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Air Inlet
Max. Length
Model
No.
Certified
Venting
Material
Vent Size
Maximum
Equivalent
Vent Length*
Combustion
Air
Intake Pipe
Material
6” 8”
302B 5”
402B
100’ N/A
502B
6”
75’
652B
752B
40’
100’
902B
Category III
8”
70’
Room Air
40’
Ducted
Combustion
Air
Galvanized
Steel,
PVC,
ABS,
CPVC
30’ 80’
Table O: Category III Horizontal and Direct Venting
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6I:<DGN$$$<6H7JGC>C<=:6I:GHHJ8=6HI=:'
HI6>CA:HH HI::A K:CIH D;;:G:9 7N #:6I !67 $C8 
 +GDI:8= .NHI:B $C8 
5!A:M  DG B:G>86C (:I6A +GD9J8IH
+>E:?D>CIHBJHI7:EDH>I>K:ANH:6A:9
!DAADLI=:K:CIB6CJ;68IJG:GYH>CHI6AA6I>DC>CHIGJ8I>DCH
86G:;JAAN
Direct Vent - Horizontal Through-
the-Wall
Installation
/=:H:>CHI6AA6I>DCHJI>A>O:I=:=:6I:GBDJCI:97ADL:G
ID9G6L8DB7JHI>DC6>G;GDBDJI9DDGH6C9K:CI8DB
7JHI>DCEGD9J8IHIDI=:DJI9DDGH
Note: When vertical height exceeds 25 ft,
consult factory prior to installation.
Fig. 26: Direct Vent - Horizontal Through-the-Wall
/=: IDI6A A:C<I= D; I=: I=GDJ<=I=:L6AA ;AJ: 86CCDI
:M8::9  :FJ>K6A:CI ;I >C A:C<I= ;DG I=: ;AJ: DJIA:I
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L>AA 6AADL >CHI6AA6I>DC >C DC: D; I=: I=G:: ;DAADL>C<
6GG6C<:B:CIH
Q YD;HIG6><=I;AJ:E>E:
Q YD;HIG6><=I;AJ:E>E:6C9DC::A7DL
Q YD;HIG6><=I;AJ:E>E:6C9ILD:A7DLH
/=:IDI6AA:C<I=D;6>GHJEEANE>E:86CCDI:M8::9I=:
9>HI6C8:HA>HI:9>C/67A:* 68=:A7DLJH:9>H:FJ6A
ID;ID;HIG6><=I E>E:/=>HL>AA6AADL>CHI6AA6I>DC>C
6CN 6GG6C<:B:CI I=6I 9D:H CDI :M8::9 I=: A:C<I=H
H=DLC>C/67A:*
/=:;AJ:9>G:8IK:CI86E>HCDI8DCH>9:G:9>CI=:DK:G
6AAA:C<I=D;I=:K:CI>C<HNHI:B
6G:BJHI7:I6@:C9JG>C<6HH:B7ANI=6I6AA?D>CIH6G:
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/=:K:CIBJHI7:>CHI6AA:9IDEG:K:CII=:EDI:CI>6A68
8JBJA6I>DC D; 8DC9:CH6I: >C I=: K:CI E>E:H $I >H
G:FJ>G:9I=6I
 /=:K:CIBJHI7:>CHI6AA:9L>I=6HA><=I9DLCL6G9
HADE:D;CDIBDG: I=6C>C8= E:G;DDI D;=DG>
ODCI6AGJCIDI=:K:CII:GB>C6A
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I=:=DG>ODCI6AGJC
.J7IG68I;IE:G:A7DL(6M:A7DLH
(6M>BJB8DB7JHI>DC6>G9J8IA:C<I=I:GB>C6I:96I:FJ>K6A:CI;I