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The output of a radiator is measured in square feet of radiation. To determine the number of
square feet of radiation in a radiator:

1. Measure the height of the radiator.
2. Count the number of columns in a section.
3. Count the number of sections.

Multiply the total number of sections by the number of square feet per section as
shown in the following tables:

SQ. FT. RADIATION PER SECTION

Height

One

Two

Three

Four

Inches

Column

Column

Column

Column

Window

13

—

—

—

—

3

16

—

—

—

—

3

3

⁄

4

18

—

—

2

1

⁄

4

3

4

1

⁄

4

20

1

1

⁄

2

2

—

—

5

22

—

—

3

4

—

23

1

2

⁄

3

2

1

⁄

3

—

—

—

26

2

2

2

⁄

3

3

3

⁄

4

5

—

32

2

1

⁄

2

3

1

⁄

3

4

1

⁄

2

6

1

⁄

2

—

38

3

4

5

8

—

45

—

5

6

10

—

SQ. FT. RADIATION PER SECTION

Height

Three

Four

Five

Six

Window

Inches

Tube

Tube

Tube

Tube

Seven Tube

14

—

—

—

—

2

1

⁄

2

17

—

—

—

—

3

20

1

3

⁄

4

2

1

⁄

4

2

2

⁄

3

3

3

2

⁄

3

23

2

2

1

⁄

2

3

3

1

⁄

2

—

26

2

1

⁄

3

2

3

⁄

4

3

1

⁄

2

4

4

3

⁄

4

32

3

3

1

⁄

2

4

1

⁄

3

5

—

38

3

1

⁄

2

4

1

⁄

4

5

6

—

SQ. FT. RADIATION PER WALL RADIATOR SECTION

Type of

Height

Length or

Thickness

Heating Sq. Ft.

Section

Inches

Width, In.

Inches

Radiation

5-A

13

5

⁄

16

16

5

⁄

8

2

7

⁄

8

5

7-A

13

5

⁄

16

21

7

⁄

8

2

7

⁄

8

7

7-B

21

7

⁄

8

13

3

⁄

16

3

1

⁄

16

7

9-A

18

5

⁄

16

29

1

⁄

16

2

7

⁄

8

9

9-B

29

1

⁄

16

18

5

⁄

16

3

11

⁄

16

9

Wall radiators are measured by their height, length and thickness. The following shows the
number of square feet of heating surface per section:

38”

7 SECTIONS

5 TUBE

16

7

⁄

8

13

11

⁄

16

36”

7 SECTIONS

2 COL