Wisconsin Administrative Code › Department of Safety and Professional Services › SPS 301-399 - Safety, Buildings, and Environment › SPS 320-325 - Uniform Dwelling Code › Chapter SPS 323 - Heating, Ventilating And Air Conditioning › Subchapter III - Systems › Section SPS 323.04 - Types and location of equipment

Current through June 24, 2024
(1) GENERAL.
(a) All heat producing appliances and cooling
					 appliances shall be listed by a testing agency acceptable to the
					 department.
(b) Installation and
					 maintenance of gas-fueled appliances shall comply with the appliance listing
					 and the requirements of NFPA 54, National Fuel Gas Code, except as otherwise
					 required under this chapter.
(c)
					 The clearances from combustible materials in Tables 323.04 -A and 323.04-B
					 shall apply unless otherwise shown on listed appliances.
TABLE 323.04-A
STANDARD INSTALLATION CLEARANCES (INCHES) FOR
						HEAT-PRODUCING APPLIANCES
Residential Type Appliances for
									 Installation in Rooms Which are Large (See Note 2)
Appliance1
Above Top of Casing or
									 Appliance
From Top and Sides of Warm-Air Bonnet or
									 Plenum
From Front See Note 3
From Back
From Sides
Boilers and Water Heaters
Automatic Oil
Steam Boilers - 15 psi
or
6
-
24
6
6
Water Boilers - 250° F
Comb. Gas-Oil
Water Heaters - 200° F
Automatic Gas
6
-
18
6
6
All Water Walls or Jacketed
Electric
6
-
18
6
6
Furnaces - Central
Automatic Oil
Gravity, Upflow, Downflow,
or
64
6
24
6
6
Horizontal and Duct,
Comb. Gas-Oil
Warm-Air - 250° F
Automatic Gas
64
6
18
6
6
Electric
64
6
18
6
6
Furnaces - Floor
Automatic Oil
For Mounting in Combustible Floors
or
36
-
12
12
12
Comb. Gas-Oil
Automatic Gas
36
-
12
12
12
Electric
36
-
12
12
12
Heat Exchanger
Steam - 15 psi Max.
Hot Water - 250° F Max.
-
1
1
1
1
1
Room Heaters
Circulating Type
Oil
36
-
24
12
12
Vented or Unvented
Gas
36
-
24
12
12
Radiant or Other Type
Oil
36
-
36
36
36
Vented or Unvented
Gas
36
-
36
18
18
Gas with dbl metal or ceramic back
36
-
36
12
18
Radiators
Steam or Hot Water
Gas
36
-
6
6
6
See Note 5
Firing Side
Opp. Side
Ranges - Cooking Stoves
Oil
30
-
-
-
Vented or Unvented
Gas
30
-
-
6
6
Electric
30
-
-
6
6
Clothes Dryers
Gas
6
-
24
6
6
Listed Types
Electric
6
-
24
0
0
Incinerators
See Note 6
Residential Types
-
36
-
48
36
36
1 Standard clearances may be
						reduced by affording protection to combustible material in accordance with
						Table 323.04-B.
2 Rooms which are large in
						comparison to the size of the appliance are those having a volume equal to at
						least 12 times the total volume of a furnace and at least 16 times the total
						volume of a boiler. If the actual ceiling height of a room is greater than 8
						feet, the volume of a room should be figured on the basis of a ceiling height
						of 8 feet.
3 The minimum dimension should
						be that necessary for servicing the appliance including access for cleaning and
						normal care, tube removal, etc.
4 For a listed oil,
						combination gas-oil, gas, or electric furnace this dimension may be 2 inches if
						the furnace limit control cannot be set higher than 250° F or this
						dimension may be one inch if the limit control cannot be set higher than
						200° F
5 To combustible material or
						metal cabinets. If the underside of such combustible material or metal cabinet
						is protected with asbestos millboard at least 1/4-inch thick covered with sheet
						metal of not less than No. 28 gauge, the distance may be not less than 24
						inches. Also, if the manufacturer of the range, cooktop, or cooking stove
						specifies a shorter clearance, that clearance may be used instead.
6 Clearance above charging
						door should be not less than 48 inches.
TABLE 323.04-B
CLEARANCES, INCHES, WITH SPECIFIED FORMS OF
						PROTECTION*
Type of Protection
Applied to the combustible material
									 unless otherwise specified and covering all surfaces within the distance
									 specified as the required clearance with no protection. Thicknesses are
									 minimum.
Where required clearance with no
									 projection is:
36 inches
18 inches
12 inches
6 inches
Above
Sides & Rear
Vent Connector
Above
Sides & Rear
Vent Connector
Above
Sides & Rear
Vent Connector
Above
Sides & Rear
Vent Connector
(a) 1/4-in. insulating millboard** spaced out
									 1"***
30
18
30
15
9
12
9
6
6
3
2
3
(b) 28 gage sheet metal on 1/4" insulating
									 millboard**
24
18
24
12
9
12
9
6
4
3
2
2
(c) 28 gage sheet metal spaced out 1"***
18
12
18
9
6
9
6
4
4
2
2
2
(d) 28 gage sheet metal on 1/4" insulating
									 millboard** spaced out 1"***
18
12
18
9
6
9
6
4
4
2
2
2
(e) 1/4" insulated millboard** on 1" mineral
									 wool batts reinforced with wire mesh or equivalent
18
12
18
6
6
6
4
4
4
2
2
2
(f) 22 gage sheet metal on 1" mineral wool
									 batts reinforced with wire or equivalent
18
12
12
4
3
3
2
2
2
2
2
2
(g) 1/4" insulated millboard**
36
36
36
18
18
18
12
12
9
4
4
4
*All clearances shall be measured from the outer surface
						of the equipment to the combustible material disregarding any intervening
						protection applied to the combustible material.
**A factory fabricated board formed with noncombustible
						materials, normally fibers, and having a thermal conductivity in the range of 1
						Btu inch per square foot per °F, or less.
***Spacers shall be of noncombustible material.