Kind of ugly looking... And that paint is probably coming off when the tape comes down I had a new furnace/AC installed last year with a 4" filter. $50 CAD for

Kind of ugly looking... And that paint is probably coming off when the tape comes down I had a new furnace/AC installed last year with a 4" filter. $50 CAD for a carbon filter and leaving just the fan on made a vast reduction in smoke smell during a wildfire or two from BC.