fix
DIY Cat Litter Box Ventilation System
Posted by Gina Trapani at 8:00 AM on September 28, 2008
Cat-lover Alan couldn't stand the stink of the litter box in the garage, so he built in a bathroom fan that vents out the side of the house. To smarten up the system, his Mac mini automates the whole business so it's not running continuously:
In front of the litter box sits a motion detector. When the detector "sees" the cat, it tells the computer to start a timer. After 5 minutes (hopefully enough time for the cat, unless he's reading), the fan kicks on and vents the box for 15 minutes. That's just about enough time to take care of any major business that occurred.
Out of respect for the neighbours, he added a dryer sheet on the vent to mitigate the outgoing fumes. How do you automate litter box stink management? Let us know in the comments.

Comments (AU Comments · US Comments)
There are currently no AU comments for this post.
equazcion
Posted 8:27 AM 28/9/08
I like it. Cat shit can really sometimes smell... like shit, yeah even if you clean it every day, depending on how air flows in your house and whatnot (I like saying whatnot). I mean I don't have cats myself, but if I did have an animal that I allowed to crap indoors, I'd probably be interested in making an exhaust system for that. It just makes logical sense.
equazcion
jupiterthunder
Posted 8:16 AM 28/9/08
This is one of those "just because I can" hacks isn't it.
jupiterthunder
infmom
Posted 8:09 AM 28/9/08
Just clean the box every day like you're supposed to, toss out the old litter and replace it with fresh once a week, and it won't smell. Unless you're trying to convince multiple cats to use one little litterbox like that, of course.
infmom
timefalls
Posted 8:09 AM 28/9/08
Finally, a decent use for a mac!
/flameon
timefalls
earlycj5
Posted 8:46 AM 28/9/08
Oh boy, even though we clean ours every day one of our cats is quite large, 20+ lbs. and can make a large mess quickly.
Even with daily cleaning there's still usually an unpleasant event sometime during the day.
earlycj5
MuglyTheWorm
Posted 8:43 AM 28/9/08
i had my litter box beside the furnace. everytime the a/c kicked on i got to smell what i had for dinner. the cat's litter box was on the other wall...
MuglyTheWorm
Fitwit
Posted 8:42 AM 28/9/08
Everyday? Thanks to our cat, Mr. Toxic Tail, I have to clean it immediately if I'm home ! We don't have a garage. This is a great idea. Now which wall to drill though...
Fitwit
equazcion
Posted 8:38 AM 28/9/08
@Hands: Like I said, it has something to do with the specific way air flows in a person's house. In one house I'm occasionally in, they sometimes need to scoop it up as soon as the cat drops one off, cause the smell wafts into the hallway right away.
And maybe some people are lazy about cleaning it out and tend to skip a day here and there; I'm sure many people are like that. I know I'd not be in such a big rush to clean out a bin that some animal uses as a toilet every day. Yeah I could see myself putting that off occasionally. I have a feeling this vent would make sense for lots of similar people.
equazcion
mdevens
Posted 8:35 AM 28/9/08
@mdevens: Oops, meant that as a reply to Hands but I wasn't logged in, and when it logged me back in it made my reply a new post.
mdevens
mdevens
Posted 8:34 AM 28/9/08
You ask first time visitors to your house if they can smell your litterbox? Do they come back a second time?
mdevens
Hands
Posted 8:31 AM 28/9/08
@equazcion: It only makes logical sense if you don't clean the box. As infmom says, clean it daily, replace the litter when necessary and no smell.
I have four cats, two litter boxes {I probably should have three or four but for six years it's never been a problem} and I ask every new person who comes into my house if they can smell it. No one has ever said yes.
A self venting litterbox is fun but it's a case of "just because you can doesn't mean you should."
Hands
Duane
Posted 9:09 AM 28/9/08
@Hands: I should do this. I clean the litter box every other day (two boxes for one cat), the smell is never a problem, except when my cat has just done his business, then half of the house stinks (he's healthy, eats good food, and not much people food) for about half an hour.
Duane
darkdantedevil
Posted 8:50 AM 28/9/08
if/
smell for catshite
Catshite=stink proceed to 1
Catshite=notstink proceed to 1
1 start fan
2. if/chatshite=no stink proceed to
darkdantedevil
oboreruhito
Posted 9:18 AM 28/9/08
If I did that to my cat's litter box, she would just start shitting in my bed.
oboreruhito
Marco
Posted 9:14 AM 28/9/08
Poor cat... after 5 minutes kitten looks like Elvis :-o
Marco
Duane
Posted 9:12 AM 28/9/08
Having a system like this would take care of that just after smell - which is what it seems like it was designed for, since it only runs for 15 mintues, just after the cat leaves. I honestly don't see any place that they say this is used in place of scooping regularly.
