I made a similar setup for my sunroof but with only one giant 5V noctua fan plugged directly into a battery bank. For the rear windows, I used blackouts made of reflectix with black cloth and some gutter guards glued on the top. With window rainguards, it was pretty much invisible from the outside and kept us comfortable during warm nights. We also had fans inside the car to help with really warm nights.

Your exhaust fans can only expell as much air as your intake fans let into the vehicle - if they'd push out more air, they'd create a vaccuum. For maximum efficiency (noise as well as power consumption), intake and exhaust volumes should be evenly matched. To further reduce noise and increase power efficiency, consider how much airflow you really need. The vehicle's interior volume is not that big. Let's say the volume is 4 cubic meters (which is almost certainly an over-estimatation), to refresh all the air in the vehicle once every minute, you'd only need a capacity of 240 m3/h or about 140CFM.

As a 3D Printer myself, and as a recent Honda Element owner with big plans for travel next seasons, I can totally appreciate the amount of work that goes into making such things for my own vehicle. Thanks for sharing! I'll be sure to be doing something like this setup!

Thanks for another awesome video Matt. As a homeless veteran living in my vehicle your designs have inspired me. I do know CFMs from working in HVAC so your airflow looks plentiful for the size of the cabin in your vehicle. 400CFM would be considered 1Ton of heating/cooling capacity. Imagine pushing 400 basketballs a minute of air through your car that mix to help bring the temperature average down.

I made a setup for my camper shell that pulls in air from the front pass through window and vents it out the side windows. Absolute game changer!

My car has a similar system. It has a hidden blower fan installed in the dash. It pulls air from a weather protected vent, has vents throughout the vehicle that can be directed where needed, and is powered by a huge battery under the hood. My car actually came with it from the factory! I think yours might have this system too 😂 Just kidding, this is super awesome and I loved seeing your creative process. The reason I said that above was I stumbled on a video of a guy that was building out a van and didn’t want to cut a hole in his roof, and he utilized the factory blower fan. He tapped into the blower fan circuit and controlled and powered it with his battery bank, independently of the factory wiring. It still worked like normal, but when the car was off he could flip his switch in the back and it turned on his fan. Pretty smart, on a budget especially!

Try it out with just the exhaust fans. Buy the rain guards for all the windows and just leave them open an inch or two.

You are a freaking genius Matt. Most under-rated channel on KZfaq.

most cars have a build in vent in the rear! it lets pressure escape so that when you open a window on the highway it doesnt blow your sunroof to the moon, its quite possible by keeping a positive pressure in the cabin area these vents would react by letting out the extra pressure! great build! feel i learned plenty for my own challenges! thanks

This is just way too cool! Now I just need to grab my Sawzall and cut a sunroof in the roof of my 4runner! Greg

uh, might want to swap your window fans with your vent fans. You want to be pulling positive pressure inside your car, not negative pressure. helps to keep dust and stuff out

I always look forward to your videos; yet another great design! Thanks for sharing the design and documenting the process. 👍

Matt, I love your videos! I, too, love to over-engineer every aspect of my build, but you're next-level. Please keep them coming. Would love to see more of what you've done!

Re: the spicy youtube comments at the beginning. They're mistaking their own experience for yours. Personally, I love what you're doing, and at least 3.1k others agree

CFM: Cubic Feet per Min. Volume of air in feet, could be and liner measurement eg CC, Yards, cubits as long as you get it cubed. I would put some Gaffer tape on the tiny bolts against the window so it doesn't scratch it or rip-up the tint. Excellent as usual, I love your sarcastic? humor, it's motivating. I look forward to each one, well the ones I like, Lol. Safe Travels buddy!

Great job on the video Matt! Thanks for making it.

Genius system. Please Keep making more videos!!

This channel rocks! Thanks man!

Really enjoy your videos. While this setup is overkill for my needs, i can easily downsize the fans, etc. like you mentioned. Thank you for sharing. The peeping window is a good idea. Cheers.

First video of your's that has been recommended to me. Instant subscribe, thanks for posting.

Exactly what I was after - thanks so much for such a comprehensive video.

I found your channel today from your old ventilation video and today I also found out you made this cool update to the system just uploaded like 2 days ago, please post more. 🎉🎉🎉

In such a small space as a vehicle I would either push or pull the air but not both, which ever way I would think a hood system to block rain with insect screen would be less complicated and less expensive. One important thing to know about airflow is you can't exhaust more than you can pull in and vice versa

Most of your airflow is actually getting blocked by your window coverings. Your window fan units are rated at 35 CFM each and not sure if they are even delivering that much due to the gap size. So in essence you have 70 cfm entering and 300 cfm trying to suck but you're not getting that 300, at most you're getting around 70 cfm +/-. Also you can't add the intake and exhaust together for an entire system and rate it at 370 cfm since it can't deliver that. If you remove air faster than replacing then you will have a negative pressure in the cabin and if you're putting more air in than removing then you will end up with positive pressure in the space. Typically when cooling, you will have a better experience with a negative pressure system think about attic fans in a house. If you adjust your window coverings to have a gap for fresh air and remove the fan altogether it will keep your car cooler than with the system you have now due to restrictions of those window fans and the size of gap you currently have. Finally to get the air to be replaced and not take a short cut from the window to the sunroof, you can always use a drop cloth or something similar between against the roof and drop down behind the front seats until about 6 inches from the floor. This would require the air to circulate down first then around the curtain and back up. Then you could use your window fans now to cycle air from front to back behind the front seats.

