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7776 BOCA Basic
Mechanical Code / 1975



SECOND EDITION



As recommended and maintained
by the active memberslilp of




BUILDING OFFICIALS & CODE ADMINISTRATORS
INTERNATIONAL, INC.

1313 East 60th St. • Chicago, Illinois 60637

Founded in 1915 312/947-2580



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NOTE: The BOCA Basic Codes are designed for adoption by state or local gov-
ernments by reference only. Jurisdictions adopting them may make necessary
additions, deletions and amendments in their adopting document Incorporation
of any part of the BOCA Basic Codes in codes published by states, local govern-
ments, regulatoiy agencies, individuals or organizations is expressly prohibited.
When your jurisclictiofi has adopted one or more of the BOCA Basic Codes, please
send a copy of the adopting document to: Executive Director, BOCA International,
1313 East 60th Street, Chicago, Illinois 60637.

Jurisdictions wishing to adopt the BOCA Basic Mechanical Code, 1975, as an en-
forceable regulation governing mechanical equipment and use, should make sure
certain factual information is included in the code text and adopting ordinance
at the time adoption is being considered by the appropriate governmental body.
The required information, which indicates applicability of the code to a particular
jurisdiction, can be itemized as follows:

1. The name of the jurisdiction should be inserted in the second line of Section
M'100.3 on Paee 1 of the code.

2. The date of adoption of the code should be inserted in the first line of Section
M'102.1 on Page 1 of the code.

3. The name of the furisdiction should be inserted in the second line of "Air for
combustion" in Section M'201.0 on Page 10 of the code.

4. The name of the jurisdiction should be inserted in the first line of "Department"
in Section M'201.0 on Page 16 of the code.

5. The name of the furisdiction should be inserted in the first line of "Fire depart-
ment" in Section M'201,0 on Page 18 of the code.

6. The name of the furisdiction should be inserted in the seventh line of "Gas" in
Section M'201.0 on Pase 20 of the code.

7. The name of the furisdiction should be inserted in the second line of "Rating
input" in Section M'201.0 on Page 25 of the code.

8. The doUar amoura should be inserted in the appropriate places in Table M'502
on Page 109 of the code.

9. The £)llar amount should be inserted in the third line of Section M-900.3 on
Page 199 of the code.

10. The name of the state should be inserted in the fifth line of Section M-904.1
on Page 217 of the code.

11. The name of the furisdiction should be inserted in the fifth line of Section
M-904.1 on Page 217 of the code.

12. The doUar amount should be inserted in the tenth line of Section M-l 117.1 on
Page 251 of the code.

Library of Congress No. 74-29494

Copyright, 1975, Building OfiBcials and Code Administrators International, Inc.

All rights reserved. No part of this book may be reproduced or transmitted in
any form or by any means, electronic or mechanical, including photocopy,
recording or by an information storage and retrieval system without advance
permission in u)riting from the publisher. For information, address: Building
Officials and Code Administrators Intematiorud, Inc., 1313 East 60th Street,
Chicago, Illinois 60637.

Printed in the United States of America

by the Interstate Printers and Publishers, Inc.

Danville, Illinois

"Irst printing! March, 1975

econd printing: July, 1975

lird printing: January, 1976 ^ t

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PREFACE



The Basic Mechanical Code was initially prepared and updated on the
premise that adequate code requirements are essential to the safe instal-
lation and maintenance of all mechanical equipment in order to protect
the public safety, health, and welfare.

The Basic Mechanical Cede sets forth comprehensive regulations for
the safe installation and maintenance of mechanical facilities where great
reliance was previously placed on accepted practice and engineering
standards. By establishing the end result to be accomplished ramer than
the method to be followed, the Basic Mechanical Code allows freedom
and flexibility in the development of mechanical systems. It accepts na-
tionally recognized standards as the criteria for determining the perfor-
mance of materials and systems of construction.

This code, as are the other Basic Codes published by Building Officials
and Code Administrators International, Inc., is kept up to date through
the review of changes proposed by code enforcement officials, industry
and design professionals, and other interested persons and organizations.
Changes approved by BOCA's active membership are publisned in sup-
plements to the code, and completely new editions, such as this, are pre-
pared every three years, containing all approved changes since the pre-
vious edition.

