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Bosch HEPA Cabin Filter Airflow #5424309 05/08/20 06:55 PM
Joined: Oct 2017
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HowAboutThis Offline OP
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Anyone used the Bosch HEPA cabin filters? I got one due to the pollen and such but was just driving today in the 90° heat thinking my wife's car needed the fan up too high. I asked her if it was normal to need it that high and she didn't know. Anyway, is this bad for the fan motor or anything? Otherwise, the filtration is supposedly pretty good...just curious if I'm imagining less flow or if it's something known.

Re: Bosch HEPA Cabin Filter Airflow [Re: HowAboutThis] #5424315 05/08/20 07:09 PM
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Rand Offline
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Yes its real, really restricts flow.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: Bosch HEPA Cabin Filter Airflow [Re: HowAboutThis] #5424323 05/08/20 07:33 PM
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UG_Passat Offline
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Originally Posted by HowAboutThis
Anyone used the Bosch HEPA cabin filters? I got one due to the pollen and such but was just driving today in the 90° heat thinking my wife's car needed the fan up too high. I asked her if it was normal to need it that high and she didn't know. Anyway, is this bad for the fan motor or anything? Otherwise, the filtration is supposedly pretty good...just curious if I'm imagining less flow or if it's something known.


Used it once... never again. Restricts too much airflow, and then after 10,000 miles it's completely plugged up with no air flow.


2016 VW Tiguan|APR Stage 1|Neuspeed P-Flo|Osram CBI|Redline 5w30
Re: Bosch HEPA Cabin Filter Airflow [Re: HowAboutThis] #5424327 05/08/20 07:48 PM
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dippschtick Offline
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Yep! Been down this road before. It's why I try to stick to OEM as much as possible.

Re: Bosch HEPA Cabin Filter Airflow [Re: HowAboutThis] #5424348 05/08/20 08:44 PM
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motts Offline
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They are horrible!

Re: Bosch HEPA Cabin Filter Airflow [Re: motts] #5424387 05/08/20 10:09 PM
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HowAboutThis Offline OP
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Originally Posted by motts
They are horrible!



Kind of seems like it. Anyone know...is it bad on the system/fan motor or just annoying because it restricts flow so much?

Re: Bosch HEPA Cabin Filter Airflow [Re: HowAboutThis] #5424490 05/09/20 07:01 AM
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Kira Offline
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Bad, I suppose, if any motor has to run full speed all the time. It's life is shortened.

Is a shrouded fan spinning away suffering? It's not like filling a blender with rocks and turning it on.

However, is a degree of airflow needed for cooling of the fan itself?

So many posts mention, "straining the motor if the CAF isn't clean", but nobody explains why.

Re: Bosch HEPA Cabin Filter Airflow [Re: HowAboutThis] #5424521 05/09/20 07:52 AM
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knerml Offline
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Agree


2015 Hyundai Elantra Sport 2.0 GDI Mobil 1 5W30 & OEM Filter
2018 Hyundai Santa Fe Sport AWD 2.0T Castrol Edge 5W40 & OEM Filter
Re: Bosch HEPA Cabin Filter Airflow [Re: Kira] #5424638 05/09/20 10:13 AM
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HowAboutThis Offline OP
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Originally Posted by Kira
Bad, I suppose, if any motor has to run full speed all the time. It's life is shortened.

Is a shrouded fan spinning away suffering? It's not like filling a blender with rocks and turning it on.

However, is a degree of airflow needed for cooling of the fan itself?

So many posts mention, "straining the motor if the CAF isn't clean", but nobody explains why.


I've been Googling about burning the fan motor out. I found one site that said it probably won't affect the motor because...said something about resistance and blah blah. But then all the other sites talk about clogged filters possibly shortening the life of the motor because it is working harder. Well, obviously this filter seems to be the equivalent of a clogged filter given air doesn't seem to move through it. Aside from a higher fan speed wearing a motor faster will the added resriction of air shorten it's life? Let's assume I drove with my fan on speed 4 with a normal air filter all the time and speed 4 with this and just accepted my car being hotter. Will the filter airflow restriction itself cause issues other than annoyance? So another way of asking, if I'm ok driving in a sweatmobile, because the cleaner air means a lot to me, is the airflow struggle going to kill my HVAC system?

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