Duane
Ajh
Posted 9:11 AM 28/9/08
@infmom: It actually smells awful right after they go and for about 20 minutes afterwards.
Ajh
equazcion
Posted 9:11 AM 28/9/08
@MuglyTheWorm: I just wanted to acknowledge that a joke was said here, and that it was sort of funny, if you took the time to think about it.
equazcion
Eris
Posted 9:09 AM 28/9/08
@infmom: Believe me, my girlfriend's cat's litter box stinks like death and taxes as soon as the cat shits once. This would be a nice thing to have.
Eris
SnickerHaHa
Posted 10:06 AM 28/9/08
I don't have a cat, but to paraphrase Mark Twain, "Relatives are like fish; after three days they start to smell." This has stimulated some ideas. Thanks for the post.
SnickerHaHa
witeowl
Posted 9:52 AM 28/9/08
Now that... that... is smart. I mean, even with a brand-spanking fresh never-used litter box, there will be smell (and that dust) for a while after. (Anyone who claims that there isn't a smell for a while right after their cat goes is either in denial or has just become accustomed to it.) I don't have cats right now, but I'll be looking to figure out something like this if I ever do again!
witeowl
Stortebeker
Posted 10:30 AM 28/9/08
An old programmers rule says: garbage in, garbage out.
I discovered, that this rule also applies to cat food.
Just quit feeding canned food, but instead switch to high quality complete pallet food. It's better for the kittens kidneys, and believe me; the smell will be greatly reduced.
Stortebeker
aka_bigred
Posted 10:30 AM 28/9/08
This is a great idea, but who has their litter box in the garage?
aka_bigred
WoogleMuffin
Posted 11:08 AM 28/9/08
@timefalls:
That's right. You wouldn't want to trust litter duty to an unreliable Windows box - you might get BSOD'd ... (Blue Stench of Death)
WoogleMuffin
NilzXX
Posted 10:53 AM 28/9/08
@timefalls:
Totally Agreed.
NilzXX
zoomZAP
Posted 11:25 AM 28/9/08
My kitty's shit don't stink. I mean I wouldn't put her litter box under the dining room table or anything, but I don't feel the need to build a robot army to clean up after her either. Poor Wall-e.
zoomZAP
phrancis
Posted 12:19 PM 28/9/08
I built a similar thing for my cat box years ago when living in a dowtown apt. It used a tiny 12v graphics card fan, a junked plugin charger, and a smaller diameter vent hose. It wasn't automated and ran constantly, but was so low powered and quite that my cats didn't mind and it helped dry out the clumps too. Now I just scoop it out everyday and I don't need it anymore...
phrancis
aerialsoul
Posted 12:49 PM 28/9/08
Wow...that's a fair amount of work to just get rid of the initial aftersmell. I've had one of these litter boxes for about 5 years and it does an okay job:
[www.smarthome.com]
I've also been looking at this one:
[www.smarthome.com]
but it has to be connected to water and has to drain.
Yep, they are pricey, but i guess it depends on how much our time is worth for a weekend project (which I've spent my fair share of weekend hack projects, but I tend to not want to spend them on Cat litter projects).
:-)
aerialsoul
SamburgerHandwich
Posted 1:10 PM 28/9/08
A lot of new covered catboxes have charcoal filters that neutralize most of the smell.
SamburgerHandwich
yazan
Posted 1:47 PM 28/9/08
$20-30 buys you a litter box with a front lid and HEPA filter attached ...
yazan
Ortzinator
Posted 2:27 PM 28/9/08
From what I hear of corn cob litter, it's supposed to do wonder voodoo magic for controlling odors.
Ortzinator
infmom
Posted 2:18 PM 28/9/08
@earlycj5: We have a 24-pound monster kitty. As long as he manages to get his butt in the cat box, all is well. We must be feeding him right.
infmom
infmom
Posted 2:15 PM 28/9/08
@Eris: The cat must not cover after he uses the box. Not much can be done about that. Wafting the air around just spreads the smell.
