Using Flex Bends
4. Avoid cutting joists by offsetting the flex pipe. See Fig. 2.
5. When using 45° bends a bend support is required directly above the
highest bend.
6. When installing a bend in a joist area a minimum of 2 1/2” clearance
to combustible to the top of bend must be maintained, sides and bot-
tom of pipe, a 1” clearance to combustibles must be maintained. If
running horizontal through an area a 1 1/2” minimum clearance to
the top of the horizontal pipe must be maintained.
7. Maximum vertical height of system should not exceed 40 feet.
8. Use roof support and 7” rigid pipe at roof level. Flex not permitted
within roof support.
9. When penetrating the roof a rigid 7” galvanized pipe must be used.
Attach the 7” flex to the 7” rigid with high temperature sealant, secure
with four screws assuring the flex and rigid pipe are secured. 4” flex
pipe must be secured the same way with 4 screws but must pene-
trate the 4” flex and 4” section of termination. Attach 7” rigid pipe to
7” termination with sealant and screw with 4 sheet metal screws.
(See Fig. 3).
10. Vertical termination clearance is 18” (inches) above the roof, mea-
sured from highest point of exit on the roof line.
11. Support vertical pipes to maintain minimum of one inch or greater
clearances to combustibles.
Venting Straight Up Through Roof
1. An Attic Insulation Shield must be installed where the vent passes
from a lower living space into an attic space where the chimney is
not enclosed. It is designed to keep insulation materials away from
the chimney. See Fig. 1.
2. When installing the Attic Insulation Shield where the chimney passes
from a living space to an attic space, install the shield from below
and nail in place using 1” spiral nails.
3. A fire stop must be installed on the bottom side of the joists when
passing through a ceiling or floor. If an attic insulation shield is to be
used, a fire stop is not required.
Roof Flashing
Ensure that you have the proper roof flashing by checking your
roof pitch using a level and two rulers, or by using a roof pitch card.
See figure below.
Slide a Roof Flashing suitable to your roof slope over the vent.
Place the edge of the flashing plate that will be on the higher part
of the roof slope under the shingles. Both the sides and the lower
edge lay on top of the shingles.
NOTE: At the top edge of the flashing plate, lift the shingles
and nail the plate to the roof deck, then cement the shingles
to the plate with a suitable waterproof mastic.
Ensure that the chimney is plumb. Square up the flashing plate and
nail in place to the roof deck. Use 12 nails with neoprene washers
or cover the heads with a suitable waterproof mastic.
Wrap the storm collar around the vent above the flashing. Secure
the ends together loosely with nut and bolt supplied. Slide the col-
lar down the vent until it comes in contact with the flashing. Tighten
the bolt and seal the Storm Collar to the vent with a suitable water-
proof non-combustible mastic.
The flashing and storm collar should be painted to match the roof
shingles. This will extend its life and improve the appearance.
Clean, prime and paint with suitable painting products.
Vertical Venting in Cold Climates
In cold climate conditions where
temperatures go below -10 degrees
Celsius or 14 degrees Fahrenheit,
we recommend that the chase be
insulated and where the vent pipe
enters into the attic space that the
pipe be wrapped with an insulated
mylar sleeve. This will increase the
temperature of the vent and help the
appliance to vent properly in cold
weather conditions.
It is also important in vertical vented
direct vent appliances that the appli-
ance be operated daily during the
winter months as this will help stop
the Termination from freezing up. We
recommend using a thermostat set
at room temperature to allow the
unit to cycle.
For IPI models it may be necessary
to set the appliance to Standing Pilot
mode to maintain heat in the cavity.
The purpose of this procedure is to
prevent cold air from penetrating the
chimney and then onto the living
space. Therefore, when the internal
temperature is slightly elevated the
fireplace is able to freely exhaust its
combustion and hence making it
easier to startup
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