7
Notes
1.) If the horizontal distance between the inlet and exhaust is more then 12”, increase minimum
vertical separation by the same amount. (If horizontal distance is greater then 6’, no additional
vertical spacing is required). Example, horizontal separation equal to 24” requires a minimum
vertical separation of 18”+(24”-12”) =
30”
. (Vertical separation is never required to be greater
then 36”)
2.) Elbows on outside of wall must be no greater than ½” away from the wall.
3.) All indoor exhaust piping must be on a slope back to the boiler ¼” per linear foot of vent. (See
figure after #11. Recommended way to have plumb pipe connection to boiler.)
4.) Exhaust and Inlet venting must have screens installed at the termination (See figure page 7).
5.) Exhaust vent pipe can be secured to the wall for more rigidity.
6.) In all roof applications the discharge must point away
from the pitch of the roof.
7.) Install adequate flashing where the pipe enters the
roof, to prevent water leakage.
8.) Install and seal a rain cap over existing chimney
openings, in vacant chimney applications.
9.) For installations that exit the wall below grade.
Excavate site as shown in figure, to a point below
where the pipes are to exit. Ensure that the wall is
fully sealed where the pipes penetrate the wall. The
vent piping MUST be secured to the side of the
building above grade, as shown, to provide rigidity.
NTI Provides a mounting bracket PN. 82075 for
securing the exhaust pipes. Ensure that the vent clearances are maintained (Inlet minimum 12”
plus snow allowance from grade, exhaust outlet 18” minimum above inlet)
PN 82075
Must insert
plastic bird
screen
12” Min. Plus
Snow Allowance
30” Min. Plus
Snow Allowance
Apply plate here
Gas Vent Directly Below
Keep Free of Obstructions
