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!
Do not vent a gas-fired boiler through a side
wall. Gas-fired boilers may only be vented
into a chimney (Category I).
Consult with local authorities to ensure
compliance with all building, plumbing, and
electrical codes.
The optional DES is to be used in conjunction with the
boiler for indoor installations requiring through-the-wall
venting. The DES is designed as an integral part of the
boiler, eliminating the need for a power venter.
Boiler
3 sections
FDVS 4
4 to 9 sections
FDVS 6
Oil boiler DES kits include an oil burner with adjustable
post purge timer and solenoid valve. For through-the-wall
venting, the post purge burner must be used in place of
the standard burner that is furnished with the boiler.
FIG. 4 – TYPICAL DIRECT EXHAUST INSTALLATION (W/BECKETT AFG OIL BURNER)
INDOOR DIRECT EXHAUST BOILERS
— FOR OIL-FIRED BOILERS ONLY!! —
!
WARNING
Kit
Duct Dia.
4"
6"
NOTE: Use standard single wall galvanized metal vent pipe for
the vent and air intake piping. A B-Vent shall not be used in the
vent system.
The exhaust terminal included in the FDVS kit is a
model FDVS stainless steel vent hood. Located on
an exterior wall of the building, the exhaust terminal
is one of the most important elements of a direct-vent
installation. Planning the location of the terminal is the
first step. See Figures #4 and #5.
The model FDVS vent hood is designed for use on
combustible walls up to 8" thick. For combustible walls
over 8" thick, consult the boiler manufacturer. The
FDVS vent hood may be used on non-combustible
Wall
walls of any thickness.
Opening
6½"
IMPORTANT: The FDVS side-wall vent hood re-
quires a ½" clearance to combustibles for flue gas
8½"
temperatures of 450°F or lower and a 1" clearance
for temperatures between 450° and 550°F. For flue
gas temperatures in excess of 550°F, use of a power
venter with the vent hood is recommended.
8
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