This second edition presents the Basic Mechanical Code as originally
issued with changes through 1974 and with certain editorial changes
made to maintain the sequence of the code, to correct obvious errors, and
to update the references to standards. The second edition of the Basic
Mechanical Code is the product of many meetings and much correspon-
dence on the part of the Basic Mechanical Ctode Committee, wnose
members gave freely of their time to develop and maintain this code. It is
also the result of input from code administrators and others concerned
with effective code regulation and enforcement.

Use of the Basic Mechanical Code or any of the other BOCA Basic
Codes within a government jurisdiction may be accomplished only
through adoption by reference in a proceeding of the jurisdiction's board,
council, or other authoritative governing body. At the time of adoption,
jurisdictions should insert the appropriate information in those passages
of a code requiring specific local information, such as the date of adop-
tion, name of adopting jurisdiction, dollar amount of fines and permit
costs, etc. These passages are shown in bracketed italics in the codes, and
are also listed on the copyright page of each code for which the local
adoption information is required. In addition, jurisdictions may amend
or modify Basic Code provisions to accomplish desired local require-
ments, although use of die codes in substantially original and standard-
ized form is encouraged by the BOCA organization. Sample drafts of
adopting ordinances for each of the BOCA Basic Codes are available
free of charge upon request to BOCA International.

Hi

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TABLE OF CONTENTS



Article 1 ADMINISTRATION AND ENFORCEMENT

Section

M-100.0 Scope

M-101.0 Purpose and intent

M-102.0 Effective date

M-103.0 Maintenance

M-104.0 Matter covered

M-105.0 Validity of other regulations

M-106.0 Partial invalidity

M-107.0 Unlawful acts

M-108.0 Adoption by reference

M-109.0 New mechanical systems

M-110.0 Installation or repairs affecting building structures

M-IU.O Existing mechanical systems

M-112.0 Permits for mechanical work

M-113.0 Requirements for permits

M-114.0 Fees

M-115.0 Inspections

M-116.0 Credentials required

M-117.0 Condemnation procedures

M-118.0 Violations

M-119.0 Means of appeal

M-120.0 Approvals of new systems

Article 2 DEFINITIONS

M-200.0 General

M-201.0 General definitions



Article 3 HEATING, COOLING AND VENTILATING



29



M-300.0
M-301.0



M-302.0

M-303.0
M-304.0
M-305.0
M-306.0
M-307.0
M-308.0



General

Warm air heating, ventilating and air conditioning systems
(all occupancies except one- and two-family dwelling occu-
pancies)

Warm air heating, ventilating and air conditioning systems
in one- and two-family dwellings
Furnace locations and clearances (all occupancies)
Clearance and controls
Heating equipment located in attic spaces
Appliances on roofs

Heating equipment located in crawl spaces
Floor furnaces (one- and two-family dwellings)



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THE BOCA BASIC MECHANICAL CODE/1975



Article 3-continued



Stction
M-309.0

M-310.0
M-311.0
M-312.0
M-313.0
M-314.0
M-315.0
M-316.0
M.317.0
M-318.0
M-319.0



M-320.0
M-321.0
M-322.0
M-323.0
M-324.0
M-325.0
M-326.0
M-327.0



Heating and ventilating equipment In hazardous occu-
pancies

Service stations
Space (room) heaters

Infrared space heaters (gas-fired and oil-fired)
Suspended fuel-fired unit heaters
Gravity warm air systems
Conversion burners In warm air furnaces
Direct gas-fired makeup air heaters
Ventilation
Fans and blowers

Blower and exhaust systems for removing dust, stock, and
vapors (excluding paint spray rooms and booths and single
family occupancy)
Commercial cooking appliances
Commercial hoods and fans
Domestic ranges and plates
Clothes dryers
Filters

Fire dampers

Underground duct systems
Evaporative cooling



Article 4 STEAM AND HOT WATER HEATING SYSTEMS

AND PROCESS PIPING 80

M-400.0 General

M-401.0 Boilers or generators (steam and hot water)

