Aluminum Liner Kits

Our 2-ply 3003 aluminum liner can be used to vent Category 1 gas appliances with A.F.U.E. of 83% or lower. In many cases, especially when only water heaters are vented into masonry flues, the gas appliances are vented into oversized flues. This practice may cause serious condensation and performance problems. When relining the chimeny with our aluminum liner, one of the industrys thickest aluminum liners, you can reduce the condensation problems and improve the perfomance of the appliances. M-FLEX Aluminum Liner Kit

Available in:


  • 3" - 8" diameter
  • 10 foot extensions
  • 25', 30', 35', 50' Lengths

M-FLEX Aluminum liner kits include:


  • UL tested and listed 2-ply "aluminum" liner
  • Aluminum mortar collar for slipping the liner through the thimble
  • Aluminum top plate w/ 16"X16" plate and 2" high collar around hole diameter
  • Aluminum cap
  • Easy to read installation instructions
  • 15 year warranty