DIY In Cabin Air Filter *solved with instructions* cost: $10

Simply push down on the center pin and then the entire clip can be lifted out. When putting these back in, pull the center pin out most of the way and then in push this center pin in when the rest of the clip is seated properly. Good luck - Don
 
Ok
So I put the napa filter In my na1, after a full inside and out detail,
And unlike before after 3 days driving interior dust is NILL!!
And fan flow same as before,
Note the filter does hang over to one side , but who cares you don't see it once the cowl top is back on!
 
After looking at the napa p/t. I notice this:
Principal Application: Toyota Echo (00-05), Scion xA, xB (04-06)

Here is the p/n for:
Purolator: A15363........................................ $10.99
Beck/Arnley: 042-1620 .................................$13.99
Drive works: DW-15363 (same as Purolator)... $11.99

Napa 6646 "................ $14.69
Wix 46646 .................$8.94 + shp (fleetfilter.com)

I'm closer to advance auto then napa.
 
Along the front of the cowl, these are a number of clips. If you gently push up the center portion of the clip from below, the diameter of the clip narrows and the clip pops out the top. IIRC, the clips are within the gasket that runs along the front lip of the cowl. DO NOT forcibly pull on the cowl or gasket otherwise it will break or the gasket will tear.

Many of my clips literally fell apart due to age. They are cheap and easy to replace. There is an aftermarket supplier and their price is reasonable so don't sweat it if the clips fall apart.
 
I just did mine. I just pop those tabs out and looked underneath. I realize my car doesn't have one so I went and got one
Napa was closed so I went to advance auto. Picked up WD 34717. I had to cut the middle out and dropped it in without removing the whole plastic cowl. I just lifted it and put it in. easy 15 mins job max.
 
If you need new cowl clips, don't pay the $3.82 each that Acura wants for them. Go here to clipsandfasteners.com and you can get 15 of them for $14.35 plus shipping.

BTW, I'm assuming that the rubber hood seal goes between the cowl and the flange and not underneath, right? Dumbass me didn't look before I pulled it off. *slaps head*
 
I just did mine. I just pop those tabs out and looked underneath. I realize my car doesn't have one so I went and got one
Napa was closed so I went to advance auto. Picked up WD 34717. I had to cut the middle out and dropped it in without removing the whole plastic cowl. I just lifted it and put it in. easy 15 mins job max.

Bro, didn't you see that redbird92 found a direct drop-in and there's multiple versions of the same filter?

Purolator: A15363........................................ $10.99
Beck/Arnley: 042-1620 .................................$13.99
Drive works: DW-15363 (same as Purolator)... $11.99

Napa 6646 ................ $14.69
Wix 46646 .................$8.94 + shipping (fleetfilter.com
)

Get any of these and there's no cutting involved. Just sayin'---
 
^^ I believe the k&n drop in filter for the cars I posted above will work with the stmpo bar. Since the k&n filter is flat. Not like all the other one which have fins that stick up..
 
Had this sitting in my house for a while. Was waiting for all the mosquitoes to die off from the cold.

Works like a champ. I put the longer fins downward and the right most fin is inside the cavity. Leaving 4 or 5 fins unused on the left.

Air flow is restricted for sure... but not enough for me to care.

This took me 5 minutes and was a piece of cake. EVERY owner should be doing this.

NSXCabinFilter.jpg
 
Works like a champ. I put the longer fins downward and the right most fin is inside the cavity. Leaving 4 or 5 fins unused on the left.


NSXCabinFilter.jpg

OK, should it matter how the filter "fins" are spaced in the opening? I think I placed mine where it's as close to centered as possible & the only reason I ask is I wonder if it "seals" properly that way as opposed to the gasket sealing it on one end. Thanks---
 
Air flow is restricted for sure...

EVERY owner should be doing this.

Took your advice and gave this a shot tonight since its super easy, cheap, and I needed an excuse to fiddle with the car. :smile:

Agree, that airflow is definitely restricted.

