ventilation

[tpassmore]

replacing broken vent grill on side and noticed louvers are facing the stern vs bow. shouldn't louvers face forward to intake air? also, port side has inline blower and air hose. the starboard has vent box but no hoses or significant opening. is that proper?

 

[soggy_feet]

Re: ventilation

Do you have another on the other side of the boat?

Often times, one faces forward, one back. Suppose it helps draw air in on one side, and exhaust it on the other...

 

[Beefer]

Re: ventilation

You don't want them to face the bow, water/spray will get in there, and that won't be a good thing. There is enough airflow for the motor even with the vents facing aft. Also, I think the reason they 'blow' towards the back so that any gas fumes you are eliminating don't go back towards the cockpit area - they go away behind the boat.

 

[Frank Acampora]

Re: ventilation

Since gasoline vapors are heavier than air, they settle into the bilge. SO: On a passive ventilation system, one set of louvers face rearward to exhaust the bilge. This set has a hose (about 3 inch diameter) that reaches to the bottom of the bilge to vent vapors there. The other set of louvers face forward so movement of the boat forces air into the bilge for a slight pressurization. They do not have a hose attached.

 

[soggy_feet]

Re: ventilation

Confirms my hypothesis Frank, thanks.

 

[tpassmore]

Re: ventilation

Frank that makes sense. and so does minimizing water intrusion.

 

[KBHumphrey]

Re: ventilation

Since gasoline vapors are heavier than air, they settle into the bilge. SO: On a passive ventilation system, one set of louvers face rearward to exhaust the bilge. This set has a hose (about 3 inch diameter) that reaches to the bottom of the bilge to vent vapors there. The other set of louvers face forward so movement of the boat forces air into the bilge for a slight pressurization. They do not have a hose attached.

I was just poking around my engine area yesterday out on the lake. New-to-me boat and my first time out. My vent hose has all the wrapping stripped away so that inside the engine compartment it looks like a slinky. Is this a standard vent hose that I can replace from a big box store? Like a dryer vent hose? Or is there a special marine version that needs to be installed?

 

[sw33ttooth]

Re: ventilation

Since gasoline vapors are heavier than air, they settle into the bilge. SO: On a passive ventilation system, one set of louvers face rearward to exhaust the bilge. This set has a hose (about 3 inch diameter) that reaches to the bottom of the bilge to vent vapors there. The other set of louvers face forward so movement of the boat forces air into the bilge for a slight pressurization. They do not have a hose attached.

mine is set up like this, i also notice a tempature degree differnce running the blowers while i cruise not sure if it has to do with the blowers sucking hot air out? but its maybe 5-10 degrees cooler with them on. sorry i cant tell you if its marine or manards 3 inch tubing

 

[boaterinsd]

Re: ventilation

replacing broken vent grill on side and noticed louvers are facing the stern vs bow. shouldn't louvers face forward to intake air? also, port side has inline blower and air hose. the starboard has vent box but no hoses or significant opening. is that proper?

What purpose does the vent box serve? will a blower mount in there? Or is it just a place to hook up the hoses? Ill have to look at mine i guess.

 

[tpassmore]

Re: ventilation

What purpose does the vent box serve? will a blower mount in there? Or is it just a place to hook up the hoses? Ill have to look at mine i guess.

as stated above and makes sense, on small boat one side has blower hose the other is passive. but why is there a box? to prevent water intrusion?

 

[soggy_feet]

Re: ventilation

vent box, like, dorade box?

 

[etracer68]

Re: ventilation

KBHumphrey; drier vent hose should work fine. I have replaced mine on the Bayliners I have owned. I would replace it as soon as you can. Its very important to use your blower, before starting, and after fueling. I would always have the drain plug out, while the boat was on the trailer too, that way the fumes, if any, could get out.