York DFAH - Manual (Page 21)

107272-UIM-B-1105
Unitary Products Group 21
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor. For clearance not specified in UL 311 Standard for
Safety for Roof Jacks for Manufactured Homes and Recreational Vehicles.
Clearance in accordance with local installation codes and the Manufacturer’s Installation Manual.
Any fresh air or make up inlet for dryer or furnace area is considered to be forced air inlet.
Avoid areas where condensate drippage may cause problems such as above planters, patios, or adjacent to windows where steam may cause fogging.
A terminus of a vent shall be either:
Fitted with a cap in accordance with the vent manufacturer’s installation instructions, or In accordance with the installation instructions for a special venting system.
* Does not apply to multiple installations of this furnace model. Refer to "VENTING MULTIPLE UNITS" in this section of these instructions.
IMPORTANT: Consideration must be given for degradation of building materials by flue gases. Sidewall termination may require sealing or shielding of building surfaces
with a corrosion resistant material to protect against combustion product corrosion. Consideration must be given to wind direction in order to prevent flue
products and/or condensate from being blown against the building surfaces. If a metal shield is used it must be a stainless steel material at a minimum
dimension of 20” (50.8 cm). It is recommended that a retaining type collar be used that is attached to the building surface to prevent movement of the vent
pipe.
Responsibility for the provision of proper adequate venting and air supply for application shall rest with the installer.
Vent shall extend high enough above building, or a neighboring obstruction, so that wind from any direction will not create a positive pressure in the vicinity of the vent.
Also in accordance with the current UL 727 Standard for safety for oil-fired central furnaces.
FIGURE 34: Home Layout
L
E
D
B
V
V V
X
V
B
V
J
X
B
B
B
V
V
F
V
C
B
X
V
I
V
G
H
A
M
K
Operable
Fixed
Closed
Vent Terminal
Air Supply
Area Where Terminal is Not Permitted
Fixed
Closed
Inside Corner Detail
Canadian Installations 1 US Installation 2
A.Clearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm) 12 inches (30 cm)
B.Clearance to window or door that may be opened
12 inches (30 cm) for models <100,000 BTUH
(30 kW), 36 inches (91 cm) for models > 100,000
BTUH (30 kW)
4 Feet
C.Clearance to permanently closed window 4 Feet 4 Feet
D.Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance
of 2 feet (61 cm) from the center line of the terminal 4 Feet 4 Feet
E.Clearance to unventilated soffit 12 Inches 12 Inches
F. Clearance to outside corner 12 Inches 12 Inches
G.Clearance to inside corner 6 Feet 6 Feet
H.Clearance to each side of center line extended
above meter/regulator assembly
3 feet (91 cm) within a height 15 feet (4.5 m)
above the
meter/regulator assembly
3 feet (91 cm) within a height 15 feet (4.5 m)
above the meter/regulator assembly
I. Clearance to service regulator vent outlet 3 feet (91 cm) 3 feet (91 cm)
J. Clearance to nonmechanical air supply inlet to building
or the combustion air inlet to any other appliance
12 inches (30 cm) for models <100,000 BTUH
(30 kW), 35 inches (91 cm) for models >100,000
BTUH (30 kW)
4 Feet
K.Clearance to a mechanical supply inlet 6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet (3 cm)
horizontally
L. Clearance above paved sidewalk or paved driveway located on
public property
7 feet (2.13 m) † 7 feet (2.13 m) †
M.Clearance under veranda, porch, deck, or balcony 12 inches (30.4 cm) 12 inches (30.4 cm)
Vent Termination from any Building Surface 12" (30.4 cm) 12" (30.4 cm)
Above anticipated snow depth 12" (30.4 cm) 12" (30.4 cm)
1. In accordance with the current CSA B149.1-00, Natural Gas and Propane Installation Code.
2. In accordance with the current ANSI Z223.1 / NFPA 54, National Gas Code. In accordance with the current UL 311 Standard for Safety for Roof Jacks for Manufac-
tured Homes and Recreational Vehicles.