20
2
General venting
Installation & Service Manual
FLUE OUTLET
AIR INLETS
AIR INLETS
3’ MIN
3’ MIN
Figure 2-14 Installation of Multiple Direct Vent Caps
Multiple Sidewall Direct Vent Installations
The combustion air inlet caps for multiple appliance
installations must maintain the minimum 3 foot (91 cm)
radius clearance below or horizontally from the closest
flue outlet. Multiple flue outlet caps may be installed side
by side and multiple air inlet caps may be installed side
by side but the 3 foot (91 cm) radius minimum clearance
between air inlet and flue outlet must be maintained. All
clearance and installation requirements in this section and
the applicable portions of the general venting section must
be maintained on multiple appliance installations.
CAUTION
Appliances which are shut down or will
not operate may experience freezing
due to convective air flow in the air
inlet pipe connected to the unit. Proper
freeze protection must be provided, see
Freeze Protection.
2’
12’
Figure 2-15 Vertical Direct Vent Installation
A Direct Vent System with Vertical Through
the Roof Terminations
Follow all requirements in the General Venting section for
venting flue products to the outdoors and general installation
instructions. All direct vent appliances must have combustion
air supplied directly to the appliance with a separate air pipe.
The bell increaser, installed on the vent outlet, must be
removed. The bell increaser is
NOT USED
with the direct
vent system. Vent connection is made directly to the top of
the appliance. No additional bell increaser, draft diverter or
barometric damper is required. The direct vent system uses
a two pipe system, one pipe for the flue products and one
pipe for the combustion air supply. The vertical through-roof
vented flue
MUST
be a dedicated stack. The flue can
NOT
be combined with any other appliance vent or common vent
from multiple appliances. The vent on a direct vent system
may have a positive pressure in the flue which requires all
vent joints and seams to be sealed gas-tight. The direct
vent vertical through-roof venting system has specific vent
material and installation requirements. The flue from
a direct vent system must have a condensate drain with
provisions to properly collect and dispose of any condensate
that may occur in the venting system. Choose acceptable vent
materials from those listed below.
The combustion air inlet pipe must also be a dedicated system
with one air inlet pipe per appliance. The air inlet pipes
from multiple appliances can
NOT
be combined to a single
common connection. The air inlet pipe connects directly to
the appliance to supply combustion air.
The air inlet pipe must be sealed. Choose acceptable
combustion air pipe materials from those specified in this
section.
Summary of Contents for Efficiency-Pac EW 150 -- 300
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