A/C Plenum Again

[Sherman Moore]

I noticed there is no duct work for the return air. Just a grill under the sink with an open area to the coil. Is this common? Should I fabricate some type of vent to allow for proper filtering? Or not worry about because there is limited dust on the water?
Boat is a 1989 340 EC that HAD factory air. All suggestions, help advise or polictical commentary welcome.

 

[JVM225]

Mine just has a vent for the unit also.

 

[Iprof]

My 300 has a filter.

 

[flarepoman]

I had to put a new unit in about 3 years ago. For some reason there is a lot of dust-lint on a boat. I made clips and put sponge foam on the A/C unit and clip the filter to it. Since I am in FL I use it alot. I change the filter about once a month. Home depot supplys all the parts.
Not to hard to do ,but if you don't keep the evaporator clean it will slow the air flow down.

Rick

 

[Alegria]

Mine is just open air too. But the compartment the A/C is mounted in is closed off on all four sides. There is an access hatch that fits the compartment pretty securely. There is a filter in the grill that catches all the dust which needs to be cleaned.