Harman Stove Company HB 38 DV Installation And Operating Manual page 22

Only For Qualified Installers
Use Adaptor (Part No. 1222D )
to reduce to 6
VENTING
Venting with 6
Maximum of four 45
Subtract three feet of total horizontal pipe
length for the 3rd and 4th 45
Maximum of two 90
Subtract five feet of total horizontal pipe
length for second elbow.
A combination of one 90
elbows is allowed.
Subtract three feet of total horizontal pipe
length for each 45
air intake termination clearances above the high side
of an angled roof are as follows:
5
/ x 4 vent pipe.
8
22
" x 4" Pipe
5
/
8
0
elbows allowed.
0
elbow used.
0 elbows allowed.
0
elbow and two 45
0 elbow used.
Vent termination m ust remain
within the shaded area regardless of
configuration.
For the Serenity Direct Vent Fireplace, the vent/
Roof Pitch
Flat to 6/12
7/12 to 9/12
10/12 to 12/124
13/12 to 16/126
17/12 to 21/128
0
Feet Meters
1 0.3
2 0.6
1.2
1.8
2.4