CHIMNEY AND VENTING
Chimney required for the GBU070 is 4” Class “L” (also known as PL vent). A
starting collar must be used to attach the venting system to the furnace. When
connecting into a Class “A” or masonry chimney an approved 4” liner MUST be
used to prevent back drafting of the chimney.
EXISTING CLASS “A” CHIMNEY:
Run 4” Class “L” connector from the furnace connection to a positive
connection with the class “A” chimney. AN APPROVED 4” LINER MUST
BE USED IN CLASS “A” CHIMNEYS. Make sure each joint is firmly
locked in place. Make sure the attachment of Class “L” to the Class “A”
chimney is secure with sheet metal screws. Seal all joints with high
temperature silicone. Class “L” connector should maintain a pitch on
rise from the furnace to the chimney of at least ¼” per foot.
A): “L” Vent connector 4” B): “L” Vent elbow 90° adj. 4”
EXISTING MASONRY CHIMNEY: Run 4” Class “L” connector from
the furnace connection to a positive connection with the masonry
chimney. Make sure each joint is firmly locked in place. Make sure
the penetration of the Class “L” connector into the masonry chimney
is sound and secured with high temperature cement. Seal all joints with
high temperature silicone. Class “L” connector should maintain a pitch
on rise from the furnace to the chimney of at least ¼” per foot.
AN APPROVED 4” LINER MUST BE USED IN MASONRY CHIMNEYS.
Your new furnace is so efficient; an unlined chimney could remain
cold and cause a downward pressure creating poor burning,
incomplete combustion or back draft.
A.)“L” Vent connector 4” B.)“L” Vent elbow 90° adj. 4”
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NEW VERTICAL INSTALLATIONS: Install 4” Class “L” chimney add
accessories according to manufacturers instructions and local codes
(3” clearance to combustibles). Run Class “L” chimney all the way from
the furnace connection to point of termination. Make sure each joint is
firmly locked in place. Seal all joints with high temperature silicone.
Class “L” connector should maintain a pitch on rise from the furnace to
the chimney of at least ¼” per foot.
A.) Vertical top 4” D.) Adj. flashing 4”
B.) “L” Vent pipe 4” E.) Fire stop spacer 4”
C.) Storm Collar 4” F.) “L” Vent 90° adj. 4” clean out tee
DIRECT VENT HORIZONTAL TERMINATION IS NOT RECOMMENDED
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