Combustion & Ventilation Air Requirements - Bosch BGH96M060B3B Installation Instructions Manual

VENT
COMBUSTION AIR
Figure 28 Double Horizontal Combustion Air Intake and Vent Termination
Figure 29
Double Vertical Combustion Air Intake and Vent Termination
8.6 Combustion & Ventilation Air Requirements
8.6.1 Combustion Air Supply
All installations must comply with Section 5.3, Air for Combustion and Ventilation
of the National Fuel Gas Code, ANSI Z223.1 or Sections 7.2, 7.3 or 7.4 of CAN/
CGA B149.1 or .2 Installation Code - latest editions.
This furnace is certified to be installed with one of three possible combustion air
intake configurations.
1. Outdoor Combustion Air:
This is a direct vent configuration where the combustion air is supplied through
a PVC , CPVC or ABS pipe that is connected to the PVC coupling attached to
the furnace and is terminated in the same atmospheric zone as the vent. This
type of installation is approved on all models. Refer to Figure 30.
2. Ambient Combustion Air:
Combustion air is supplied from the area surrounding the furnace through
openings in the furnace cabinet. The combustion air and the vent pipes are
not terminated in the same atmospheric zone. Refer to Figure 25 for vent
terminations. Refer to Section "Ambient Combustion Air Supply" for proper
installation. Refer to Figure 31 and 32.
3. Ventilated Combustion Air:
Combustion air is supplied through a PVC , CPVC or ABS pipe that is
connected to the PVC coupling attached to the burner box and is terminated
in a ventilated attic or crawl space. The combustion air and the vent pipes are
not terminated in the same atmospheric zone. Refer to Figure 32 for attic and
crawl space termination. Only the combustion air intake may terminate in the
attic. The vent must terminate outside.
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
2"
MIN.
MIN.
6"
Exhaust
8.6.2 Outdoor Combustion Air
Combustion Air Intake/Vent Connections
This installation requires combustion air to be brought in from outdoors. This
requires a properly sized pipe (shown in Figure 30) that will bring air in from the
outdoors to the furnace combustion air intake collar on the burner box. The second
pipe (Shown in Figure 30) is the furnace vent pipe.
Air Intake
Figure 30
Direct Vent Air Intake Connection and Vent Connection
The combustion air intake pipe should be located either through the wall
(horizontal or side vent) or through the roof (vertical vent). Care should be taken to
locate side vented systems where trees or shrubs will not block or restrict supply air
from entering the terminal. Also, the terminal assembly should be located as far as
possible from a swimming pool or a location where swimming pool chemicals might
be stored. Be sure the terminal assembly follows the outdoor clearances listed in
Table 10.
8.6.3 Ambient Combustion Air
This type of installation will draw the air required for combustion from within the
space surrounding the appliance and from areas or rooms adjacent to the space
surrounding the appliance. This may be from within the space in a non-confined
location or it may be brought into the furnace area from outdoors through
permanent openings or ducts. It is not piped directly into the furnace. A single,
properly sized pipe from the furnace vent connector to the outdoors must be field
supplied.
WARNING: CARBON MONOXIDE POISONING HAZARD
It is recommended that the supplied intake coupling
f
and 18" of pipe be attached to the furnace to prevent
accidental blockage of the combustion air intake.
COMBUSTION AIR
Figure 31 Combustion Airflow Path Through The Furnace Cabinet
Installation Instructions
Exhaust
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