I'll look around for a more free flowing option and post up findings
 
Took your advice and gave this a shot tonight since its super easy, cheap, and I needed an excuse to fiddle with the car. :smile:

Agree, that airflow is definitely restricted.

I'll look around for a more free flowing option and post up findings

That would be good. What's the CFM with the NAPA filter vs the stock CFM? I would think somebody makes a HEPA filter that would fit the opening in the cowl. Maybe a vacuum cleaner filter? What's the measurement of the opening---4X6 inches? I need to go measure---
 
That would be good. What's the CFM with the NAPA filter vs the stock CFM? I would think somebody makes a HEPA filter that would fit the opening in the cowl. Maybe a vacuum cleaner filter? What's the measurement of the opening---4X6 inches? I need to go measure---

Maybe this one ? It's 4" x 6"

Kenmore EF-1 HEPA Filter
 
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That would be good. What's the CFM with the NAPA filter vs the stock CFM? I would think somebody makes a HEPA filter that would fit the opening in the cowl. Maybe a vacuum cleaner filter? What's the measurement of the opening---4X6 inches? I need to go measure---


According to redbird92 he says they are pretty close. But I like the idea of a flatter style - like the HEPA ones used for vacuums if the flow is relatively the same.
 
Interesting mod. As I came across the pic I was like... hey that look's like my air filter for my scion xA... and then I read it was.... hahaha... they both have an X in the model name so it was meant to be.... =P
 
OK, I measured the actual opening of the intake vent and it's actually 4 1/16" X 5 9/16". Gonna head to the local vacuum cleaner repair shop and measure the 4" X 6" HEPA filters they do have as most sizes are rounded up for simplicity's sake. The 2 filters I'm looking at are a Panasonic MC-V199H and a Kenmore 86889. BRB---
 
OK, I measured the actual opening of the intake vent and it's actually 4 1/16" X 5 9/16". Gonna head to the local vacuum cleaner repair shop and measure the 4" X 6" HEPA filters they do have as most sizes are rounded up for simplicity's sake. The 2 filters I'm looking at are a Panasonic MC-V199H and a Kenmore 86889. BRB---

UPDATE: The Kenmore 86889 filter DOES fit, however the corners do need to be slightly trimmed for it to drop down in there completely. On my first attempt, I cut a little too much off so I'll have to go get another filter or 2 tomorrow. What I did was I traced the outline of the intake vent on paper and transferred it to cardboard to use as a template so next time my trimming will be more precise and not a guesstimate. I also think I'll run a strip of EPT foam tape or 3M double sided foam tape around the inside of the vent so the filter will have a bit of a "ledge" to sit on to keep from getting pulled down into the duct. Anybody with any other suggestions, feel free to chime in---
 
I just looked at my [Eureka Boss] HEPA filter - HF2 which is the same size at 6" x 4.5" and you can get them with Arm/Hammer inside too. You can get these at Lowe's, Best Buy, ..... Here is a picture from the top view.

In addition to its yelow frame, it also has a rubber black seal where it rests on the vacuum verically so it may be a good option too.
 
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great tip... a good winter project. thanks folks!
 
Three questions:

1) Why? My interior doesn't seem dusty.

2) What happens when I wash my car.... god knows I don't drive it in the rain.

3) What is the outcome of the severe air restriction caused by a filter?

Just curious.
 
I am seriously considering fabricating/manufacturing an "oem fit" drop-in cabin air filter with better CFM flow characteristics and then sell em at/near cost to whoever wants them.

Had a long conversation earlier today with a custom manufacturer of HEPA and other type of filters (he makes the HEPA filters used in some commercial aircraft)

He said that the great majority of in-cabin filters are made in China and India, and that the large percentage of them are not actually HEPA filters.

He said they are usually made from the same kind of material as furnace filters with electrostatic polypropolene fibers and sometimes an active carbon layer to block odors. Said that 3M Filtrete would be a good candidate fabric to use.

If you guys wanna pursue a perfect fit drop-in option, we need get some raw non-filtered CFM numbers on the factory heater blower at standstill and also at various driving speeds.

Its gotta be good for at least 5 horsepower ; )
 
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