Sliding doors and windows help create space and can easily be opened or shut. However, some don’t come with screens. Vent Well allows owners of sliding doors or windows to get the fresh air they want without letting in bugs or rain. This Aussie ventilation system is made out of plastic and has a completely adjustable height for any opening. It is easy to install and makes a great guard for pets or children’s toys. One Vent Well with one extender goes for $36 on Indiegogo with an estimated delivery date of July 2014. Vent Well hopes to raise an ambitious $150,000 AUD in its 50-day campaign run.