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ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
Table 9: Positive-Pressure (CAT III) Vent Termination Clearances
DIM
Clearance Descrip on
U.S. Installa on (1)
Candadian Installa on (2)
A
Clearance above grade, veranda, porch, deck, balcony,
or anticipated snow level
12 in. (305 mm)
12 in. (305 mm)
18 in. (457 mm) above roof surface
B
Clearance to a window or door that may be opened
12 in. (305 mm) for appliances
> 500,000 Btuh (15 kW)
36 in. (914 mm) for appliances
> 1,00,000 Btuh (30 kW)
C
Clearance to a permanently closed window
See note*
D
Vertical clearance to a ventilated soffit located above
the terminal within a horizontal distance of 2 ft (61 cm)
from teh centerline of the terminal.
E
Clearance to an unventilated soffit
F
Clearance to an outside corner
G
Clearance to an inside corner
H
Clearance to each side of the centerline extended
above electrical meter or gas service regulator assem-
bly
3 (0.9m) within 15 (4.6m) above the
meter/regulator assembly
3 (0.9m) within 15 (4.6m) above
the meter/regulator assembly
See note*
I
Clearance to service regulator vent outlet
See note*
3 (0.9m)
J
Clearance to non-mechanical air supply inlet to building
or the combustion air inlet to any other appliance
9 in. (229mm) for appliances > 10,000 Btuh
(3kW) and <= 50,000 Btuh (15kW), 12 in.
(305mm) for appliances > 50,000 Btuh (15
kW)
12 in (305mm) for appliances > 10,000 Btuh
(3kW) and <= 100,000 Btuh (30 kW), 36 in.
(914mm) for appliances > 100,000 Btuh
(30kW)
K
Clearance to a mechanical air supply inlet
3 ft (0.9m)
6 ft. (1.8m)
L
Clearance above paved sidewalk or paved driveway
located on public property
See note*
7 ft. (2.1m). A vent shall not terminate above
a sidewalk or paved driveway that is located
between two single family dwellings and
serves both dwellings.
M
Clearance under a veranda, porch, deck, or balcony
See note*
12 in. (305mm). Permitted only if veranda,
porch, deck, or balcony is fully open on a
minimum of two sides beneath the floor.
N
Clearance from a plumbing vent stack
3 . (0.9m)
3 ft. (0.9m)
(1) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
(2) In accordance with the current CAN/CSA B149.1, Natural Gas and Propane Installation Code
*
For clearances not specified in ANSI Z223.1 / NFPA 54 or CAN/CSA B149.1, clearances shall be in accordance with local installation codes and the
requirements of the gas supplier