When we lived in a patio villa we had a garage screen for three reasons:
1. Our cats! I didn't want the litter inside the house so the garage was the choice. However, we could never leave our garage door open for fear the cats would run outside the garage before or after using their litter boxes We had a cat door installed so the cats could go from the house into the garage at will. So having a screen provided the security of keeping the cats contained yet having the garage door open to air the area and keep litter smell at a minimum.
2. I smoke and used the garage as my computer room. Having a garage door screen helped keep the cigarette stench at a minimum by providing air flow.
3. Our washer and dryer were in the garage. During the summer it was unbearably hot so having a screen let us keep the garage door open to help cool down the garage to make it more bearable to be out there while doing laundry.
We no longer need a screen. We moved to another home, our cats died, our laundry room is located inside the house, and I use the lanai for my computer work.
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