Show Proper Design Helps Chimney Remove Smoke Shape Size of Flue Control It is curious that so many fire fireplaces places smoke when it is so simple to build one that dont don't The recipe according to an expert in the Washington Washington Washington Wash Wash- ington Post Is about ns as follows Determine the size of ot opening desired desired desired de de- sired and then select a flue lining that has an m area equal to at least 10 per cent of that opening Use either a square or a round flue preferably a round one as that is the more efficient Do not use rectangular flues unless absolutely necessary and in that case increase the size so that the area will equal at least 12 per cent of the opening Build the fireplace with a depth of between 18 and 24 inches More than that depth robs the fireplace of a good deal of its heating effi Install a Iron cast damper for the full fuU width of the opening This should be set so that the curving curving curving ing back of the fireplace makes a continuous line with the back of the damper opening Above the damper at the back flush with the top edge o of the opening opening open open- ing inc build a horizontal smoke shelf about eight inches deep and for tor the full width of the opening Also above the damper build a smoke cham cham- ber with the front rising as a continuation continuation continuation con con- of the front piece of ot the damper opening and the back rising perpendicular the to smoke shelf shell The sides should slope up at an angle of about 60 degrees with the horizontal This smoke chamber must be perfectly symmetrical and the first tile of ot the flue lining must start at its apex directly over the center of the fireplace This first tile must be perpendicular lar but succeeding but edIng ones may be set at an angle to pull the flue over as the exigencies of the situation may demand Turns should be made as gradual as possible and slopes inthe in inthe inthe the flue should be at nt an angle of not less than 45 degrees Each flue must be absolutely Independent from fireplace to chimney top |