M-402.0 Headers and connections on steam boilers

M-403.0 Boilers in parallel batteries

M-404.0 Hartford tee and equalizing pipe requirements

M-405.0 Safety or relief valves and reducing valves

M-406.0 Water level and steam pressure gauges and try-cocks

M-407.0 Blow-off valves

M-408.0 Low water cut-off controls, water feeders

M-409.0 Piping for steam and hot water heating systems

M-410.0 Pitch of piping

M-411.0 Expansion tanks

M-412.0 Low-water cut-off, hot water heating boilers

M-413.0 Water supply connections

M-414.0 (aauges and thermometers

M-415.0 Heating with steam from utility central steam heating

system or other types of steam distributing systems

M-416.0 Gas, oil and solid fuel burners

M-417.0 Radiant heating systems

M-418.0 Chimneys, flues, vents and combustion air

M-419.0 Blow-off tanks



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TAIU OF eONTENIS



Article 4-continued



Stction
M-420.0

M-421.0
M-422X)
M-423.0
M-424.0

Article 5



Hot water storage tanks, hot water heaters, tankless type
water heaters and equipment: construction and moving
Boiling-out procedure for steam boilers and generators
Cleaning procedure, hot water system
Boiler and generator settings and clearances
Welding of pipe joints



BOILERS AND PRESSURE VESSELS,
MAINTENANCE AND INSPECTION



106



M-5(X).0 General

M-501.0 Inspections

M-502.0 Annual inspection fees

M-503.0 Condemnation



Article 6



M-600.0
M-601.0
M-602.0
M-603.0
M-604.0
M-605.0
M-606.0
M-607.0
M-608.0
M-609.0
M-610.0

M-611.0
M-612.0
M-613.0
M-614.0
M-615.0
M-616.0
M-617.0
M-618.0
M-619.0
M-620.0
M-621.0
M-622.0
M-623.0
M-624.0
M-625.0
M-626.0
M-627.0
M-628.0



GAS, LIQUID AND SOLID FUEL
PIPING AND EQUIPMENT



110



General

House gas piping

Underground outside gas piping

Sizing of gas piping

Minimum size of gas pipe

Leak test methods for gas piping systems

Purging gas piping

Capped outlets for gas piping

Fuel oil tanks and equipment

Erection and installation of appliances

Required air for combustion, ventilation and draft hood

dilution

Chimneys and vents

Fuel-fired appliances

Gas ranges and plates

Gas refrigerators

Water heaters

Steam and hot water boilers

Forced air furnaces

Gravity warm air furnaces

Floor and wall-type furnaces

Unit heaters

Fuel conversions

Laundry equipment

Free standing incinerators, gas-fired

Fuel-fired industrial type equipment

Miscellaneous gas burning appliances

Unauthorized devices

Electrical wiring and controls

Special equipment



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THE BOCA BASIC MECHANICAL C0BE/197S



