Do DL CRJ's have HEPA filters?
Sep 12, 2020, 2:27 pm
#16
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Or multiple horses described as an "a" word by others posters who see their rather rude and mean-spirited behavior...
Sorry I'm not an engineer but the way the explanation was worded, it sounded like the -200 was worse. I quote:
"On a CRJ700/900 there are recirc fans that take the some cabin air and mix it back with air from the packs. After the recirc fans pull air from the cabin, the air goes through a HEPA filter before mixing with the air coming from the packs. On the 200, a hepa filter is not used because there is no recirc fans on the aircraft. The cabin air is sent through exhaust ducting into the avionics bay to cool the computers before being ducted outside through the out flow valve."
Sorry I'm not an engineer but the way the explanation was worded, it sounded like the -200 was worse. I quote:
"On a CRJ700/900 there are recirc fans that take the some cabin air and mix it back with air from the packs. After the recirc fans pull air from the cabin, the air goes through a HEPA filter before mixing with the air coming from the packs. On the 200, a hepa filter is not used because there is no recirc fans on the aircraft. The cabin air is sent through exhaust ducting into the avionics bay to cool the computers before being ducted outside through the out flow valve."
Sep 12, 2020, 3:41 pm
#17
Join Date: Jun 2013
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Or multiple horses described as an "a" word by others posters who see their rather rude and mean-spirited behavior...
Sorry I'm not an engineer but the way the explanation was worded, it sounded like the -200 was worse. I quote:
"On a CRJ700/900 there are recirc fans that take the some cabin air and mix it back with air from the packs. After the recirc fans pull air from the cabin, the air goes through a HEPA filter before mixing with the air coming from the packs. On the 200, a hepa filter is not used because there is no recirc fans on the aircraft. The cabin air is sent through exhaust ducting into the avionics bay to cool the computers before being ducted outside through the out flow valve."
Sorry I'm not an engineer but the way the explanation was worded, it sounded like the -200 was worse. I quote:
"On a CRJ700/900 there are recirc fans that take the some cabin air and mix it back with air from the packs. After the recirc fans pull air from the cabin, the air goes through a HEPA filter before mixing with the air coming from the packs. On the 200, a hepa filter is not used because there is no recirc fans on the aircraft. The cabin air is sent through exhaust ducting into the avionics bay to cool the computers before being ducted outside through the out flow valve."
Sep 12, 2020, 5:17 pm
#19
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Can airline seats and their surfaces catch Covid? Nope yet airlines have changed their cleaning procedures because if you touch a surface where the virus is still active, such surface won't catch the virus but you may if you then touch your nose, for instance. Did I say that right to you? 
Sep 12, 2020, 6:07 pm
#20
Join Date: Nov 2009
Posts: 1,601
Can airline seats and their surfaces catch Covid? Nope yet airlines have changed their cleaning procedures because if you touch a surface where the virus is still active, such surface won't catch the virus but you may if you then touch your nose, for instance. Did I say that right to you?
I wouldn't do that if I were you.....
Sep 12, 2020, 7:41 pm
#21
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Sep 14, 2020, 6:00 am
#23
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the same in depth explanation gave but with pictures
https://www.youtube.com/watch?v=Z53BP65un2Y
https://www.youtube.com/watch?v=Z53BP65un2Y
Sep 14, 2020, 2:06 pm
#25
Join Date: Sep 2016
Location: Detroit, MI
Posts: 341
You would need to research how long covid can last on that type of surface. But what I can tell you is no one in their right mind ever changes one of those with out wearing gloves and a mask. If you have ever seen a used aircraft filter you would understand why
Sep 14, 2020, 2:11 pm
#26
Formerly known as scootr29
Join Date: Apr 2010
Posts: 976
So much mis-information at this point who can you believe.
Sep 14, 2020, 2:13 pm
#27
Join Date: Sep 2016
Location: Detroit, MI
Posts: 341
Sep 18, 2020, 3:07 pm
#28
Join Date: Sep 2012
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Posts: 755
the same in depth explanation gave but with pictures
https://www.youtube.com/watch?v=Z53BP65un2Y
https://www.youtube.com/watch?v=Z53BP65un2Y
Sep 18, 2020, 3:17 pm
#29
Join Date: Sep 2016
Location: Detroit, MI
Posts: 341
Thanks for the detailed explanation mtrainer! My interpretation of the flow diagram in the video is that the air also flows from the ceiling to return vents in the floor--is that correct? In that case, it's not like all of the air from the back of the aircraft is going toward the front before getting exhausted and getting progressively more "contaminated". It would be almost as if everyone had their own "bubble" of fresh airflow.