LIS

Administrative Code

Creating a Report: Check the sections you'd like to appear in the report, then use the "Create Report" button at the bottom of the page to generate your report. Once the report is generated you'll then have the option to download it as a pdf, print or email the report.

Virginia Administrative Code
Title 16. Labor And Employment
Agency 25. Safety And Health Codes Board
Chapter 50. Boiler and Pressure Vessel Regulations
11/5/2024

16VAC25-50-530. Air and ventilation requirements.

A permanent source of outside air shall be provided for each boiler room to permit satisfactory combustion of the fuel as well as proper ventilation of the boiler room under normal operating conditions.

A. The total requirements of the burners for all fired pressure vessels in the boiler room must be used to determine the louver sizes whether fired by coal, oil or gas; however, the minimum net free louvered area must not be less than one square foot. The following table or formula shall be used to determine the net louvered area in square feet:

Input BTU Per Hour

Required Air
Cu. Ft./Min.

Min. Net Louvered Area
Sq. Ft.

500,000

125

1.0

1,000,000

250

1.0

2,000,000

500

1.6

3,000,000

750

2.5

4,000,000

1,000

3.3

5,000,000

1,250

4.1

6,000,000

1,500

5.0

7,000,000

1,750

5.8

8,000,000

2,000

6.6

9,000,000

2,250

7.5

10,000,000

2,500

8.3

B. When mechanical ventilation is used instead of subsection A of this section, the supply of combustion and ventilation air to the boiler room and the firing device shall be interlocked with the fan so the firing device will not operate with the fan off. The velocity of the air through the ventilating fan shall not exceed 500 feet per minute and the total air delivered shall be equal to or greater than shown in this section.

Statutory Authority

§§ 40.1-22 and 40.1-51.5 et seq. of the Code of Virginia.

Historical Notes

Derived from VR425-01-75 § 4.15, eff. July 1, 1974; amended, eff. November 1, 1978; July 1, 1991; September 1, 1993.

Website addresses provided in the Virginia Administrative Code to documents incorporated by reference are for the reader's convenience only, may not necessarily be active or current, and should not be relied upon. To ensure the information incorporated by reference is accurate, the reader is encouraged to use the source document described in the regulation.

As a service to the public, the Virginia Administrative Code is provided online by the Virginia General Assembly. We are unable to answer legal questions or respond to requests for legal advice, including application of law to specific fact. To understand and protect your legal rights, you should consult an attorney.