34
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
penetrate 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 pass-
es 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 suit-
able waterproof 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 recom-
mend that the chase be insulated
and where the vent pipe be
wrapped with an insulated
mylar sleeve. This will increase
the temperature of the vent and
help the appliance to vent prop-
erly in cold weather conditions.
It is also important in vertical
vented direct vent appliances
that the appliance be operated
daily during the winter months
as this will help stop the
Termination from freezing up.
We recommend using a thermo-
stat set at room temperature to
allow the unit to cycle.
