Fireplaces and Chimneys

by Arthur H. Senner; T. A. H. Miller

Area of fireplace opening	Outside dimensions of standard rectangular flue lining	Inside diameter of standard round flue lining
Square inches	Inches	Inches
600	8½ by 8½	10
800	8½ by 13	10
1,000	8½ by 18	12
1,200	8½ by 18	12
1,400	13 by 13	12
1,600	13 by 13	15
1,800	13 by 18	15
2,000	13 by 18	15
2,200	13 by 18	15
2,400	18 by 18	18
2,600	18 by 18	18
2,800	18 by 18	18
3,000	18 by 18	18

[D] Based on a flue area equal to one-twelfth the fireplace opening. Sec table 2 for areas of flue lining.

Number of Bricks

(1) Estimate the total volume of masonry by multiplying together the length, width, and height of the various sections ([fig. 39]).

Section	Length Feet		Width Feet		Height Feet		Volume Cubic feet
AB	6.0	by	2.75	by	12.66	=	209.0
BC	4.25	by	2.5	by	1.66	=	17.6
CD	3.5	by	2.0	by	2.0	=	14.0
DE	3.5	by	1.75	by	10.16	=	62.2
EF	4.33	by	2.5	by	6.0	=	65.0
Total volume including voids							367.8

(2) Estimate the total volume of voids by multiplying together their length, width, and height.

Item	Length Feet	=	Width Feet	=	=	Height Feet	=	Volume Cubic feet
Ash-pit	2.33	by	1.5		by	7.0	=	24 46
Fireplace	3.0	by	1.5		by	3.5	=	15.75
Smoke chamber	2.0	by	1.16		by	2.0	=	4.64
8½- by 13-inch flue[E]			0.78	square feet	by	28 5	=	22.23
13- by 13-inch flue[E]			1.20	square feet	by	18.75	=	22.50
8½- by 8½-inch flue[E]			.50	square feet	by	18.75	=	9.37
Total volume of voids								98.95

[E] See [table 2] for outside areas of flues in square feet.

(3) Subtract volume of voids from volume of masonry.