Liners

 

Liners – aluminum versus stainless steel

Aluminum – An 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. By relining the chimney with an aluminum liner you can reduce the condensation problems and improve the performance of the appliance.

Stainless steel / corrugated – M-flex 316 is designed to reline existing chimneys or be used in new construction. It’s corrugated construction allows for expansion and contraction during the heat up and cool down periods. This liner would be used in standard furnace flues and fireplace flues installations.

Stainless steel / smoothwall - M-flex 316 smoothwall is used when relining furnace flues when the flue is too small for the proposed BTUs. The smooth design adds back the 20% drag factor lost in traditional corrugated liners. This comes in very handy when venting multiple appliances and limited flue space.

Please visit our M-Flex Liner page for additional information.