HomeSaver WindBeater Rectangular Stainless Steel CapThe small Rectangular WindBeater fits flues with minimum inside dimensions of 6.25" X 10", and provides 58.5" of cross-sectional area. It comes with a masonry adaptor with plate dimensions of 10" X 14". The small size is ideal for those 8" X 12" flue tiles.
The large Rectangular WindBeater fits flues with a minimum inside diameter of 10 5/16" X 14 1/4" and provides 146" of cross-sectional area. It comes complete with a masonry adaptor measuring 14" X 18". The large size is ideal for 12" X 16" flue tiles.
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