Signage - General.
Municipal Code of Chicago § 18-28-1101.5
in effect18-28-1101.5 Signage - General.
Every refrigeration system, containing over 100 pounds (45.36 kg) of refrigerant, must have posted as near as practicable to the pressure imposing element of such system a sign having letters not less than 1 inch in height with the wording:
HIGH PRESSURE REFRIGERANT – DANGER UN REFRIGERANTE DE ALTA PRESION – PELIGRO
All refrigeration piping shall be coded at 30 foot (9.144 m) intervals and in every separate area through which the piping extends. A permanent means of identification shall be affixed, having a yellow background and black letters legible from the work floor, dimensioned according to the table below and with the following wording:
HIGH PRESSURE REFRIGERANT – DANGER UN REFRIGERANTE DE ALTA PRESION – PELIGRO
Pipe Labeling
Outer Diameter of Pipe Covering or Lagging (In Inches) | Letter Heights (In Inches)
3/4 to 1 1/4 | 1/2
1 1/2 to 2 | 3/4
2 1/2 to 8 | 1 1/4
8 1/4 to 10 | 2 1/2
Over 10 | 3 1/2
The background of the sign shall be yellow, with black letters.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2688685Fetched: 10/24/2026