1"

2"

3"

4"

5"

6"

8"

9"

10"

12"

Aluminum

Brass

Oilboard

Plastic

Stainless Steel

Steel

Wood

Blank

Letter

Letter and Number

Number

Punctuation

2"

2 1/4"

3"

3 1/8"

4"

4 1/8"

5"

5 1/4"

6"

7"

7 1/4"

8"

9"

10"

10 7/8"

12"

14"

18"

19 1/2"

39"

46"

51"

Character

Message

Symbol

Technical

Inch

Metric

Electrical/Electronic

Flow

Flowchart

Heating and Air Conditioning

House and Plumbing

Pipe Fittings

Sheet Metal Conduit

Exempt

Compliant

Not Compliant

Compliant

Not Compliant

5"

6"

7"

7 1/4"

8"

9"

9 3/8"

9 3/4"

9 7/8"

10"

10 1/8"

10 1/2"

11"

11 1/8"

11 1/2"

12"

20"

24"

30"

36"

48"

60"

72"

96"

120"

300 mm

500 mm

1,000 mm

1C995

EAR99

Accessible

Arrow

Circle

Diamond

Ellipse (20°, 30°, 40°, and 50° Projections)

Hexagon

Isometric Ellipse (25°, 35°, 45°, and 60° Projections)

No Parking

No Smoking

Square

Triangle

1 1/4"

1 1/2"

2"

2 1/4"

2 3/4"

3"

3 1/4"

3 3/8"

3 3/4"

4"

4 3/8"

4 1/2"

4 5/8"

4 3/4"

5"

5 1/16"

5 1/4"

5 1/2"

5 7/8"

7"

7 5/8"

8"

8 3/4"

8 13/16"

9"

10"

19 1/2"

20"

36"

45 1/2"

46"

70"

75"

1"

2"

2 1/2"

3"

4"

6"

12"

5"

7"

7 1/4"

8"

9"

9 3/8"

9 3/4"

9 7/8"

10"

10 1/8"

10 1/2"

11"

11 1/2"

12"

13

33

39

41

42

44

46

56

60

61

81

Computer flow symbols conform to ANSI X3.5 and ISO 1028

Cross sections for heating and air conditioning

For pipe and plumbing layout: gas, oil, water, and chemical

House plan and plumbing fixtures

Symbols conform to ASA Z32.2.3 and 32.2.4

Symbols for pipe OD, end bell, flange, and fittings

Symbols, contacts, switches, terminals, etc. Conform to ANSI Y32.2 (Set of 3)

Caution

Fire Lane

Keep Aisle Clear

No Parking

No Smoking

Reserved

Visitors

Circle

Left Curves

Right Curves

Straight

4"

10"

12 cm

25 cm

1 mm