HEPA Filter replacement schedule?

[NSCyber]

Interesting questions! Yes, it does bring outside air in, which is why HEPA filters are so important. Keep in mind that pulling air into the vehicle is necessary to create a positive pressure environment. Recirculating air cannot create a positive pressure room in same way that you can't pull yourself off the ground by pulling your bootstraps--you need to be constantly adding new clean air in order to create a positive pressure.

In a dangerous air situation like dense smoke or a biowepon attack, you're much better off relying on the HEPA filter + positive pressure than recirculating air without pressure to prevent unfiltered ingress from outside.

Hope that helps! In short, physics doesn't allow positive pressure in recirculation mode.

Thank you! That answered it!

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[REM]

Bio defense mode just sucks in even more outside air. Best to turn off the ac or run in recirculate mode.

Please stop instructing people to do the wrong things. Have you read the manual?

https://www.tesla.com/ownersmanual/cybertruck/en_us/GUID-CFA216A5-F2CC-416F-97E8-8560E0CC4161.html

 

[carsly]

It's like any other filter, if you've had experiences that may have clogged the filter it's best to replace it.

Traveling through wildfires/heavy smoke are usually reason enough for me to replace the filter - it's better than breathing in nanoparticles that work their way loose. Filters are cheap, compared to your lungs.

 

[bowenzhang]

High pressure inside prevents air leaking in from outside. Yet, high pressure inside requires air from outside.
If it is real bio attack, I suppose bio defense mode works, since HEPA filter would be effectively filter out virus.
if it is odor, sounds like bio defense mode would make it worse, since more air is pumped in and the filter doesn’t do much for odor.
The only way I can think of to prevent odor is to pressure up the cabin early on, and turn it off, and assume the sealing is good enough to keep pressure for a while, and pass through the hazardous air. I doubt the seal is that good though. If it is, this process wouldn’t be needed at first place.

 

[igs]

Please stop instructing people to do the wrong things. Have you read the manual?

https://www.tesla.com/ownersmanual/cybertruck/en_us/GUID-CFA216A5-F2CC-416F-97E8-8560E0CC4161.html

"and outside air is entering the cabin"

read your own quote!

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[REM]

"and outside air is entering the cabin"

read your own quote!

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"The HEPA filter ensures the best quality air inside the cabin whenever the climate control system is on and outside air is entering the cabin (recirculate is off). The HEPA filter is extremely effective at removing particles, including pollution, allergens, bacteria, pollen, mold spores, and viruses. When you engage Bioweapon Defense Mode, the positive pressure inside the cabin minimizes the amount of outside air that can enter the vehicle."

 

[igs]

"The HEPA filter ensures the best quality air inside the cabin whenever the climate control system is on and outside air is entering the cabin (recirculate is off). The HEPA filter is extremely effective at removing particles, including pollution, allergens, bacteria, pollen, mold spores, and viruses. When you engage Bioweapon Defense Mode, the positive pressure inside the cabin minimizes the amount of outside air that can enter the vehicle."

OP is complaining about odors.

 

[REM]

High pressure inside prevents air leaking in from outside. Yet, high pressure inside requires air from outside.
If it is real bio attack, I suppose bio defense mode works, since HEPA filter would be effectively filter out virus.
if it is odor, sounds like bio defense mode would make it worse, since more air is pumped in and the filter doesn’t do much for odor.
The only way I can think of to prevent odor is to pressure up the cabin early on, and turn it off, and assume the sealing is good enough to keep pressure for a while, and pass through the hazardous air. I doubt the seal is that good though. If it is, this process wouldn’t be needed at first place.

The Cybertruck isn't a pressure vessel. If you want to breathe the cleanest possible air during a wildfire, either don a SCBA kit, or turn on bioweapons defense mode where the air is being filtered through a massive activated charcoal HEPA filter before reaching your lungs.

 

[REM]

OP is complaining about odors.

HEPA filters generally catch 99.97% of particulate that are 0.3 microns in diameter or larger. If you can smell a wildfire burning, then you are picking up the expected .03% that he HEPA system didn't catch.

The Cybertruck isn't a cleanroom.

 

[igs]

HEPA filters generally catch 99.97% of particulate that are 0.3 microns in diameter or larger. If you can smell a wildfire burning, then you are picking up the expected .03% that he HEPA system didn't catch.

The Cybertruck isn't a cleanroom.

Exactly, so it's better to not pull in outside air.

 

[HaulingAss]

Interesting questions! Yes, it does bring outside air in, which is why HEPA filters are so important. Keep in mind that pulling air into the vehicle is necessary to create a positive pressure environment. Recirculating air cannot create a positive pressure room in same way that you can't pull yourself off the ground by pulling your bootstraps--you need to be constantly adding new clean air in order to create a positive pressure.

In a dangerous air situation like dense smoke or a biowepon attack, you're much better off relying on the HEPA filter + positive pressure than recirculating air without pressure to prevent unfiltered ingress from outside.

Hope that helps! In short, physics doesn't allow positive pressure in recirculation mode.

Recirculate does draw in outside air (to comply with vehicle regulations). A lot of people don't know that.

 

[HaulingAss]

HEPA filters generally catch 99.97% of particulate that are 0.3 microns in diameter or larger. If you can smell a wildfire burning, then you are picking up the expected .03% that he HEPA system didn't catch.

The Cybertruck isn't a cleanroom.

Woodsmoke also has odors that are non-particulate in nature.

 

[Hello4x]

Perfect timing for this discussion. Just saw this on x.

 

[HaulingAss]

HEPA filters generally catch 99.97% of particulate that are 0.3 microns in diameter or larger. If you can smell a wildfire burning, then you are picking up the expected .03% that he HEPA system didn't catch.

The 99.97% that you quote actually varies depending upon the pressure differential on each side of the filter. The higher the fan speed, the higher the pressure differential and the lower the filteration percentage will be. It's not a fixed number. That's why lower fan speeds can reduce the odor passed by the filter in many situations.

It's not as cut and dried as the absolutists are trying to portray it.

Recirculate can run on a very low fan speed and it's only drawing small amounts of outside air in, while filtering the already filtered (recirculated) air multiple times. As long as your windows and doors are not very leaky, this could result in the highest cabin air quality when driving through severe pollution. It really depends upon how much air leaks past the window and door seals (which would increase with the speed of the vehicle through the air). In other words, the higher the vehicle speed, the more important it is to increase the fan speed to maintain a good pressure differential.

Even recirculate creates a tiny positive cabin pressure because it is introducing a small amount of outside filtered air. However, as long as the cabin air exit portlets are open, this pressure differential would be insignificant. If the driver had a way to keep those exit portlets closed, that would reduce the amount of introduced air required to keep a certain pressure differential between the cabin and the outside (to prevent infiltration around doors and windows).

 

[bigbangbadaboom]

Not sure about you guys but I found the hepa filter not as good as my X and Y. Not sure if its because there's no cabin air filter and it's not as big? Also, I feel like the cover doesn't seal as well and the clips break so easily I ended up screwing it in.

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