If blinds, screens, curtains or other window coverings we provide need repair/replacement, and we determine that the cause was not due to a defective product or installation, we will charge you a PRORATE using the expected life (# of years) of as below

Blinds: 7
Curtains: 7 

Screens: 7. (Exclude any damage caused by the sun) SOURCE: LINK

Screen doors: 30 
Window Glass: 7 (Broken from outside for multi unit properties,tenant not responsible)
Windows: Aluminum 15 
Windows: Wooden 25
Windows: Double Pane 15 
Windows: Skylights 10 
Windows: Louvre 10
Windows: Vinyl/Fiberglass 20