10002789/0 -15- DBT33/DBT36/DBT39
DO NOT BACK FILL AROUND SNORKEL.
A CLEARANCE OF AT LEAST 4” MUST BE
MAINTAINED BETWEEN THE SNORKEL AND
THE SOIL
If the foundation is recessed, use recess brackets (not supplied)
for securing lower portion of the snorkel. Fasten brackets to
wall rst and then secure to snorkel with self-drilling #8 x 1/2
sheet metal screws. It will be necessary to extend the vent
pipes out as far as the protruding wall face (Fig. 29).
VERTICAL THROUGH-THE-ROOFAPPLICATIONS.
This Gas Fireplace has been approved for,
• Vertical installations up to 40' (12 m) in height. Up to
a 10' horizontal vent run can be installed within the vent
system using a maximum of two 90º elbows. (Fig. 30)
• Up to two 45º elbows may be used within the horizontal
run. For each 45º elbow used on the horizontal level the
maximum horizontal length must be reduced by 18".
Example: Maximum horizontal length
0 x 45º elbows = 10'
1 x 45º elbow = 8.5'
2 x 45º elbows = 7'
• A minimum of an 8' vertical rise.
• Two sets of 45º elbow offsets within these vertical instal-
lations. From 0 to a maximum of 8' of vent pipe can be
used between elbows. (Fig. 31)
Fig. 28
Fig. 29
Fig. 30