Harsco Industrial P-K THERMIFIC N700 Installation & Owners Manual page 18

Be sure that the damper is mounted horizontally (never vertically). Be sure to remove all three red stops
from the damper before start-up. The damper door should swing freely. Carefully follow all the
instructions provided with the barometric damper.
monoxide, the opening in the damper (draft control gate) must never face against the flow of flue gas.
3.5.3.4 Horizontal to Vertical Transitions
The turn from horizontal to vertical should be made with two 45º ells, a long radius 90º ell, or a 135° boot
tee. Do not use "short radius" ells.
3.5.3.5 Vent Termination
The vent may be terminated with either no cap or a low-loss (non-restrictive) cap of adequate capacity.
The cap must be approved by the vent manufacturer for use with their product.
Correct Listed
Termination
3.5.3.6 Required Clearances
The vent must extend at least three (3) feet above the roof, or at least two (2) feet above the highest part
of any structure within ten (10) feet of the vent (see diagram below):
To avoid spillage into the boiler room of dangerous flue gas containing carbon
Incorrect
Termination
(too restrictive)
P-K THERMIFIC
Reference: NFPA 54/ANSI Z223.1
National Fuel Gas Code
18
®
Gas-Fired Boiler