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Old 03-31-2015, 11:49 AM   #11
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Ashley - thank you for the report. Even thou the db meter on the iPhone may not be entirely accurate for precise measurements, it was good enough to provide an objective measurement that did show a level decrease.
In sound measurement, near silence is 0 db and a sound 10x louder is 10 db. A sound 100x louder is 20 db due to the logarithmic function of the decibel. I will use the iPhone decibel app to measure before and after the install.
I did get into the camper today and verified I have a Ventline so install should be fairly easy.
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Old 04-01-2015, 09:21 AM   #12
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Ashley - thank you for the report. Even thou the db meter on the iPhone may not be entirely accurate for precise measurements, it was good enough to provide an objective measurement that did show a level decrease.
In sound measurement, near silence is 0 db and a sound 10x louder is 10 db. A sound 100x louder is 20 db due to the logarithmic function of the decibel. I will use the iPhone decibel app to measure before and after the install.
I did get into the camper today and verified I have a Ventline so install should be fairly easy.
Each 3db doubles the power, but we aren't talking watts; rather sound or in this case noise. And thanks Ashley!

Bell Labs came up with this easy logarithmic way to measure or calculate sound through a media, such as air or wire; loss through the transmission, actually. It is a ratio to power in to power out; zero isn't the absence of sound, but a reference or staring point. In the telecom world we consider the characteristics of the human ear; call it dba and state 1000hz at 1mw is 0db. With noise, in the air, it is a bit different.

The average home is about 40dbm... rustling leaves 10dbm... a jet at take off 120dbm. So the jet 12 times or 120 times louder than the leaves... no. Its a trillions time "louder".

From the old fan to the new one what does a reduction of 20dbm mean.

So Ashley your 40dbm might be a bit high if nothing is running in the trailer. The 80dbm from the old vent sounds slightly high, this would be about the sound in a closed car on the interstate, The reduction in noise to the new would make that about as loud as normal conversation. Which means the old fan would be competing with actual conversation, but moving away from the new one, there would be no competition to what you might be listening to.

Placing the "meter" on the counter, if you did, could cause higher readings. It should be around head height and farther way, but if it was the same for all three tests, it might be a good comparison.

The new fan producing 50dbm is believable, but not registering a higher reading with the new fan on high; not so much. I would think 60dbm in high would still be good.

So, the issue becomes how to interpret the numbers. 20dbm difference would indicate to me that the noise was reduced to a point around normal converstation from one more like a closed car on the interstate. It is quieter on high as the old one was running and it moves more air on its low setting. A good product for sure.
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Old 04-13-2015, 08:10 AM   #13
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Just to followup....I did the install of the SAM-1 over the weekend and here are some notes.

The unit replaced was a Ventline so the installation was very straightforward and followed the instructions and pictures closely. Some relevant notes:

1. Install time was 1 hr 20 min as I took my time and also had to get a vacuum to clean up sawdust on the top of the hood unit.
2. I would suggest that a note be added to the instructions to turn off the 12 Vdc when doing the install. Even though a shock hazard does not exist for 12 vdc, an arc can be created if the hot lead touches anything metal that is grounded. An arc can also be created if wire strippers contact metal while stripping the insulation.
3. I did not install the new vent cover. The reason is that the supplied screws are silver and I would prefer black headed screws as that would be a more aesthetically pleasing installation. I will either paint the screw heads black or find black screws to use for that install.
4. I have a sound level meter app on my iPhone. While not precisely accurate, it does show a measureable sound level change between the original fan and the SAM-1 fan.
Original Fan 72 db
SAM-1 Fan on low 58 db
SAM-1 Fan on medium 60 db
SAM-1 Fan on high 62 db
Background was 48 db
5. The other noticeable improvement was in airflow. With original fan, the outside vent flap would barely open about Ĺ in. With SAM-1 on low the outside vent opens as wide as it can, about 1.5 inches.

Overall, I am pleased with the installation and operation of the unit. I will be camping the week of April 27 so that will be the first “field testing” of the unit.
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Old 04-13-2015, 08:55 AM   #14
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Short followup: I washed my trailer Saturday and realized how open the FOP provided outside vent is to allow water to get in. So, I went back to the original outside vent the Toyhauler had. It like a scoop with the open end facing down (sorry no pics) I did remove the flapper, to give a little more air flow. You would have to run a hose up under the lid to get water in there even without the flapper; plus the FOP vent has a manual flapper with the handle inside.
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Old 04-13-2015, 09:08 AM   #15
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Short followup: I washed my trailer Saturday and realized how open the FOP provided outside vent is to allow water to get in. So, I went back to the original outside vent the Toyhauler had. It like a scoop with the open end facing down (sorry no pics) I did remove the flapper, to give a little more air flow. You would have to run a hose up under the lid to get water in there even without the flapper; plus the FOP vent has a manual flapper with the handle inside.
That was exactly my concern too and why I chose to leave my factory outside vent cover in place. The outside vent provided with the kit is the one weakness I personally would say they have, other than that I love mine and am very satisfied with the upgrade. Glad to see I wasn't just over thinking their design of the exterior vent.
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Old 04-13-2015, 09:12 AM   #16
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Excellent point on the vent. I am going to leave the original one on with the flap in place. Used to unlatching and latching it so not a big deal.
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Old 04-13-2015, 09:41 AM   #17
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Excellent point on the vent. I am going to leave the original one on with the flap in place. Used to unlatching and latching it so not a big deal.
This is what OC did as well. And, he ripped the flapper out, too. It could be fairly difficult to get the "duct" outlet to fit into the outside cover without removing it, and one might need a helper.
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Old 04-13-2015, 09:48 AM   #18
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I have the original vent as well, about to rip the flapper out as well.
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Old 04-13-2015, 03:54 PM   #19
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My concern with ripping out the flapper would be that without some sort of screen it could become an insect nest area, especially if parked for awhile without any use. Imagine being outside, relaxing in a chair near the vent, and DW turns it on and a swarm of bees comes out!
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Old 04-13-2015, 04:18 PM   #20
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My concern with ripping out the flapper would be that without some sort of screen it could become an insect nest area, especially if parked for awhile without any use. Imagine being outside, relaxing in a chair near the vent, and DW turns it on and a swarm of bees comes out!
The unit comes with a vent shut off that is operated from inside. No need for the outer flap.
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