Rheem 801C Series User Manual

16
A. Where directly communicating with the outdoors through an
opening or where communicating to the outdoors through
vertical ducts as shown in Figure 11, each opening shall
have a minimum free area of 1 square inch for each 4,000
BTUH of total appliance input rating of all equipment in the
enclosure. Table 3 species the minimum area for
each of the 2 combustion air openings and minimum round
duct diameter for direct openings and vertical ducting only.
B. Where communicating with the outdoors through hori-
zontal ducts, each opening shall have a minimum free area
of 1 square inch for each 2,000 BTUH of total appliance
input rating of all equipment in the enclosure (see Figure
12). Table 4 species the minimum area for each of the 2
combustion air openings and minimum round duct diameter
for horizontal ducting only.
METHOD 2:
One permanent opening located within 12 inches of the top
of the enclosure, shall be permitted where the equipment
has clearances of at least 1 inch from the sides and back
and 6 inches from the front of the appliance. The opening
shall directly communicate with the outdoors or communi-
cate through a vertical or horizontal duct to the outdoors or
spaces (crawl or attic) that freely communicate with the out-
doors, and shall have a minimum of:
TABLE 9 : MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
OUTSIDE THROUGH AN OPENING OR
THROUGH A VERTICAL VENT DUCT.*
Total Input for
ALL Gas
Appliances
(BTUH)
Free Area for
Each Opening
when 2 Separate
Openings are
used (sq inches)
Round Pipe Duct
Diameter (Vercal
Duct Only) (inches)
50,000 13 5
75,000 19 5
100,000 25 6
125,000 32 8
150,000 38 8
TABLE 1 0: MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
OUTSIDE THROUGH A H ORIZONTAL DUCT.
Total Input for
ALL Gas
Appliances
(BTUH)
Free Area for
Each Opening
when 2 Separate
Openings are
used (sq inches)
Round Pipe Duct
Diameter
(Horizontal Duct
Only) (inches)
50,000 25 6
75,000 38 8
100,000 50 8
125,000 63 10
150,000 75 10
TABLE 1 1: MINIMUM FREE AREA REQUIRED
FOR AN OPENING (WHEN O N E OPENING IS
USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
*
Total I nput for
ALL Gas
Appliances
(BTUH)
Free Area for an
Opening when 1
Opening is used
(sq inches)
Round Pipe Duct
Diameter (inches)
50,000 25 6
75,000 38 8
100,000 50 8
125,000 63 10
150,000 75 10
OUTSIDE.
TABLE 3: MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
3. OUTSIDE THROUGH AN OPENING OR
3. THROUGH A VERTICAL DUCT.
Combustion Air
COMBUSTION AND VENTILATION AIR (cont.)
TABLE 9 : MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
OUTSIDE THROUGH AN OPENING OR
THROUGH A VERTICAL VENT DUCT.*
Total Input for
ALL Gas
Appliances
(BTUH)
Free Area for
Each Opening
when 2 Separate
Openings are
used (sq inches)
Round Pipe Duct
Diameter (Vercal
Duct Only) (inches)
50,000 13 5
75,000 19 5
100,000 25 6
125,000 32 8
150,000 38 8
TABLE 1 0: MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
OUTSIDE THROUGH A H ORIZONTAL DUCT.
Total Input for
ALL Gas
Appliances
(BTUH)
Free Area for
Each Opening
when 2 Separate
Openings are
used (sq inches)
Round Pipe Duct
Diameter
(Horizontal Duct
Only) (inches)
50,000 25 6
75,000 38 8
100,000 50 8
125,000 63 10
150,000 75 10
TABLE 1 1: MINIMUM FREE AREA REQUIRED
FOR AN OPENING (WHEN O N E OPENING IS
USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
*
Total I nput for
ALL Gas
Appliances
(BTUH)
Free Area for an
Opening when 1
Opening is used
(sq inches)
Round Pipe Duct
Diameter (inches)
50,000 25 6
75,000 38 8
100,000 50 8
125,000 63 10
150,000 75 10
OUTSIDE.
TABLE 4: MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
3. OUTSIDE THROUGH A HORIZONTAL DUCT.
TABLE 9 : MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
OUTSIDE THROUGH AN OPENING OR
THROUGH A VERTICAL VENT DUCT.*
Total Input for
ALL Gas
Appliances
(BTUH)
Free Area for
Each Opening
when 2 Separate
Openings are
used (sq inches)
Round Pipe Duct
Diameter (Vercal
Duct Only) (inches)
50,000 13 5
75,000 19 5
100,000 25 6
125,000 32 8
150,000 38 8
TABLE 1 0: MINIMUM FREE AREA REQUIRED
FOR EACH OPENING (WHEN TWO OPENINGS
ARE USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
OUTSIDE THROUGH A H ORIZONTAL DUCT.
Total Input for
ALL Gas
Appliances
(BTUH)
Free Area for
Each Opening
when 2 Separate
Openings are
used (sq inches)
Round Pipe Duct
Diameter
(Horizontal Duct
Only) (inches)
50,000 25 6
75,000 38 8
100,000 50 8
125,000 63 10
150,000 75 10
TABLE 1 1: MINIMUM FREE AREA REQUIRED
FOR AN OPENING (WHEN O N E OPENING IS
USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
*
Total I nput for
ALL Gas
Appliances
(BTUH)
Free Area for an
Opening when 1
Opening is used
(sq inches)
Round Pipe Duct
Diameter (inches)
50,000 25 6
75,000 38 8
100,000 50 8
125,000 63 10
150,000 75 10
OUTSIDE.
TABLE 5: MINIMUM FREE AREA REQUIRED
FOR AN OPENING (WHEN ONE OPENING IS
USED) WITH A FURNACE:
1. LOCATED IN A CONFINED SPACE
2. USING OUTDOOR AIR FOR COMBUSTION
3. COMMUNICATING DIRECTLY TO THE
3. OUTSIDE.
COMBUSTION AIR REQUIREMENTS: CONFINED AND
UNCONFINED SPACES
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FIGURE 10
NON-DIRECT VENT
AIR FROM
HEATED
SPACE
VENT PENETRATIONS
for non direct vent furnaces
air from heated space

Rheem 801C Series Specifications

General

Brand	Rheem
Model	801C Series
Category	Furnace
Language	English