It must not be a condensing unit as it is SS metal duct. All of my appliances in my house are condensing (2 on-demand water heaters and a forced air furnace) so all exhausts and intakes are Sch40 PVC pipe. When I put them in, the intakes are high up on one wall, but the exhausts are like yours near ground level around the corner (limited spaces that met code for these on the house). I made a snorkel for them with a 90 sweep up, a couple feet of pipe, then a pair of 45's with a stub in between them to point it back towards the ground. Then I later wrapped hardware cloth around them to keep critters out, but didn't do it fast enough and a couple birds got into my furnace and died. You can get SS hardware cloth/mesh too, so it won't react and corrode with your SS pipe. Even cutting a disc of it that is snug inside the pipe is a good measure.