure arrangement is deffinitely the go.

One or two 120mm computer fans will move a lot of air, standard off the shelf car air filters work very well for filtration, just sandwedge them on with some plate and long bolts....of fit a pod filter to a flange

making it all look good and weatherproof just requires some imagination and a little bit of tradesman like "craft".

as for the air outlets.....if the box is not well sealed the air will come out of every crack, joint, and slot....I used to build in 10mm clearnces at the top and bottom of the doors on the simple units.....a metal speaker grill or a deck vent at the other end of the box will work.

the marine shops will have bilge blowers, but they may go a bit hard.

In the quieter places I use to use simple voltage regulator boards to controll the fan speed and the noise.....most 12 volt fans will run just fine as low as 5 or 6 volts.

OH when buying these fans, buy from the electronic shops not the computer shops, the actual computer fans run slower for less noise...and ore often a bit cheapy

I note that jaycar/electus now have a IP55 rated fan.

cheers

Carreen,
Are your boxes aluminium?
I used a remote thermometer inside the canopy for a few years and the inside temp was never more than a couple of degrees above ambient.

I had plans for all sorts of ways to vent the two fridges in my aluminium canopy - in the end I kept it fully sealed. I found the white finish on the canopy was very reflective and that the aluminium transmits the heat and cold fairly well.

I also decided against any form of insulation - I figured it would tend to keep the heat in, and have found insulation is also unnecessary.