Article 7 CHIMNEYS AND VENTS



140



Stction

M-700.0 General

M-701.0 Types of chimneys

M-702.0 Masonry chimneys, general requirements

M-703.0 Masonry chimneys for residential-type appliances

M-704.0 Masonry chimneys for low-heat appliances

M-705.0 Masonry chimneys for medium-heat appliances

M-706.0 Masonry chimneys for high-heat appliances

M-707.0 Masonry chimneys for residential-type incinerators

M-706.0 Masonry chimneys for chute-fed and flue-fed incinerators

M-709.0 Masonry chimneys for commercial and industrial-type

incinerators

M-710.0 Metal chimneys (smokestacks), general requirements

M-711.0 Metal chimneys for residential-type or low-heat

appliances

M-712.0 Metal chimneys for medium-heat appliances

M-713.0 Metal chimneys for high-heat appliances

M-714.0 Metal chimneys for residential-type incinerators

M-715.0 Metal chimneys for commercial and industrial-type

incinerators

M-716.0 Venting systems

M-717.0 Installation requirements for vents

M-718.0 Chimney connectors and vent connectors

M-719.0 Special venting arrangements



Article 8 MECHANICAL REFRIGERATION



165



M-800.0 Scope and purpose

M-801.0 Definitions

M-802.0 Occupancy classifications

M-803.0 Refrigerating systems classification by type

M-804.0 Refrigerant classification

M-805.0 Requirements for institutional, public assembly, residential

and commercial occupancies

M-806.0 Requirements for industrial occupancies

M-807.0 Design and construction of equipment

M-808.0 Pressure-limiting devices

M-809.0 Pressure-relief protection

M-810.0 Installation requirements

M-811.0 Field tests

M-812.0 General requirements

Article 9 INCINERATORS, CREMATORIES, FIREPLACES

AND BARBECUES 199

M-900.0 General

M-901.0 Domestic gas-fired incinerators

M-902.0 Commercial and industrial incinerators

M-903.0 Refuse and trash chutes



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TABLE OF CONTENTS



Article 9-continued

Stction

M-904.0 Crematories

M-905.0 Fireplaces

M-906.0 Fixed barbecue pits

Article 10 FIRE SUPPRESSION SYSTEMS



223



M-1000.0 General

M-1001.0 Definitions

M-1002.0 Plans and specifications

M-1003.0 Fire suppression systems

M-1004.0 Suppression system selection

M-1005.0 Water sprinkler systems

M-1006.0 Limited area sprinkler systems

M-1007.0 Water spray fixed systems

M-1008.0 Foam extinguishing systems

M-1009.0 Carbon dioxide extinguishing systems

M-1010.0 Halogenated extinguishing systems

M-IOU.O Dry chemical extinguishing systems

M-1012.0 Standpipe systems

M-1013.0 Standpipes for buildings under construction or demolition

M-1014.0 Fire department connections

M-1015.0 Water supply and other extinguishing supply media

M-1016.0 Supervision

M-1017.0 Yard hydrants



Article 11 AIR POLLUTION CONTROL



244



M-1100.0 Scope

M-1101.0 Purpose

M-1102.0 Entrance to premises

M-1103.0 Registration

M-1104.0 Permits

M-1105.0 Equipment and processes

M-1106.0 Particulate matter in gases

M-1107.0 Ringelmann standards

M-1108.0 Sulfur dioxide

M-1109.0 Visible emissions from internal combustion engines

M-1110.0 Storage of petroleum products

M-llU.O Reduction of animal matter

M-1112.0 Emission of settable acid and alkaline substances

M-1113.0 Incineration

M-1114.0 Open burning

M4115.0 Nuisance

M4116.0 Conditions not in violation of this article

M-1117.0 Penalties and offenses

M-1118.0 Right of appeal

M-1119.0 Variances

M-1120.0 Hearings

M-1121.0 Judicial review

M-1122.0 Additional remedies



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ix



LIST OF APPENDICES

Appendix A ACCREDITED AUTHORITATIVE AGENCIES

Appendix B ACCEPTED ENGINEERING PRACTICE STANDARDS

Appendix C MATERIAL STANDARDS

Appendix D WATER SPRINKLER SYSTEMS WITH BASIC
COMPONENTS



EDITORIAL CHANGES-THIRD PRINTING

1. Various references to municipality contained in the provisions of this code have

been changed to read jurisdiction.
pp. 12, 21 and 23, Section M-201.1: Several references to boilers under General

Definitions have been altered or deleted. The definition of Boiler in the Basic

Mechanical Code/75 has been replaced with the fuller definition of Boiler found in

the Basic Building Code/75. Deleted are the following definitions: p. 12, Boiler,

heating (low pressure); p. 21, High pressure (and temperature); and p. 23,

Low pressure (and temperature).
pg. 35, Section M-301.11: listing of fire damper locations now corresponds to wording

found in Section 1808.2 of the BOCA Basic Building Code/1975.
pg. 106, Section M-500.4: last line now reads . . . ing official or authorized pirisdic-

tional agency (see Section M'423.4).
pg. 124, Section M-612.4: last line now reads . . .
pg. 158, Section M-7 17.2.2: second line now reads

rial shall be guarded at the point of passage
pg. 158, Section M-7 17.2.2: line five now reads .

diameter than the vent pipe, unless
pg. 202, Section M-902.2.2: fourth line now reads

of gas travel at nine ( 9 ) feet per second shall
pg. 229, Section M-1003.21: line three in item eight now reads

