In addition, the when the fans are run continuously and never cleaned, they wear out relatively fast.2) The most important reason not to include fans is that they're a safety (and therefore a liability) hazard.

Sure is a liability, but life is full of liabilities. 

If it makes her feel better, it's worth it. 2) If for instance you get into a car accident and several people are killed, your liability may be greater than your coverage.

But one thing is for certain, renting is an economic liability. 

Let's say it includes up to $500K in liability. 

Refusing to allow such a device after a tenant's request for same could open the landlord to potential liability (should something a break-in, assault, etc. occur) because you're preventing the tenant from adding a level of protection that is allowed by law and cannot reasonably be considered an invasion of anyone's privacy since that expectation has already been addressed by the highest court in the land.  

Lots of people don't know what they don't know & that's a liability bus I am not planning on being ran over by.That said those above reasonable contract contingencies are very different than dealing with a potential buyer who is going into a contract with the thought process of utilizing an escape clause.

I do think they do good work, but you do need to be on top of your asset and make sure they are managing your property well.......it's the difference of having an asset or it being a liability.

My main concern is liability/being sued, i've been lead to believe incorporating will reduce my personal liability. 

Especially the last sentence (in bold below) landlords must examine closely their neutral policies and practices, which may have an unintended discriminatory effect thus exposing the landlords to liability.