Only upgrade I'd recommend, ability to make either side window fan exhaust. Easiest (but more costly, probably) add a second fan to the window units blowing out. In my brain this should still give you air circulation in less than great weather. As long as the intake and exhaust are spaced apart, you shouldn't get any short cycling. Keep a more powerful fan for exhaust to force the air out further. For my application (but I'll probably never build) I don't have a sunroof. I do have two rear windows that pop out with a manual clip. Definitely got my creative juices flowing. Love your videos.

This content is brilliant. Cheers Matt

Matt, mate i salute you.... this is goodness beyond the normal. thank you

I really like your ideas. They actually inspired me to try the moon roof one on my camping Range Rover. I actually used a small usb outlet solar panel and leave the roof cracked so it kept the vehicle well vented in the hot days when parked. And reconnect the fan to a power bank in the nights when camping. Great job and glad you are keeping it evolving :)

I love 'crafting' things. I love road trips. I'll be using some of your ideas. Thanks for making your videos fun to watch.

This is good, now can you find a way to filter the incoming air? This is a must for urban camping in places that might be polluted, or places where once is temporarily forced to camp.

Paint the car white, It drastically reduces internal temperature of car

I like to think of a CFM as a beach ball of air. It's one Cubic Feet of air per Minute.

Love your modifications 👍

Thanks for all of these genius window treatments. I'm converting a 2003 Honda Odyssey and ventilation is a serious problem. It only has the driver/passenger windows and two small vents in the rear windows. And that's it. I'm seriously considering cutting a hole in the roof to put an RV fan in. The part that scares me is trying to remove the headliner. Fortunately I plan to drive it till it dies or sell it as a camper so I'm not concerned about punching a few holes in it. Subscribed!

Love the book as well as the amazing video.

Wow! Just the techie I needed to learn from. Just subscribed. 😃

Thank so much.

Excellent, thanks for sharing!

so freaking pumped everytime you make a video, I just litterally mounted something to my strut roof rack thanks to you!

Thank you 💯

Gonna need way more videos you do a great job

OMG Instantly SUBBED!!!! You’re great Matt!!! ❤

Thank you sir, that gives me an idea

pretty darn awesome

Great video!

This is really very useful

Dude. You are such an inspiration. Thank you for your creations!

Thanks so much for your videos! I've learned so much and you make it seem so easy! I just went through 2 cancer treatments in 6 months and I'm ready to start planning (and building) for a life filled with adventure!

I may very well need to reference this again

Great stuff! Subscribed!

You are amazing my dude!!!

I have a 2022 CRV Hybrid I use for weekend/travel overnighting occasionally! I absolutely love all your creative hacks! New sub, tyvm for sharing-Lisa👍

The side window units are the neatest to see built, but they're a bit redundant now that there's a beefy sunroof unit. If it weren't for such a nice 'snorked' breeze position, I'd think they'd mostly just get in the way vs removing them.

Glue magnets inside of a sunroof wind deflector to make the sunroof more rain-proof. You can lay bug screen down and the magnetized sunroof deflector will hold down half while magnets can hold the rest.

Fun! Cool to see your creativity and ingenuity. What you can accomplish with the right tools is quite impressive.

Yes I will buy

Happy to stumble across your channel. I’ve got these phantek fans kicking around might have to give it a whirl

Have you thought of vacuum forming? There’s plenty of diy shop-vac videos, your snorkel might be constricting air flow due to size. A vacuum former may help maximize efficiency.

amazing!!!

with my set up of an bug out vehicle, due to hurricanes and the like, i find this an excellent idea. i would love to see a video of it working real time out in the field. because we all know it is how it really functions.

This is a game changer for car camping!!!

If you use a usbc pd Bank, you can get 12v out. You can over volt fans slightly. 12v is optional on the pd specification, and I've noticed anker isn't the biggest fan of 12v on a lot of their products

If you car camp in a Prius 2014 and before that time, with the nickel battery, just hit ac button and set temperature, and you have a really comfortable night. I did it for 3 months in really cold and then hot temps. After 2014 they installed lithium batteries which have trouble starting in the cold temps. Just an idea. Although with your idea, you could do that in any car!

To minimize noise on the top fans you shiuld add a small spacer between the fan filter and the fans themselves. Noctua makes one specifically for their fans and are known to be the best PC fans out there if you don't care about RGB

Underated channel very transparent love your videos +1sub

Would probably be easier to utilize the car's factory HVAC fans and just wire them to run off a 2nd power source and the window vent can be the exhaust.

