322.1 The following conditions shall be met for sensitive

areas or rooms:

(1) Thermostats and humidistats shall be either locally reset-

table and of the non-locking type or remotely resettable

(1) Thermostats and humidistats shall be either locally reset-

table and of the non-locking type or remotely resettable and of the locking type. (2) Systems shall be capable of maintaining the rooms within

the temperature range in Table 4-A during normal oper-

(2) Systems shall be capable of maintaining the rooms within

the temperature range in Table 4-A during normal oper- ation. Lower or higher temperature shall be permitted when patients’ comfort and/or medical conditions require those conditions. (3) The humidity ranges listed in Table 4-A are the minimum

and maximum limits where control is specifically needed.

(3) The humidity ranges listed in Table 4-A are the minimum

and maximum limits where control is specifically needed. (4) Types of intensive care service spaces are listed in the

California Building Code.

California Building Code.

2019 CALIFORNIA MECHANICAL CODE 57

GENERAL REGULATIONS any other purpose or distributed to any other persons or parti es.

TABLE 303.10.1 REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTION ^{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}

Notes:

1

Notes:

1 Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing. 2 Clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appliance, disregarding an intervening protection applied to the combustible material. 3 Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite the appliance or connector. 4 Where clearance reduction systems use a ventilated air space, a provision for air circulation shall be provided as described. [See Figure 303.10.1(2) and Figure 303.10.1(3)] 5 There shall be not less than 1 inch (25.4 mm) between clearance reduction systems and combustible walls and ceilings for reduction systems using a ventilated air space. 6 Where a wall protector is mounted on a single flat wall away from corners, it shall have not less than a 1 inch (25.4 mm) air gap. To provide air circulation, the bottom and top edges, or the side and top edges, or edges shall be left open. 7 Mineral wool batts (blanket or board) shall have a density of not less than 8 pounds per cubic foot (lb/ft3) (128 kg/m3) and a minimum melting point of 1500°F (816°C). 8 Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1 British thermal unit inch per hour square foot degree Fahrenheit [Btu•in/(h•ft ² •°F)] [0.1W/(m•K)] or less. 9 There shall be not less than 1 inch (25.4 mm) between the appliance and the protector. In no case shall the clearance between the appliance and the combustible surface be reduced below that allowed in this table. 10 Clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable. 11 Listed single-wall connectors shall be installed in accordance with the terms of their listing and the manufacturer’s installation instructions.

58 2019 CALIFORNIA MECHANICAL CODE

GENERAL REGULATIONS

Notes: 2 B – Equals the reduced clearance permitted in accordance with Table 303.10.1. 3 The protection applied to the construction using combustible material shall extend far enough in each direction to make C equal to A.

For SI units: 1 inch = 25.4 mm

FIGURE 303.10.1(3) MASONRY CLEARANCE REDUCTION SYSTEM

[NFPA 54: FIGURE 10.3.2.3(c)]

Note: Masonry walls shall be permitted to be attached to combustible walls using wall ties. Spacers shall not be used directly behind appliance or connector.

FIGURE 303.10.1(2) WALL PROTECTOR CLEARANCE REDUCTION SYSTEM

[NFPA 54: FIGURE 10.3.2.3(b)]

2019 CALIFORNIA MECHANICAL CODE 59

FIGURE 303.10.1(1)1, 2, 3

EXTENT OF PROTECTION NECESSARY TO REDUCE CLEARANCES FROM GAS APPLIANCES OR VENT CONNECTORS

[NFPA 54: FIGURE 10.3.2.3(a)]

GENERAL REGULATIONS any other purpose or distributed to any other persons or parti es.

Notes:

first approved by the Authority Having Jurisdiction. 1 Support adjacent to joint, not to exceed 18 inches (457 mm). 2 Brace not to exceed 40 feet (12 192 mm) intervals to prevent horizontal movement. 3 Support at each horizontal branch connection. 4 Hangers shall not be placed on the coupling. 5 Vertical water lines shall be permitted to be supported in accordance with recognized engineering principles with regard to expansion and contraction, where

60 2019 CALIFORNIA MECHANICAL CODE

CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE