In compliance with the UL1777 standard for masonry chimneys and fireplaces, the DuraFlex SS 6-ft. Mortar Sleeve for 5.5 inch Chimney Liner is designed to effectively provide the needed ventilation while avoiding the damage often caused by flue condensation. Although its diameter is actually an inch larger than its nominal diameter, the product is manufactured to perfectly fit into the DuraFlex UltraPro 5.5-in. chimney liner pipe. This stainless steel mortar sleeve is also available in 4", 5", 6", and 8", and each is made to stand the test of time.
- UltraPro 6-in. Mortar Sleeve
- Designed for Dura flex UltraPro 5.5-in. chimney liner pipe
- Actual diameter is 1" larger than nominal diameter
- Available in 4", 5", 5.5", 6", and 8"