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The life of a pair of orthotics will vary between patients. If the orthotics are for every day use you may expect them to last for a couple of years. However if you are a long distance runner / walker you may find that they wear out more more quickly. Basically, it will depend on the amount of use of a pair of orthotics.
I don't know I'm asking you
Yes, the best foot drop orthodic to use 24hrs is the Soft Foot Drop Brace at http://store.grandviewmedical.com/foleknsu.html There are also other solutions but if you have a foot drop problem you need some type of orthodic to help you walk.
The filters are what needs to be replaced most often on the air conditioning units.
It depends on the use, but yes, they have to be replaced periodically.
3 months i think
it depends on the abuse they take
The Honeywell filter should be replaced every 8- 12 months or as needed.
They need replaced when they wear out.
This depends on how much your car is exposed to the elements. In areas with poor weather, it will need to be replaced often.
they never need to be relubricated just replaced
When they are warped or worn beyond legal limits.