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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.
thanks,
Picture attached..

Darrell
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Old 02-13-2019, 08:16 AM   #2
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Ventilation
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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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Quote:
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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Old 02-14-2019, 11:07 AM   #11
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vent cover

You can either ask the dealers service department or try this to see if it'e a cold air return. Turn the furnace on and when it's running strong, light a match or small piece of paper, blow out the flame, and then hold the smoking paper near the vent. If the smoke gets drawn into the vent then it's a good possibility you have a cold air return.
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Old 02-14-2019, 11:25 AM   #12
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Just my simple thinking, but having used this exact model in cooler conditions with the furnace going I think it's just the vent for the cabin's warm air to "heat" the underbelly.

I highly doubt that this specific model has the following 2 things:
1. A heat duct simply emptying into the underbelly. (The brochure says "Heated and Enclosed Underbelly (Model Specific)"...it doesn't say HOW the underbelly is heated)
2. A cold air return ducted through the underbelly.

My 2 doubts come from the fact that the air induction for the furnace is on the side of the furnace and not ducted through the trailer. It doesn't have a cold air return because it sucks air directly from the cabin floor to heat it.

Here's a pic of that furnace induction or cold air return:
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And, when in the bathroom with the furnace off, you can feel the cool air coming in from the underbelly; however, when the furnace is on, the bathroom duct pushes substantially more air causing it to escape through that vent to the underbelly. If it was a cold air return, that vent would be tied to the duct work and not cause a constant cold air draft.
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Old 02-14-2019, 12:42 PM   #13
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We have a Surveyor 293RLTS with a similar vent on bottom of shower. Inside there is an insulated flex duct line providing heat to this vent. Maybe yours has become unhooked?
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Old 02-14-2019, 12:49 PM   #14
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Originally Posted by bdarroch View Post
We have a Surveyor 293RLTS with a similar vent on bottom of shower. Inside there is an insulated flex duct line providing heat to this vent. Maybe yours has become unhooked?
Do you have any other ducting or heat vents in that bathroom?
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Old 02-15-2019, 01:29 PM   #15
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Vent Question Solved

After all the great suggestions I received I decided to remove 4 screws and see what was happening.. pretty simple right..

Behind the grill was the trap for the shower and also a cutout so the underbelly could receive conditioned air from the cabin for heating.

Anyway seems like all is in order.

By the way the screen suggestion is great to keep bugs and critters out and still allow venting. I think I will take it one step further though since we are in a moderate climate here in Calif. and place a block of foam rubber in the cutout as well to prevent the drafts when the underbelly heating is not necessary.

Thanks for all the help.. here is a picture of the inside.

D
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Old 02-15-2019, 10:14 PM   #16
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The cutout in the floor directly under the trap is because the trap would not fit in the space because of its length. Also the "vent" with the four screws is cut there to allow the installer to attach the drains once the shower is set in place. Our 2018 Surveyor 243RBS has a solid cover for access to the drain and about the same size cutout in the floor. Just thought I would add my two cents worth to the discussion
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Old 02-20-2019, 10:24 AM   #17
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This is the only duct in the bathroom area.
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Old 02-27-2019, 09:43 PM   #18
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What is this vent for? Surveyor 247 BHDS

We cut a piece of insulation and covered the opening. We also noticed that the wall between the bathroom and our outside kitchen under the counter top leaks cold air, I started to fix this with silicon but then realized that a little air moving back and forth was not a bad thing. In your situation since that space below the floor in insulated you shouldn't get that much air. I have thought about replacing the grill at the base of the shower with a vent that you could close. There may be some advantage in having air flow so condensation can evaporate. Hope his makes since
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Old 02-28-2019, 05:14 PM   #19
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Looks like a fancy access opening for the plumbing under the shower pan.
Mine has a piece of wall paneling over the same area.
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