DuraVent FasNSeal Flex 3" x 45' Stainless Steel Custom Flex Length sqft1413 Of the two control access

Of the two control access options to choose from

4DTM-UK 4-Inch

Outside dimensions: 4¾" x 4¾" x 1¾"

Accent lights (30" and 35" sizes)

DuraVent FasNSeal Flex 3" x 45' Stainless Steel Custom Flex Length sqft1413 Of the two control accessMade from super ferritic stainless steel. Corrosion resistant. Manufactured with a sure seal locking seam for superior strength and flexibility. The smooth inner wall provides for no output reduction, allowing for full appliance efficiency, ease of cleaning and regular maintenance. The smooth inner wall optimizes gas flow, minimizes back pressure, and facilitates condensate management. Only flexible chimney liner listed to UL 1738 standard. What's