How do I hide furnace exhaust pipes outside?

You can frame it in and put siding on it like a chimney. make sure the vent opening is clear.

You shouldn't do anything that will block it as the fumes can back up.

It won't matter if you see it or not if you try to hide it, because you won't be around to not see it. The fumes will get you. Don't ever try to hide anything EXHAUST.

Add a trellis that opens or comes off to allow access when reuired.

I used an extra piece of privacy fence panel that I cut into 3rds and used hinges to create an outdoor privacy screen that was easy to move.

You can build a "chimney" structure around it. If you don't use material that is heat/high temp like brick, make sure you don't enclose and leave room for air to circulate.

Hi Robert, you can build a little 3 sided box that goes around it, easily moveable for any work you ma have to do on the exhaust.

A larger planting bed with small shrubs will hide the vents and meter from the Curb Appeal view. If you are wanting to hide them even more for your own serenity, consider installing a short solid wood screen much closer to the vent, meter and white PVC pipe. Build it and paint it to match the house.