Single piece of chimney. It can be used as 2nd chimney instead of your 1 of 2 existing chimneys.
Height is 27.5" height.
If you order 2 qty, we will send you both top and bottom chimneys. For both, maximum height is 27.5+27.5 (=55 inches)
Longer Chimney for RXN-WSeries
Accessories has no return/exchange/refund