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Pipe Inside Diameter
This can be measured from interior wall to interior wall of the innermost walls in a venting component. Typically, this measurement will coincide with the flue size, in systems where no increasers, or decreasers are used.\r\n
Pipe Inside Diameter

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  • DuraVent 6DFS-FC
  • DuraVent 6DFS-FC
  • 6" Inner Diameter - DuraFlex SS Flexible Liner Chimney Pipe - Single Wall - Connector
  • Our Price: $17.96
  • 6" DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 5DFA-FC
  • DuraVent 5DFA-FC
  • 5" Inner Diameter - DuraFlex AL Flexible Liner Type B Gas Vent Pipe - Double Wall - 3" Coupling
  • Our Price: $4.56
  • You Save: 20%
  • 5" DuraFlex AL Collection
  • Available in 1 Finish
  • DuraVent 6DF304-15
  • DuraVent 6DF304-15
  • 6" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 15' Flex Pipe Length
  • Our Price: $247.40
  • You Save: 10%
  • 6" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent DFS-SA
  • DuraVent DFS-SA
  • 3 Inch to 8 Inch DuraFlex Spark Arrestor From the DuraFlex SS Series
  • Our Price: $12.78
  • You Save: 10%
  • DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 3DFA-25
  • DuraVent 3DFA-25
  • 3" Inner Diameter - DuraFlex AL Flexible Liner Chimney Pipe - Double Wall - 25' Flex Pipe Length
  • Our Price: $88.84
  • You Save: 19%
  • 3" DuraFlex AL Collection
  • Available in 1 Finish
  • DuraVent 6DLR-MTSC
  • DuraVent 6DLR-MTSC
  • 6" Inner Diameter - DuraLiner Rigid Liner Chimney Pipe - Double Wall - 7.24" to 10" Masonry Wall Thimble with Slip Connector
  • Our Price: $90.89
  • You Save: 10%
  • 6" DuraLiner Collection
  • Available in 1 Finish
  • DuraVent 3DFA-FC
  • DuraVent 3DFA-FC
  • 3" Inner Diameter - DuraFlex AL Flexible Liner Type B Gas Vent Pipe - Double Wall - 3" Coupling
  • Our Price: $3.33
  • You Save: 19%
  • 3" DuraFlex AL Collection
  • Available in 1 Finish
  • DuraVent 6DLR-48
  • DuraVent 6DLR-48
  • 6" Inner Diameter - DuraLiner Rigid Liner Chimney Pipe - Double Wall - 48" Pipe Length
  • Our Price: $167.73
  • You Save: 9%
  • 6" DuraLiner Collection
  • Available in 1 Finish
  • DuraVent 3DFA-MS
  • DuraVent 3DFA-MS
  • 3 Inch x 4 Inch Diameter DuraFlex Mortar Sleeve From the DuraFlex AL Series
  • Our Price: $13.09
  • You Save: 25%
  • 3" DuraFlex AL Collection
  • Available in 1 Finish
  • DuraVent 6DF304-15K
  • DuraVent 6DF304-15K
  • 6" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 15' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $352.68
  • You Save: 10%
  • 6" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 4DFS-FC
  • DuraVent 4DFS-FC
  • 4" Inner Diameter - DuraFlex SS Flexible Liner Chimney Pipe - Single Wall - Connector
  • Our Price: $12.63
  • You Save: 10%
  • 4" DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 4DFA-25K
  • DuraVent 4DFA-25K
  • 4" Inner Diameter - DuraFlex AL Flexible Liner Type B Gas Vent Pipe - Double Wall - 25' Chimney Liner Kit
  • Our Price: $153.13
  • You Save: 19%
  • 4" DuraFlex AL Collection
  • Available in 1 Finish
  • DuraVent 6DLR-14ROF
  • DuraVent 6DLR-14ROF
  • 6" Inner Diameter - DuraLiner Flex Pipe Chimney Pipe - Double Wall - 14" Round-To-Oval Flex Pipe
  • Our Price: $124.93
  • You Save: 9%
  • 6" DuraLiner Collection
  • Available in 1 Finish
  • Metalbest AF35-04
  • Metalbest AF35-04
  • 4" x 35-Foot Flexible Liner Aluminum Flex Liner Termination Kit
  • Our Price: $143.14
  • AFCL Collection
  • Available in 1 Finish
  • Metalbest AF35-03
  • Metalbest AF35-03
  • 3" x 35-Foot Flexible Liner Aluminum Flex Liner Termination Kit
  • Our Price: $129.38
  • You Save: 4%
  • AFCL Collection
  • Available in 1 Finish
  • HomeSaver 17022
  • HomeSaver 17022
  • 25ft. FlexWrap Liner Insulation Kit for 6" Pipe
  • Our Price: $307.10
  • You Save: 6%
  • FlexWrap Collection
  • Available in 1 Finish
  • DuraVent 6DFS-TP
  • DuraVent 6DFS-TP
  • 6 InchDuraflex Top Plate From the DuraFlex SS Series
  • Our Price: $22.90
  • You Save: 9%
  • 6" DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 4DF304-25K
  • DuraVent 4DF304-25K
  • 4" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 25' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $366.37
  • You Save: 9%
  • 4" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 4DF304-15K
  • DuraVent 4DF304-15K
  • 4" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 15' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $262.14
  • You Save: 10%
  • 4" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 4DF304-20K
  • DuraVent 4DF304-20K
  • 4" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 20' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $314.78
  • You Save: 10%
  • 4" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 3DF304-20K
  • DuraVent 3DF304-20K
  • 3" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 20' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $268.46
  • You Save: 10%
  • 3" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 3DF316-20KT
  • DuraVent 3DF316-20KT
  • 3" Inner Diameter - DuraFlexSS 316 Flexible Liner Chimney Pipe - Single Wall - 20' Tee Kit Includes Top Plate, Cap, Tee with Clean Out Cap and Flex Length
  • Our Price: $338.99
  • You Save: 10%
  • 3" DuraFlexSS 316 Collection
  • Available in 1 Finish
  • DuraVent 6DFA-25K
  • DuraVent 6DFA-25K
  • 6" Inner Diameter - DuraFlex AL Flexible Liner Type B Gas Vent Pipe - Double Wall - 25' Chimney Liner Kit
  • Our Price: $192.93
  • You Save: 20%
  • 6" DuraFlex AL Collection
  • Available in 1 Finish
  • Metalbest AF4-35L
  • Metalbest AF4-35L
  • 4" x 35-Foot 2-Ply Aluminum Flex Chimney Liner
  • Our Price: $74.73
  • You Save: 36%
  • AFCL Collection
  • Available in 1 Finish
  • DuraVent 3DF304-25KT
  • DuraVent 3DF304-25KT
  • 3" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 25' Tee Kit Includes Top Plate, Cap, Tee with Clean Out Cap and Flex Length
  • Our Price: $341.39
  • You Save: 9%
  • 3" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 3DF304-15KT
  • DuraVent 3DF304-15KT
  • 3" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 15' Tee Kit Includes Top Plate, Cap, Tee with Clean Out Cap and Flex Length
  • Our Price: $275.83
  • You Save: 9%
  • 3" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 8DFS-FC
  • DuraVent 8DFS-FC
  • 8" Inner Diameter - DuraFlex SS Flexible Liner Chimney Pipe - Single Wall - Connector
  • Our Price: $17.16
  • You Save: 10%
  • 8" DuraFlex SS Collection
  • Available in 1 Finish
  • Metalbest AF25-04
  • Metalbest AF25-04
  • 4" x 25-Foot Flexible Liner Aluminum Flex Liner Termination Kit
  • Our Price: $119.83
  • You Save: 25%
  • AFCL Collection
  • Available in 1 Finish
  • DuraVent 3DF304-25
  • DuraVent 3DF304-25
  • 3" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 25' Flex Pipe Length
  • Our Price: $245.31
  • You Save: 9%
  • 3" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 4DFA-25
  • DuraVent 4DFA-25
  • 4" Inner Diameter - DuraFlex AL Flexible Liner Chimney Pipe - Double Wall - 25' Flex Pipe Length
  • Our Price: $108.94
  • You Save: 20%
  • 4" DuraFlex AL Collection
  • Available in 1 Finish
  • DuraVent 4DF316-25K
  • DuraVent 4DF316-25K
  • 4" Inner Diameter - DuraFlexSS 316 Flexible Liner Chimney Pipe - Single Wall - 25' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $392.69
  • You Save: 9%
  • 4" DuraFlexSS 316 Collection
  • Available in 1 Finish
  • DuraVent 4DFA-FC
  • DuraVent 4DFA-FC
  • 4" Inner Diameter - DuraFlex AL Flexible Liner Type B Gas Vent Pipe - Double Wall - 3" Coupling
  • Our Price: $3.96
  • You Save: 20%
  • 4" DuraFlex AL Collection
  • Available in 1 Finish
