Hayward 150 - Page 16

16 USE ONLY GENUINE REPLACEMENT PARTS
51300004201B
Table6 Negative-Pressure (CATI) Indoor Vent Kits with Vent Pipe & Terminal Specifications
Models
Indoor Vent Kit
Part Number
Vent
Dia(in)
Description
Vent Pipe
Application
Vent Pipe
Material
Vent
Termination
Requirement
150
UHXNEGVT11506
6
Indoor Vent
Adapter Kit,
Negative
Pressure
CATI, Vertical
Venting
Applications
Vent pipe to be
installed according to
the venting Tables in
the National Fuel
Gas Code (ANSI
Z223.1/NFPA 54) for
a Category I gas
appliance
Single or
Double Wall,
Galvanized,
Non-Sealed
Vent Pipe
Vertical
Only
200
UHXNEGVT12006
6
250
UHXNEGVT12506
6
300
UHXNEGVT13008
8
350
UHXNEGVT13508
8
400
UHXNEGVT14008
8
500
UHXNEGVT15008
8
CATI MECHANICAL DRAFT SYSTEMS: Vent systems requiring power venting must use mechanical draft systems listed in
accordance with UL378 Draft Equipment. Selection of power venter and required clearances from combustible materials must
follow draft equipment manufacture’s instructions, National Fuel Gas Code, local codes and the information in this manual.
NEGATIVE PRESSURE CATI VENT TERMINATION: Any vent extending through a roof or wall must be listed double-wall (Type B)
vent, and pass through an approved roof jack, or roof thimble. A listed vent cap must be used. Terminations for Gas vents with
listed 12in or less diameter size and located not less than 8ft from a vertical wall or similar building feature shall terminate per
Figure11 and Table7 using the roof pitch to find the minimum termination height value of H. Terminations for Gas vents with listed
12in or less diameter size located less than 8ft from a vertical wall or similar building feature shall terminate not less than 2ft above
the highest point where they pass through the roof and not less than 2ft above any portion of a building within 10ft horizontally
Figure11: Minimum Height from Roof
for Vent Cap
Table7 Height Requirements for Negative
Pressure (CATI) Vent Caps (see Figure11)
Roof Slope
Min. Height H from Roof to
Lowest Discharge Opening
(ft.)
(m)
Flat to 6/12
1.0
0.30
Over 6/12 to 7/12
1.25
0.38
Over 7/12 to 8/12
1.5
0.46
Over 8/12 to 9/12
2.0
0.61
Over 9/12 to 10/12
2.5
0.76
Over 10/12 to 11/12
3.25
0.99
Over 11/12 to 12/12
4.0
1.22
Over 12/12 to 14/12
5.0
1.52
Over 14/12 to 16/12
6.0
1.83
Over 16/12 to 18/12
7.0
2.13
Over 18/12 to 20/12
7.5
2.27
Over 20/12 to 21/12
8.0
2.44
Listed
Cap
Lowest Discharge
Min. Height (H) from Roof to
Lowest Discharge Opening
Roof Slope at X/12