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Installing a Vent Near a Window Ledge,
Other Type of Projection or on Siding (vinyl, aluminum, etc.)
Direct vent furnaces are designed to be installed on a uniform out-
side wall. When the wind comes from any angle (up, down or from
either side), it must hit the vent cap equally over both the air inlet
and the flue outlet portions of the vent. Any wall projection, such
as a door or window casing, which disturbs the wind on one side of
the air inlet section will result in back pressure on the flue section
smothering the flame and eventual pilot outage.
When the vent cap is to be installed on siding or it appears that a
projection within 6" of any side of the air inlet section could shield
the air inlet section, the entire vent should be supported away from
the wall at least the distance of the projection. 2" x 4" framing whose
outside dimensions match the overall dimensions of the mounting
plate is recommended. The 2" x 4" framing protects siding from
possible warpage or discoloration. All joints can then be sealed and
painted. The wall depth plus the additional depth of the 2" x 4" fram-
ing should not exceed a total depth of 13" for DV-55. (See Figure 9)
Vinyl siding vent kit, DV-822, is available from Empire Comfort
Systems, Inc. The depth is 3", which enables the vent cap to be
extended away from siding or projections. The wall depth plus the
additional 3" depth of the vinyl siding vent cap extension should not
exceed a total depth of 13" for DV-55. (See Figure 10)
Warning: When vinyl siding vent kit, DV-822 or 2" x 4" fram-
ing is added to an existing installation (furnace is installed)
do not attempt to add sections of pipe to the flue outlet tube
or air inlet tube. An air tight seal is required for both tubes.
Refer to Parts List, page 16 to order tubes.
Figure 9
Figure 10
INSTALLATION INSTRUCTIONS (continued)