The usual cat box problem is ammonia from a box that doesn't get cleaned often enough. We have friends whose house REEKS.
infmom
squishyalt
Posted 3:39 PM 28/9/08
Even better - with less maintenance.....
squishyalt
thisisasignin
Posted 5:02 PM 28/9/08
@equazcion:
I wish my "kitty mess" smelled like Pizza and McDonalds :(
thisisasignin
thisisasignin
Posted 5:16 PM 28/9/08
@squishyalt:
iz on ur islandz, burin mai pewp.
thisisasignin
lifeh4xor
Posted 9:12 PM 28/9/08
I fixed my cat odor problems with an ax at the end of the field...
yeee-aaah.
lifeh4xor
muddypaws
Posted 11:23 PM 28/9/08
You don't have a cat litter tray in the house, right?
You have a cat litter tray in the garage, right?
Why have a litter tray at all?
here's a hack:
Buy a cat flap. Let it shit outdoors.
muddypaws
rtipping
Posted 11:44 PM 28/9/08
Finally an article with substance I hate cats but if I had one give me........ .say for Christmas or because I did something wrong I would defiantly build one of these it is much more humane than garage enema's or pre-deodorized cat food..
rtipping
JayDeEm
Posted 1:10 AM 29/9/08
We have a Littermaid for 2 cats right now and it works out fine as long as the collection tray is changed regularly. The only time we really have an odor problem is right after they use it. Unfortunately for us, the only good place for the box is in the vicinity of our A/C intake vent. Once in a while the cats will time it just right...
JayDeEm
homerjay
Posted 1:04 AM 29/9/08
@timefalls: Finally another reason not to have a cat.
homerjay
speed1961
Posted 1:30 AM 29/9/08
@homerjay: There are no reasons not to have cats; only reasons not to have children.
speed1961
speed1961
Posted 1:36 AM 29/9/08
Perhaps in a few thousand years--when dogs evolve in their intelligence to equal that of today's cats--they too will be able to poop in a litter box and this project will become even more relevant ;-)
speed1961
nobodyzhome
Posted 3:26 AM 29/9/08
I simply stopped feeding my cat. Problem solved. Much cheaper, too.
(Note to PETA: The above statement was a joke. I don't really have a cat.)
nobodyzhome
SirSmiley
Posted 3:22 AM 29/9/08
Let's see I've a large covered box with lid that includes two HEPA filters that I bought for $23.
How is something a hack when it turns a $15 litter box into a $40 piece of technological wonder just because someone is too lazy to actually scoop the box out on regular basis?
SirSmiley
Duane
Posted 3:40 AM 29/9/08
@nobodyzhome: Of course you don't have a cat, you didn't feed it. ;)
Duane
parabola101
Posted 5:19 AM 29/9/08
I really hate the smell of litter boxes. I know this is a pricey solution, but it really works [www.catgenie.com]
parabola101
SamidhaTaygete
Posted 1:56 PM 28/9/08
KISS--- Just use an old PC fan powered by one of those leftover AC adapters you have in the closet.
SamidhaTaygete
AnnLabeo
Posted 8:54 AM 28/9/08
Fancy, but not required. A container of baking soda will do amazing, miraculous things, simple as it may be. We've had astounding success with it, and there's nearly zero maintenance to boot!
AnnLabeo
karindalziel
Posted 8:00 AM 29/9/08
I would love to hear other cat smell negating hacks. My cats refuse to use covered litterboxes, so this wouldn't work. My husband's love of cats and my love of a stink free home is one of the ONLY arguments we have. :(
karindalziel
iNomad
Posted 8:27 AM 29/9/08
How many times has the cat gotten sucked up in it? lol. MEEEOW!
iNomad
SirSmiley
Posted 8:52 AM 29/9/08
You could try toilet training your cat's. It's supposedly easy and you can even go a step further and teach them how to flush.
My aversion to toilet training w/flushing is that my cat's would be flushing the toilet constantly just to watch the water go down the drain.
SirSmiley
DoctorNine
Posted 9:16 AM 29/9/08
I prefer the 19th century solution: Taxidermy:
No muss, no fuss, and you save on cat food.
DoctorNine
Hands
Posted 9:45 AM 29/9/08
@Duane: I can be standing in the litter box room when one of mine does his business and not smell it because they're all good about covering up.
I didn't find that true with my first batch of cats {25 years ago - the current batch is my second} and the big difference is their diet. Then it was Friskies, now it's premium food - Iams, Science Diet, et al. Altho they can eat as much as they like, they don't and none of them are fat; all of them are muscular. I've always felt the type of food they eat determines how smelly their boxes are.
