Fireplace Flue Size Specifications Relation of fireplace size to flue opening dimensions, Table of required chimney flue size and flue dimensions for masonry fireplaces. To provide adequate draft and safe venting of combustion products the chimney flue f
Shown here is Mason-Lite's more-sophisticated chart giving fireplace flue sizing for masonry fireplaces relates fireplace opening dimensions (width and height) to the recommended chimney size where three parameters are given: chimney inside diameter, flue area in sq .in. and chimney height in feet...