Laars NTH1000, Installation And Operation Instructions Manual, Page: 13 / 140

NeoTherm LC Boilers and Water Heaters Page 9
shall be of the same cross-sectional area as the free
area of the openings to which they connect.
Method 1 : Two permanent openings, one
commencing within 12” (300 mm) of the top and
one commencing within 12” (300 mm) of the
bottom, of the enclosure shall be provided. The
openings shall communicate directly, or by ducts,
with the outdoors or spaces that freely communicate
with the outdoors. When directly communicating
with the outdoors, or when communicating to the
outdoors through vertical ducts, each opening shall
have a minimum free area of 1 square inch per
4000 Btu/hr (550 square mm/kW) of total input
rating of all equipment in the enclosure. When
communicating to the outdoors through horizontal
ducts, each opening shall have a minimum free
area of not less than 1 square inch per 2000 Btu/
hr (1100 square mm/kW) of total input rating of all
equipment in the enclosure.
Section 3
VENTING AND COMBUSTION AIR
3.1 Combustion Air
NeoTherm LC boilers and water heaters must
have provisions for combustion and ventilation
air in accordance with the applicable requirements
for Combustion Air Supply and Ventilation in the
National Fuel Gas Code, ANSI Z223 1; or in Canada,
the Natural Gas and Propane Installation Code, CSA
B149.1. All applicable provisions of local building
codes must also be adhered to.
A NeoTherm LC can take combustion air
from the space in which it is installed, or the
combustion air can be ducted directly to the unit.
Ventilation air must be provided in either case.
3.1.1 Combustion Air From Room
In the United States, the most common requirements
specify that the space shall communicate with the
outdoors in accordance with Method 1 or 2. (See the
following descriptions.) Where ducts are used, they
Table 3a - Horizontal Terminations for Indoor Use
PVC CPVC Stainless Steel Polypropylene
Model Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust
1,000 CA008100 CA008300 CA008100 CA008300 CA008200 D2004500 CA008500 CS008500
1,700 CA010700 CA010900 CA010700 CA010900 CA011000 CA011100 CA011000 CA011100
PVC CPVC Stainless Steel Polypropylene
Model Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust Ducted Air Exhaust
1,000 CA008400 CA008300 CA008400 CA008300 CA008500 CA008500 CA008500 CA008500
1,700 CA010800 CA010900 CA010700 CA010900 CA011300 CA011200 CA011200 CA011200
Table 3b - Vertical Terminations for Indoor Use
Table 3c - Outdoor Terminations
Model Ducted Air Exhaust
1,000 CA008700 CA008900
1,700 CA010400 CA011500
Table 4 - Required Combustion Air Pipe Material
Material United States Canada
ABS ANSI/ASTM D1527 The air pipe material must be chosen based upon
the intended application of the boiler, and must
be installed according to the vent manufacturer’s
installation instructions.
PVC, sch. 40 ANSI/ASTM D1785 or D2665
CPVC, sch. 40 ANSI/ASTM F441
Single wall galv. steel 26 gauge
Polypropylene ULC-S636 Class 2C