Engine Room makeup air vent filter media?

Can anyone help spec what filter material is used for engine room air intakes? It must be some type of material that is de-mist, colescence salt separating. To clarify these are the louvered vents that are installed in the hull to bring outside air into the engine room. Mine were severely damaged with age and a minor fire and I would like to source the proper material.

I have basically a starboard frame with some type of plastic filter media (resembles Hog hair or spun polly type filters) that mounts inside the engine room into a box that allows the separated water to drain. This is on a 45 sportfisher type. and pond filter media looks similar too.

similar to this is what I have -
https://store.directsupply.com/Product/filter-hogs-hair-20x20x2-20952720?quantity=1

 

I think that these air intake filters must be among the very best. However they are a lot more complicated (and a lot more expensive) than your filters.
They are fitted on the RNLI lifeboats in the UK, along with many commercial craft.
Single stage air water separators - Premaberg Manufacturing Limited https://premaberg.com/product-overview/single-stage-air-water-separators/

 

Hi ShaneB,

Welcome to the Forum.

I would question the necessity of quality air filtration to your engine room.
You have air filters on your engine(s), right?

Sounds like you've already got dorade boxes to separate out water.

 

Yes the boat is equipped with dorade boxes. These “filters” are part of that by the oem. There are separate air intake filters on the engines themselves. I’m not finding any solid info on what the manufacturer (Silverton) may have used. I may just choose synthetic hogs hair if I can’t get a more concrete answer. I’ve asked in a few forums and groups with no real success. I do t see the need to pay a bunch of money eh to have a custom metal demister made when the oem filters look like they should cost no more than $100 for a roll to do both.
Any ideas who or where I may find a more concrete answer?

 

Nope, sorry.

Did you find BajanSailor's link helpful?

 

Hi Shane, try industries which use air filter media in bulk, like spray painter supplies, for the spray booth filter; motorcycle mechanics or suppliers, especially for DIY dirt bikes air filters; hotrodder supplies for custom made air filters; air conditioning place; oven/stove hood filter; rubber / foam supplier; must be others. Look for substitute material in a hardware store, like mats, or fabrics.
You could make your own fire resistant filter medium from an old woolen jumper. Anyway that's my 2 cents.

 

so far no definitive information. a roll of HVAC course Hogs hair, Merv 4 or 5 rating seems to be the only option that turns up.

 

Engine room air intake filters for boats like your 45’ sportfisher are typically spun polyester or synthetic fiber mats in a plastic frame, designed to remove salt spray, mist, and large particles. Pond filter media with coarse synthetic fibers can be a temporary replacement, but marine coalescing filter pads are the proper material to use.

 

any sources you know of for the coalescing filter media? All I’ve found are direct me to custom louvre designs and expensive custom products.