Wouldn't a tenant notice weird sounds from the exhaust fan and notified the landlord, and also one can't sue animals.
I’m betting either birds, or tree rats.
Idiot renters should be inspecting their kitchen fan ducting on a regular basis.
What has happened to practical education in this country?
From the article:
“...Over time, the nesting material and accumulated grease
heated up enough to ignite...”
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It would still need a spark to cause it to ignite.
My outdoor air conditioner stopped working, and the technician found that mice had gotten inside and chewed the wires. Some wire insulation is made with soy oil; maybe that was the attraction.
I’ve heard that mice can get in your house and chew the wires on appliances like your stove, which can cause a house fire.
Cats are essential companions when you live near a wooded area.