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3. Installation of Air Intake System - Start assembly of the PVC air intake system at the boiler. Assembly of the air intake
system is done in the same manner as the vent system except as follows:
a. Drilla7/32”clearanceholeintothefrontsideoftheairintakeadapter.InserttherstpieceofPVCairintakepipe
into the air intake connection and drill a 1/8” tap hole into the PVC which lines up with the 7/32” clearance hole and
secure them together with a #10 x 1” sheet metal screw. Seal the joint between the intake pipe and the adaptor with
RT V.
b. All intake piping may be PVC.
c. There is a 0” minimum clearance between the air intake piping and all types of construction.
d. To the extent possible, pitch horizontal air intake piping towards the outside.
4. Installation of Horizontal Fitting Terminals (Terminal Option A):
a. See Figure 7.45 for proper orientation of twin pipe horizontal terminals. Outer edge of end pipe must be 10” or less
from the wall surface. (Figure 7.5)
b. Use plain end UV stabilized Centrotherm 2” pipe # ISEP02 or ISEP0239 or 3” pipe # ISEP03 or ISEP0339 and
insert Centrotherm Bird Screen #IASPP02 or #IASPP03 in the end of the pipe.
c. Add PVC intake per instructions from Part VII-F.
5. Installation of Vertical Fitting Terminals (Terminal Option H):
a. See Figure 7.46 for the proper orientation of twin pipe vertical terminals.
b. Use plain end UV stabilized Centrotherm 2” pipe # ISEP02 or ISEP0239 or 3” pipe # ISEP03 or ISEP0339 and
insert Centrotherm Bird Screen #IASPP02 or #IASPP03 in the end of the pipe.
c. A 180° bend (or two 90° elbows) are installed on the top of the air intake pipe. If two 90° elbows are used, the
rodent screen provided can be installed between them (Figure 7.46). If a 180° bend is used, install the rodent screen
intheopensideofthebend,usingaringmadeofPVCpipe.Ifdesired,theterminationttingscanbeattachedtothe
endoftheintakepipeswitheldsuppliedstainlesssteelscrewssothattheycanbelaterremovedforcleaningand
inspection.Ifthisisdone,drillaclearanceholeinthesettingsandatapholeintheendoftheintakepipestoaccept
these screws.
d. Useroofashingsandstormcollarstopreventmoisturefromenteringthebuilding.Sealtheroofashingtotheroof
using generally accepted practice for the type of roof on the installation. Apply RTV to seal the storm collars to the
vent and intake pipes.
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