Our installer quoted us for DuraVent, however Olympia's Ventis has our interest for a few reasons, but it seems it isn't used nearly as often so I just want to make sure we're not missing something! It appears we may have quite a bit of pipe above our roof, since this spot wouldn't have a chase but will be highly visible to us it would be a real boon for it to be powder coated to blend in to the house a bit as opposed to stainless steel. I'm also intrigued by their insulation "healthier" claim, "fume-free" etc. ETA also "forever warranty". Is there any functional difference? Are they both equally insulated? Draw is a big concern for us so if one has a leg-up that would be good to know. I'm hoping they would both be very tightly sealed at joints to help with that. We want to go Stainless steel for either (just powder coated with the Ventis). Also, the Ventis offers options of 304L or 316L inner wall pipe, I have no idea which would be preferable here, thoughts? Thank you!