Size

4"

4 1/2"

5"

5 1/2"

6"

7"

8"

Pound ........

1

1 1/4

1 1/2

1 3/4

2 1/4

2 3/4

3 1/4

Cost..

.18

.20

.23

.25

.28

.32

.35

Tin, per Sheet

DC

12 1/2x 17

.05

IX

14 x 20

.07

IXX

14 x20

.08

IX

20 x 23

.12

IX

20 x 26

.13

IX

20 x 29 1/2

.16

IX

20 x 32 1/2

.17

Miscellaneous Data

Galvanized sheet iron per lb.

$0.05

Common sheet iron per lb.

.04

Zinc per lb.

$0.10

Wrought iron per lb.

.04

Galvanized piping per lb.

.09

Galvanized cold air box per lb.

.09

Galvanized furnace shields per sq. ft.

.08

Register box netting per sq. ft.

.05

Asbestos paper at 1 1/2 lbs. per sq. yd.

.05

Figure cold air supply 3/4 combined area of piping.

Register grilles take up 1/3 of area of register.

Locate registers nearest convenient point to furnace, inside part of room preferred. Locate furnace so that all pipes will be as nearly equal in length as possible.

Estimate pipes by lineal foot, but elbows and dampers separately, also registers with boxes and borders.

Allow from $1.00 to $1.25 for flange connection of cold air box to furnace casing.

Cover all risers with asbestos paper in partitions.