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Little round Vents

Anybody know if these are any good? 

Opinions? Experience? I’m thinking there are cheaper out there on eBay.
I am not familiar with the brand or one that takes a round hole.  Huh
Compared to parenting, Cat herding is less complicated
Expensive little fookers, but neat if they work!
One gloriously stinkin' badge.
Too rich for my blood.  I'll bet Sternwake could devise an alternative yjat would cost less and be more efficient.  Probably use a computer fan.
[-] The following 1 user says Thank You to weigh2ez for this post:
  • heron (08-02-2019)
Those vents remind of boat or sailboat vents. I have one from a garage sale.  
 They are available with a tiny solar panel on them but would be very surprised if they move a lot of air with such a small panel. Maybe good to have both direct solar vent with no battery and indirect solar vent through the house battery. 
 I’m looking for side vents for a side wall. After roasting in my van I’m taking venting a lot more seriously now lol. Because of bugs I cannot rely on opening the windows or doors.
Computer fan in a toilet flange?
I have a Nicro marine mushroom vent purchased in 2001..for.-60$
Has a 4 inch aperture and small solar panel.

Rated at 1000 cubic feet per hour.

Had a C sized nicad battery to run overnight.

Fan motor started clicking.early.
Now motor is removed and streamlined for.minimum resistance.
2 counter rotating 4.75 inch computer fans force air through a step down ring.

Ill estimate they move over 100cfm together at max speed, for 0.55 amps.

The linked fan has a squirrel cage fan motor. Claims 100 cfm for 1.5 amps.

Id like a bigger version of my current roof.exhaust fan. I see nothing id buy.

Hard to beat fantastik or maxairr fans when one is willing to cut a 14 inch square hole and can be there to lower the lids in rainstorms. I dont have to worry about rain with a vent.

The rainproof lids on a van is like a giant festering pulsing pimple, waiting to be popped, in my opinion
[-] The following 1 user says Thank You to sternwake for this post:
  • weigh2ez (08-03-2019)
I have one of those pimples over my fantastic vent. Not much to look at but works great.

2000 Roadtrek 200 Versatile "The Beast" (it has been tamed hopefully)  I feed it and it doesn't bite me.   Angel
[-] The following 2 users say Thank You to B and C for this post:
  • Roadtripp (08-03-2019), Brad (08-18-2019)
I prefer to a reduce roof clutter. I just removed 3@14” pimples (opening vents) , 1@24” pimple (dome bathroom skylight), 1@6” pimple (fridge vent), and one giant wart on a 14” hole (air conditioner) from a 28 foot Motorhome. On goes solid 1/8”  aluminum roof then solar panels.
 Also removed old TV antenna and newer satellite recieved system. Only a CB antenna mount remains at the very front because it’s on the fiberglass front cap and I have not decided what to do with that section. 
  Venting is the next challenge. The fridge coils come  very close to the ceiling so a side wall vent will barely be high enough to vent. Or it can be replaced with a all electric fridge that vents inside and eliminate another hole. 
 Will keep one eye open for a bigger mushroom vent. 
 Am looking for some boat style ports to place computer fans in.
I installed one of those round ventline fans in my pickup topper.

They use a cheap 'hobby motor'....with brushes. They do the job but they are noisy, and only have one speed, and one direction.

I modified mine (of course) to have 2 speeds, and better airflow with a coarse plastic screen replacing the fine mesh bug screen.

BTW they are factory installed in Casita campers in the bath/shower.
                                                                 LIVE! from the apocalypse!

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