An invisible or floating shelf is most often used when trying to produce a more modern look. They can be very appealing for small spaces as well, when a bookcase just wont fit. The shelves can be placed at any desired height, perfect for an office or a childs room.
Gondola Shelving is Commonly used is retail stores such as pharmacies, supermarkets and convenience stores. They are constructed of metal components and metal shelving, they most commonly used a peg board backing. More info can be found at http://www.mfried.com/gondola-shelving
This depends on how your greenhouse is built. If it used tables you can install tables based shelving units. If you are made of glass you can used adhesive based shelving units on the glass windows.
Gondola shelving is often used in retail stores. One can purchase Gondola shelving from many shelving suppliers such as Fixture Finders and Smart Fixtures. There are many styles one can choose from.
The gorilla shelving units are great ways to store heavy objects. These units are used to store things that the average shelving unit cannot.
It's shelving like this -http://www.action-storage.co.uk/Shelving-and-Racking/Freezer-and-Cold-Store-Shelving/c-1-106-325/Its shelving designed to be stored in fridges and freezers, that won't rust or corride in the damp and cold environment. Normal steel and wooden shelving can't be used in fridges and freezers.
The main benefits of office shelving, or just shelving in general, would be to organize various items and keep a room tidy and uncluttered. In an office situation, shelving would most normally be used for the storage of files, folders and stationery.
Gondola Shelving is Commonly used is retail stores such as pharmacies, supermarkets and convenience stores. They are constructed of metal components and metal shelving, they most commonly used a peg board backing. More info can be found at http://www.mfried.com/gondola-shelving
Racking and shelving are storage solutions used in warehouses and retail spaces to organize and store items in an orderly manner. Racking typically refers to heavy-duty metal structures used to store palletized goods, while shelving refers to smaller, more versatile units used for displaying and storing smaller items
I don't believe that a company can sell used shelving. However there are many second hand stores that could sell used shelving. some hardware stores have bulk sales or after a while the price will drop dramatically, I would contact you local store and ask.
The standard wall shelf depth typically used for most shelving units is around 12 inches.
You could try looking on craigslist/classifieds for local people who are trying to sell or give away their wire shelving. If you end up needing to buy new shelving, try Walmart or Target.
In storage shelving, materials like woods and plastics. They can perform very good for household devices. They can be used in kitchen and for storing books also.