Empire Comfort Systems MILLIVOLT DVCD FP3-4 Series Installation Instructions Manual page 21

Example of possible venting systems using two 90° elbows.
V is listed as minimum vertical dimensions and H1 + H2 is listed
as total of maximum horizontal dimensions. The maximum
vertical and horizontal distances for two 90° elbows as shown in
Figure 33 is 20 feet (6.1 m).
Attention: Refer to Figure 30 for additional venting requirements.
H1
FIRESTOP AT
CEILING LEVEL
SEE GRAPH FOR PERMISSIBLE "H" AND "V" DIMENSIONS
NOTE: H1 AND H2 MUST BE ADDED TOGETHER TO USE CHART
38712-4-0920
VENTING FIREPLACE - TOP (CONT'D)
H2
V
Figure 33
HARD ELBOW Dimensions (inches)
FIREPLACE
SERIES
A
DVCD32FP 41-1/2
DVCD36FP 41-1/2
DVCD42FP 43-1/2
FLEX PIPE 90 DEGREE BEND
FIREPLACE
SERIES
A
DVCD32FP 43
DVCD36FP 43
DVCD42FP 45
Minimum hole location dimensions for through the wall horizontal
installations with 90 degree elbow off top of fireplace.
D
C
B
C
B
A
CENTER OF ELBOW
STRAIGHT OUT
(MINIMUM)
B C
4-1/2 6-1/2
4-1/2 6-1/2
4-1/2 6-1/2
Dimensions (inches)
B C
4-1/2 6-1/2
4-1/2 6-1/2
4-1/2 6-1/2
Figure 34
D
9-1/8
9 1/8
9 1/8
D
9-1/8
9-1/8
9-1/8
Page 21