[Pursya]

Not a solution, sorry.
But i just had to write about how much of an American thing having a "Critter Screen" is.
I almost fell off my chair laughing. Never heard of such a thing!

Sorry to be off topic...

 

[Pursya]

Without it, the birds make nests in the vent. The flaps are no impediment, I've watched them open one and go in to build their nests. Not sure why it would be just an "American Thing", don't you have birds where you live?

I'm not sure that "dryer vents" are a big thing over here. Remember we have very few places that are consistently at or below zero degrees Celsius.
My dryer is barely used and vents directly into the laundry.
Mind you, I do live on an acre in a rural area and these two "critters" are more our issue;

Eastern Brown Snake

Eastern Brown Snake

australian.museum

Tiger Snake

Tiger Snake

australian.museum

And the ever present danger.....

Drop Bear

This urban legend focuses on bush walkers having been known to be 'dropped on' by drop bears, resulting in injury including mainly lacerations and occasionally bites.

australian.museum

 

[Pursya]

australia "dryer vent" - Google Search

"If you are venting your dryer into your home, you need to stop doing so. Indoor dryer vents are not safe. They can cause health problems due to a build-up of mold and structural damage due to the increased humidity. They can also be a fire hazard as the lint they spew into the air is highly flammable."​

https://en.wikipedia.org/wiki/Drop_bear

Well there is an exhaust fan in the ceiling that is also active when drying.
After 18 years, no mould. I've yet to see lint "spewed into the air". The only fire hazard is the one you also suffer from and that is lint build up in the filter. The filter in my case is in the front centre of the dryer and is easily pulled off and cleaned after/before any cycle. It's a 30 year old machine and, due to not much use, still almost pristine. It is being replaced by an integrated washer/dryer which, from research, is more likely to catch fire than the stand alone unit.
I'll leave that here now as I have taken this thread way off topic and been absolutely no help to the opening poster.

 

[Pursya]

Even in our permission to do almost anything County, it's against code to vent into house. Frankly, I never heard of anyone ever doing this.

I work in the building supply industry and have never heard of such a code in Australia.
Unless of course you are using a gas fired dryer, a very rare thing here. I've never seen a domestic gas fired dryer though they do exist in industrial situations.

 

[Pursya]

OP's dryer is propane.

Well there you go.
As I say, I'm very unfamiliar with that type of dryer. Just no need for them here.
I hope anyone operating one of these in a domestic situation also has a carbon monoxide alarm nearby. I just installed a coupe of Google Nest smoke alarms that also do monoxide.
Highly recommended.

This happened a decade ago near a place we used to live.

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www.heraldsun.com.au

 

[Pursya]

Really bad idea!

Not at all. I would estimate 99% of Australian dryers do the same thing. I've been doing it for near on 40 years. Never had mould, never had a fire, never had an issue.
These are electric dryers of course.

 

[Pursya]

is breathing in lint harmful - Google Search

www.google.com

I don't understand how you guys don't get that these dryers are electric, have lint filters, are located in a separate room that can be closed off.
I think walking down the street in any large American city would be more harmful to your lungs than the dryers we use.
And, as I've stated, our weather means we are unlucky to use a dryer maybe 10 times a year.
As far as building codes go, we are very regulated here. But there are no regulations for venting of electric clothes dryers. For good reason.

Appliances Online

www.appliancesonline.com.au

Basic dryer models will only give you one venting option - through the front of the machine. This option is fine if your laundry has an inbuilt exhaust fan or a window - otherwise you will find that the room becomes hot and damp whenever the dryer is in use.