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Old 02-12-2019, 11:52 PM   #1
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What is this vent for? Surveyor 247 BHDS

We have a new TT as shown above and on our first venture we encountered some cooler nightime weather. When using the bathroom I noticed alot of cool air coming out this vent in the side of the shower base.. Does anyone know what the purpose of it is? Anyway that night it had a cushion pushed up against it to stop the draft.
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Old 02-13-2019, 08:16 AM   #2
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Old 02-13-2019, 08:20 AM   #3
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It's either Heat or Cold air return for furnace......or.....Ventilation.
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Old 02-13-2019, 08:40 AM   #4
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Yes, it's for ventilation.

While it does cause a bit of a draft in the bathroom, the bathroom blower vent blows more than the floor vents.

That vent also helps keep the enclosed underbelly warm in the trailer.
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Old 02-13-2019, 10:05 AM   #5
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I was watching this thread and got to thinking.......scary in itself, but stay with me here.

Id remove the grill and see if it really is for an air vent, OR........

Because it appears to be in the base of the floor to the shower, is it just a fake cover to gain access to the P-trap area of the shower floor drain? I have an access door in this location in our Georgetown, so if this is a vent, do you have another access door to get to your P-trap?

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Old 02-13-2019, 10:26 AM   #6
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I agree with kenandterry. I would remove grill and check under shower. If it was like mine (which in my case was a solid cover), the hole in the floor under the shower was more or less open to the area under the trailer that the drain pipes, etc went through. This allowed cool air to come up under the shower pan. I stuffed the area with insulation. We haven't been out yet to see if there was an improvement, but can't hurt the situation.
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Old 02-13-2019, 02:58 PM   #7
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Mine has a metal vent cover which is an access for shower drain.
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Old 02-13-2019, 03:47 PM   #8
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Originally Posted by TheWolfPaq82 View Post
It's either Heat or Cold air return for furnace......or.....Ventilation.

The cold air return for the furnace needs to be at least 2x larger than that vent. Return air grate depends on the number of heated air outlets and needs to start at a minimum of 50 sq inches. The more outlets your rv has the larger the return needs to be. Insufficient return air will cause the furnace to overheat and cycle on limit. Another symptom of a return air problem is the furnace seems to run continuously in an effort to satisfy the thermostat.
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Old 02-13-2019, 03:54 PM   #9
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Surveyors have a heated and enclosed underbelly. The way they accomplish that is to leave a furnace duct open ended and it just dumps heat into the underbelly. On our previous RV (a Surveyor) that vent had a furnace duct about 4" behind it, so the heat kinda heated the underbelly and provided a little heat in the bathroom.

Look behind it and see if there isn't an open heat duct there.
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Old 02-14-2019, 10:35 AM   #10
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I do not know why that type of vent would be placed there except for a cold air return. I do know one thing: I would mount some screen to the inside of it to prevent it from becoming an insect highway.

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