Hands
homerjay
Posted 10:16 AM 29/9/08
@speed1961: Oh I disagree. There are just as many reasons not to have cats as there are not to have children. Funny thing is that most of those reasons are the same.
homerjay
dialmelo
Posted 11:45 AM 29/9/08
@AnnLabeo:
Agreed. As the owner of two large felines, Mr. Guiness (18 lbs.) and Mr. Jameson (16 lbs.), baking soda has been a blessing.
dialmelo
DangerousLiberal
Posted 12:20 PM 29/9/08
@jupiterthunder: Yeah--it's like the better mousetrap, except that the better mousetrap has its own computer. The technical term is kludge. This site is full of them. But at least it's not linked to a Popular Mechnics article telling you that anti-gravity boots or flying cars are just around the corner, any day now....
DangerousLiberal
Prest0
Posted 12:52 PM 29/9/08
Littermaid is totally the way to go. Bought a refurbished one on Ebay five years ago and never looked back. If it died today, I'd be at the pet store tonight buying a new one. I use a plastic grocery sack as a liner for the littermaid liners, which means I'm not even spending much money on consumables (other than fresh litter and cat food, naturally.)
Prest0
memoryinmotion
Posted 12:50 PM 29/9/08
I'm surprised no one has brought up "Crystals" litter yet. Not the blend, the pure stuff. I have used it for seven years now, and unless you're right next to the box when kitty does his/her business - there is zero odor.
And no, I'm not in denial - many people (including a realtor) have told me they don't "smell cat".
memoryinmotion
virgilstar
Posted 12:44 AM 30/9/08
Is it any wonder that the poor buggers in the middle east can't wait to blow our frickin' buildings up, when Americans devote so much time, energy, money and effort, to cleaning up catsh!t? If we even spent 10% of this on solving some of the world's problems (global warming, aids in africa, darfur, civil rights in china and its annexes), we could go a long way to avoiding the frickin' Jihad we have invoked.
Seriously, if anyone has enough time to robot-mod their kitty box, they're spending too much time indoors and really need to get out more.
virgilstar
abhowell
Posted 4:15 AM 30/9/08
@infmom: Who wrote those rules? If you get a big box put enough litter in there you don't have to clean it out more than once or twice a week. A box of matches next to it is also considerate...
abhowell
MosesBabawaba
Posted 12:18 PM 28/9/08
Easier solution - gid rid of the damn cat!
MosesBabawaba
AimeeGee
Posted 6:41 AM 30/9/08
@karindalziel:
I have one of those self-cleaning litter boxes.... Gotta say... It may be expensive, but I swear by it. It scoops every time my cat goes in the box, and it scoops right into a covered container. The only time there's a smell is if the dirty litter receptacle is over-full. Clear out the little bin every 5 days or so and there's never a smell! Not bad, eh?
AimeeGee
cincyunixguy
Posted 9:12 PM 28/9/08
Daily litter box changes, and Glade air freshers are all you need for smell.
cincyunixguy
mwb1100
Posted 8:08 AM 30/9/08
@virgilstar: While there may be some priority problems in the US, I don't really think that people putting fans on cat litter boxes is part of the problem.
mwb1100
HeffeD
Posted 4:07 AM 1/10/08
@Hands: Yikes! Iams and Science Diet are definitely not 'premium' food... If you want premium, try something like Natural Balance. It's all digestible food in there. No fillers. The plus to feeding your pet premium food is that a higher percentage of the waste is digested. Meaning, less and smaller poops. Innova and Felidae are also high quality foods, but you can only find them at boutique pet stores, while Petco carries Natural Balance.
HeffeD
wyrless2002
Posted 12:10 AM 29/9/08
Has anyone forwarded this to Sigfried and Roy yet?
wyrless2002
Hands
Posted 12:13 PM 1/10/08
@HeffeD: I'm familiar with it but my cats won't eat it. If their poops are any indication, my guys are pretty healthy.
Hands
EstaAntheia
Posted 10:07 AM 28/9/08
it's past time for house designers to start including infrastructure to accommodate pets
EstaAntheia
SanchaliJagabat
Posted 9:59 AM 28/9/08
Why not go to the source and just get rid of the cat. I'm sure you would be doing your neighbors next to the "vent" a favor.
SanchaliJagabat
CollierXuthus
Posted 9:59 AM 28/9/08
damn a mac mini is super over kill if this is all its doing! you could do the same thing with $40 woth of components using the arduino (www.arduino.cc) as a brain. much less power
CollierXuthus
SatyaLabadoozie
Posted 9:40 AM 28/9/08
This is very fun. I would really like to do something like that this. Our cat takes some nasty ones when he's home alone all day and it stinks the basement up, this would be a cool way to get rid of that smell. Now only if there was a way to add a RJ-45 Jack so you can make this a network device and it can update on it status. haha. Just a thought?
SatyaLabadoozie