TIN REGISTER BOXES _Quantities and Cost_ Three 14" × 16" × 4", at 80 cents $ 2.40 One 7" × 10" × 4" .57 Two 10" × 12" × 4", at 75 cents 1.50 Two 15" × 12" × 4", at 75 cents 1.50 Two 7" × 9" × 4", at 57 cents 1.14 Labor, one-third of cost of materials 2.37 ------ Total $ 9.48 MISCELLANEOUS _Quantities and Cost_ Fifteen elbows, 10 in. in diameter, at 35 cents $ 5.25 Two elbows, 8 in. in diameter, at 25 cents .50 Ten sheets of "IC" tin, 20" × 28", at 20 cents 2.00 Two cold-air boxes, each 24 ft. long, of 20-inch earthen pipe, with two slide dampers and screens 38.40 Labor: one-third of cost of materials 15.38 ------ Total $61.53 _Summary_ Furnace $125.00 Warm-air and smoke pipes 32.88 Registers and borders 31.16 Register boxes 9.48 Miscellaneous 61.53 ------- Total cost of heating and ventilating system $260.05 PLUMBING =11.= A complete list of the plumbing fixtures, together with the sizes, lengths, and materials of all pipes, should be tabulated so that any item can be easily referred to in case of alteration in the schedule.