I really appreciate that you read the user feedback and then took the time to update and remake this tutorial. The mark of a true designer! (And also you give your plans out for free?? Thank you so much!!) I'm converting my Cube into a little camper van for scuba trips around the southeast and I was worried about the moisture problem inside the car. (Moist environment + Moist diving gear = A very bad and moist time.) My university has 3D printers for student use, so I'm going to try this out and see how it goes! Thanks again!

Air exchange, great! Now if air could be taken from under the car to the inside, it would be much cooler. The other is to design a swamp cooler for cars, this design is almost there, just need a damp cloth to draw air through, and a drip system to keep the cloth damp.

On the topic of wanting to dispell heat from the switch, I'd put some bumpers between it and the ABS

None of those fans move rated CFM with the amount of restrictions you're putting in place. Still a neat idea I havent seen before.

First video i saw and damn thats so cool. I dont need to camp in my car but ideas ideas ideas

Just bought all of the parts. Look forward to seeing how this works in the Virginia Heat 😬

Cool!

Bro top notch jimmy rigging!

I'm subscribing just for the "Hitchhiker's Guide" shot...

The problem with your batteries is likely because the fans are not drawing enough current and it is auto shutting down. Also you need flux to help with your soldering skills. Do not using plumbing flux on electronics. I recommend Kester 2331-ZX but this requires washing after because its conductive and slightly corrosive...but Kester 182 is another good rosin based option.

I need that lil fogger/smoke machine.

with the 12volt fans i would have used USBc PD and the highest wattage availible with a little voltage selection board

can't wait til you update to the san Ace or Delta 12V fans that are 200+ CFM. It's only a low dB level of 50+

wesome invention and video! Crazy good editing!! Mysetup is pretty jank, but i could make it better if lil suction cups stick to avs plastic.🤔

Awesome video! I recently made the V1 collapsible platform for my CRV and love it. Thanks so much for the plans. I do have a question for you. Will the battery pack you use for your window (26800 PD) run your sunroof? I know you said your sunroof battery will not run your window. I already own the 26800 PD and I’m hoping to use it for the sunroof, if it works. Thanks!

Neat.

you need to make a hood in the upper part on the same window, and you need to open the roof

I love this video! Thanks for the great design ideas. Just one thing that I would like to comment on. Your current design appears to produce negative air pressure. That is, the air pressure inside the vehicle might be lower than the outside air pressure. The potential problem with that is dust and pollen could end up gathering inside eventually, especially during pollen season. I don't know if you consider this an issue or not, but positive air pressure would be ideal.

*I'm totally going to build this for my truck. Hopefully the rear center window has enough CFM.*

Hint: when you solder use Blu Tack to hold parts in place.

This would just fail in southern hot states. At night the heat indexes are still in the high 90’s with the heat and nasty humidity. You’d need a full sized box fan just to breath as you sleep in your sweat drenched clothes

11:28 That Marcus guy has some good insights huh?

Your battery has an overcurrent protection and shuts off to protect the battery from catching fire.

@5:08 HAHAH Perfect. But seriously, pay this man

ABS or PETG+ on the 3D printer. way better for dealing with high temps in a vehicle

All though the system was very well made, I can tell your not a big car guy. Most vehicles built since 2000 had an abs vent built in the rear of the vehicle, for cars and SUVs it’s usually placed in the side of the cabin area with the vent hidden behind the rear bumper valance. For trucks it’s usual on the rear wall of the cab below the trucks bed line. These vents are large enough to pull and push air with your large fans. There is normally a vent on both side of the vehicle so it’s just a matter of run one pulling and one pushing to circulate the air. The idea is to prevent the cabin area from becoming a giant air brake if your driving down the road at like 65mph with a window down.

I love it. could you provide name of the fans, cables, switch and battery?

Coooool…. Now if you were closer so i could help make stuff. I like the roof idea. Could fit most makes n models if it was adjustable or with attachments for each size. Most sunroofs are similar sizes right?

I just really like the sunroof design and function to having to get those huge rooftop fan systems…. Thou I’d probably leave my sunroof open during the night and storms roll in, what if the sunroof fans was intake comepared to exhaust?

So that anker battery pack turns off because of the low power going through it. It turns off to save it's battery. I think if you long hold the button it turns that feature off. Either that or like double tap it. Once of the little LEDs should change color.

Do you really need to add fans to the side windows if you already have the 300cfm fans in the sunroof? You’d probably just need vents? Assuming a closed cabin, the air being pushed out of the sunroof would cause a decrease in air pressure which would then suck in air from the side windows so the side window fans may not be needed if you want to simplify things in the future.

Amazing Thinking. I want to ask you about the small and handy device which is producing smoke. where can I get it?

Looks like you could modify an old cell phone case for that 3D part that redirects the air.

You should try printing with PETG. It is much more heat resistant than PLA.