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GUIDELINES FOR EXHAUST VENTING SYSTEMS DESIGN, CONT……
CHIMNEY AND VENTING
Chimney required for the Magnum 7500 Corn Furnace is 3 or 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 3 or 4" liner MUST be used to prevent back drafting of the chimney.
EXISTING CLASS "A" CHIMNEY:
Run 3” or 4” Class "L" venting from the furnace connection to a positive
connection with the class "A" chimney. AN APPROVED 3” or 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" venting should maintain a pitch on rise from the furnace to the chimney
of at least 1/4" per foot. .
A): "L" Vent venting 3”or 4" B): "L" Vent elbow 90°, adj. 3” or 4" or Tee
EXISTING MASONRY CHIMNEY:
Run 3”or 4" Class "L" venting 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" venting into the masonry chimney
is sound and secured with high- temperature cement. Seal all joints with high-
temperature silicone. Class "L" venting should maintain a pitch on rise
from the furnace to the chimney of at least 1/4" per foot.
AN APPROVED 3”or 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 venting 3”or 4" B.)"L" Vent elbow, 90° adj. 3”or 4" or Tee
NEW VERTICAL INSTALLATIONS
: Install 3”or 4" Class "L" venting and
accessories according to manufacturers instructions and local codes
(3" clearance to combustibles). Run Class "L" venting 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" venting should maintain a pitch on rise from the furnace to
the chimney of at least 1/4" per foot.
A.) Vertical top 3” or 4" D.) Adj. flashing 3”or 4"
B.) "L" Vent pipe 3”or 4" E.) Fire stop spacer 3”or 4"
C.) Storm Collar 3”or 4" F.) "L" Vent 90° adj.3”or 4" clean out tee
HORIZONTAL/VERTICAL
VENTING:
If venting
the
Magnum 7500
Horizontally through an exterior wall,
a vertical
section needs to be
installed to
provide natural draft in the event of power failure.
Use only 3”or 4" Class
"L" venting 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 temp silicone. Max. horizontal run length - 4ft.;
Min.
vertical length - 5 ft.
A.) "L" Vent pipe 3”or 4" B.) Wall thimble 3”or 4" C.) "L" vent 3” or 4" cleanout "T"
D.) "L" Vent pipe 5ft E.) Wall Bracket F.) "L" vent 90° elbow ."
G
.) "L" vent Termination collar 3” or 4”
If installing the venting on the exterior of the home or shop, the venting must
be enclosed in an insulated chase to prevent condensation and creosoting.
DIRECT VENT HORIZONTAL TERMINATION IS NOT RECOMMENDED