  • DuraVent 6DFS-FP
  • DuraVent 6DFS-FP
  • 6" Inner Diameter - DuraFlex SS Flexible Liner Chimney Pipe - Single Wall - Puller
  • Our Price: $23.69
  • You Save: 9%
  • 6" DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 6DF316-20K
  • DuraVent 6DF316-20K
  • 6" Inner Diameter - DuraFlexSS 316 Flexible Liner Chimney Pipe - Single Wall - 20' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $461.99
  • You Save: 10%
  • 6" DuraFlexSS 316 Collection
  • Available in 1 Finish
  • Metalbest 6RF25IK
  • Metalbest 6RF25IK
  • 6" x 25-Foot Flexible Liner Stainless Steel Flex Insert Kit
  • Our Price: $647.90
  • You Save: 25%
  • SFCL Collection
  • Available in 1 Finish
  • Metalbest AF25-03
  • Metalbest AF25-03
  • 3" x 25-Foot Flexible Liner Aluminum Flex Liner Termination Kit
  • Our Price: $113.56
  • You Save: 25%
  • AFCL Collection
  • Available in 1 Finish
  • DuraVent 3DF304-30KT
  • DuraVent 3DF304-30KT
  • 3" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 30' Tee Kit Includes Top Plate, Cap, Tee with Clean Out Cap and Flex Length
  • Our Price: $407.42
  • You Save: 10%
  • 3" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • Metalbest AFE10-03
  • Metalbest AFE10-03
  • 3" x 10-Foot Aluminum Flex Length Extension Kit
  • Our Price: $39.99
  • You Save: 25%
  • AFCL Collection
  • Available in 1 Finish
  • DuraVent 3DF304-20
  • DuraVent 3DF304-20
  • 3" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 20' Flex Pipe Length
  • Our Price: $205.29
  • You Save: 10%
  • 3" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 3DF304-15
  • DuraVent 3DF304-15
  • 3" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 15' Flex Pipe Length
  • Our Price: $179.60
  • You Save: 25%
  • 3" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 3DF316-25K
  • DuraVent 3DF316-25K
  • 3" Inner Diameter - DuraFlexSS 316 Flexible Liner Chimney Pipe - Single Wall - 25' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $343.20
  • You Save: 10%
  • 3" DuraFlexSS 316 Collection
  • Available in 1 Finish
  • DuraVent 3DF316-20K
  • DuraVent 3DF316-20K
  • 3" Inner Diameter - DuraFlexSS 316 Flexible Liner Chimney Pipe - Single Wall - 20' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $295.83
  • You Save: 10%
  • 3" DuraFlexSS 316 Collection
  • Available in 1 Finish
  • DuraVent 6DFS-T
  • DuraVent 6DFS-T
  • 6" Inner Diameter - DuraFlex SS Flexible Liner Chimney Pipe - Single Wall - Tee with Cap
  • Our Price: $88.43
  • You Save: 10%
  • 6" DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 6DFS-X55
  • DuraVent 6DFS-X55
  • 5-1/2" to 6"" Inner Diameter - DuraFlex SS Flexible Liner Chimney Pipe - Single Wall - Increaser/Reducer
  • Our Price: $14.57
  • You Save: 9%
  • 6" DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 6DF304-20K
  • DuraVent 6DF304-20K
  • 6" Inner Diameter - DuraFlexSS 304 Flexible Liner Chimney Pipe - Single Wall - 20' Basic Kit Includes Top Plate, Cap, Connector and Flex Length
  • Our Price: $410.58
  • You Save: 10%
  • 6" DuraFlexSS 304 Collection
  • Available in 1 Finish
  • DuraVent 7DFS-FP
  • DuraVent 7DFS-FP
  • 7" Inner Diameter - DuraFlex SS Flexible Liner Chimney Pipe - Single Wall - Puller
  • Our Price: $26.22
  • You Save: 0%
  • 7" DuraFlex SS Collection
  • Available in 1 Finish
  • DuraVent 6DFSW-20KT
  • DuraVent 6DFSW-20KT
  • 6" Inner Diameter - DuraFlex SW Flexible Liner Chimney Pipe - Single Wall - 20' Tee Kit Includes Top Plate, Cap, Tee with Clean Out Cap and Flex Length
  • Our Price: $684.30
  • You Save: 10%
  • 6" DuraFlex SW Collection
  • Available in 1 Finish
  • DuraVent 8DFS-TP
  • DuraVent 8DFS-TP
  • 8 InchDuraflex Top Plate From the DuraFlex SS Series
  • Our Price: $22.90
  • You Save: 9%
  • 8" DuraFlex SS Collection
  • Available in 1 Finish
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