M'1011.6.



code (see Section M-QOQ.O),

, . . structed of combustible mate-

. ators, four (4) inches larger in

. . . vertical direction. The length

. and Section



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ARTICLE 1

ADMINISTRATION AND ENFORCEMENT



SECTION M-100.0 SCOPE

M-100.1 General: The design and installation of mechanical systems,
including heating systems, ventilating systems, cooling systems, steam
and hot water heating systems, process piping, boilers and pressure ves-
sels, appliances utilizing gas, liquid or solid fuel, chimneys and vents,
mechanical refrigeration systems, fireplaces, barbecues, incinerators,
crematories, fire protection systems and air pollution control systems shall
comply with the requirements of this code.

M-100.2 Not included: Installation of plumbing systems, as defined
in the plumbing code, are not covered by the provisions of this code.

M-100.3 Title: This code shall be known as the Mechanical Code of
[name of jurisdiction] hereinafter referred to as the mechanical code or
"this code."

M-100.4 Code remedial: This code shall be construed liberally and
justly to insure public health, safety, and welfare insofar as they are
affected by the installation and maintenance of mechanical systems.

SECTION M-101.0 PURPOSE AND INTENT

M-101.1 General: It is the purpose and intent of this code to estab-
lish minimum standards in terms of performance objectives, implemented
by specific requirements, which will provide reasonable safeguards to
protect the public health and safety against the hazards of inadequate,
defective or unsafe mechanical installations.



SECTION M-102.0 EFFECTIVE DATE
M-1Q2.1 General: This code shall take effect on [date].

SECTION M-103JI MAINTENANCE

M-103.1 Generals All mechanical systems both existing and new, and
all parts thereof, shall be maintained in a safe condition. All devices or

1

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THE BOCA BASIC MECHANICAL CODE/1975

safeguards which are required by this code shall be maintained in good
working order. The owner or his designated agent shall be responsible for
the maintenance of mechanical systems.

SECTION M-104.0 MAHER COVERED

M-104.1 General: The provisions of this code shall apply to the
mechanical installations in all buildings and structures and their ap-
purtenant constructions.

SECTION M-105.0 VALIDITY OF OTHER REGULATIONS

M-105.1 General: Nothing in this code shall be construed to prevent
the enforcement of other ordinances or local regulations which prescribe
mechanical standards other than are provided herein.

SECTION M-106.0 PARTIAL INVALIDITY

M-106.1 General: If any article, term, part, provision, section, sub-
division or paragraph of this code shall be held unconstitutional, invalid,
or ineffective, in whole or in part by any court of competent jurisdiction,
such determination shall be deemed to invalidate only the article, sec-
tions, terms, provisions, subdivisions, paragraphs or parts thereof af-
fected, and it shall be presumed that this code would have been adopted
without such invalid portion, and that every other article, term, section,
subdivision, paragraph, provision or part of this code shall be deemed
valid and shall continue in full force and effect.



SECTION M-107.0 UNLAWFUL ACTS

M-107.1 General: It shall be unlawful to install, extend, alter, repair
or maintain mechanical systems in or adjacent to buildings except in con-
formity with this code.

SECTION M-108.0 ADOPTION BY REFERENCE

M-108.1 General: All of the nationally recognized standards appear-
ing in the text and appendices of this code are hereby adopted by
reference and incorporated into this code to the extent and with the
limitations set upon them in the specific sections wherein they are ap-
plicable. All portions of mechanical systems installed and maintained in
accordance with the regulations, specifications and standards listed in
Appendix A, Accredited Authoritative Agencies, Appendix B, Accepted
Engineering Practice, and Appendix C, Material and Test Standards,
shall be material, equipment, system or method of construction therein
specified and shall be deemed to meet the purpose and intent of this code.



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ABMINISTRATION AND ENFORCEMENT



SECTION M-109.0 NEW MECHANICAL SYSTEMS

M-109.1 General: This code shall apply to mechanical systems and
to parts thereof which are hereafter installed in buildings of the occu-
pancy and use group classifications as defined by the building code.

SECTION M-110.0 INSTALLATION OR REPAIRS AFFECTING



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