Thermal Solutions APEX APX425C Installation, Operating And Service Instructions page 15

4
Venting
(continued)
b. Maintain minimum clearance to combustible
materials. See Table 3-2 for details.
c. Enclose vent passing through occupied
or unoccupied spaces above boiler with
material having a fire resistance rating at
Table 4-1: Vent/Combustion Air Intake System Options
Vent & Intake
Materials
Standard CPVC/PVC Two-Pipe,
CPVC/PVC
Vent and PVC Air Intake
Optional Polypropylene
Two-pipe, Rigid PP
Vent or Flexible PP
Vent (Vertical Only) and Rigid PP
or PVC Air Intake
Optional Stainless Steel
Two-pipe, SS Vent and
Galvanized Steel or PVC
Air Intake
106308-05 - 3/23
Penetration
Option Through
Structure
Intake Horizontal Sidewall
1
Vent Horizontal Sidewall
Intake Horizontal Sidewall
2
Vent Horizontal Sidewall
Intake Horizontal Sidewall
3
Vent Vertical Roof
Intake Vertical Roof
4
Vent Vertical Roof
Intake
5
Vent Horizontal Sidewall
Intake
6
Vent Vertical Roof
Intake Horizontal Sidewall
7
Vent Horizontal Sidewall
Intake Horizontal Sidewall
8
Vent Horizontal Sidewall
Intake Horizontal Sidewall
9
Vent Vertical Roof
Intake Vertical Roof
10
Vent Vertical Roof
Intake
11
Vent Horizontal Sidewall
Intake
12
Vent Vertical Roof
Intake Horizontal Sidewall
13
Vent Horizontal Sidewall
Intake Horizontal Sidewall
14
Vent Vertical Roof
Intake Vertical Roof
15
Vent Vertical Roof
Intake
16
Vent Horizontal Sidewall
Intake
17
Vent Vertical Roof
APEX Installation, Operating, & Service Instructions
least equal to the rating of adjoining floor or
ceiling.
Note: For one or two family dwellings, fire
resistance rating requirement may not need
to be met, but is recommended.
d. Slope horizontal vent pipe minimum 1/4 in/ft.
(21 mm/m) downward towards the boiler.
Termination
90° Elbow w/ Screen
Coupling w/ Screen
Ipex Low Profile
90° Elbow w/ Screen
Coupling w/ Screen
(2) 90° Elbows w/ Screen
Coupling w/ Screen
N/A - Room Air
90° Elbow or Tee w/ Screen
N/A - Room Air
Coupling w/ Screen
UV Resistant 90° Elbow
w/Screen
UV Resistant Straight Pipe
w/Screen
Ipex Low Profile
UV Resistant 90° Elbow
w/Screen
UV Resistant Straight Pipe
w/Screen
(2) UV Resistant 90° Elbows
w/Screen
UV Resistant Straight Pipe
w/Screen
N/A - Room Air
UV Resistant 90° Elbow
w/Screen
N/A - Room Air
UV Resistant Straight Pipe
w/Screen
90° Elbow w/Screen
Straight Termination
w/Screen
90° Elbow w/Screen
Straight Termination
w/Screen
(2) 90° Elbows w/Screen
Straight Termination
w/Screen
N/A - Room Air
90° Elbow or Tee w/Screen
N/A - Room Air
90° Elbow or Tee w/Screen
Component
Figures
Table
4-6, 4-7 4-11, 4-12
4-8 4-13
4-6, 4-7, 4-9 not provided
4-9 4-14
4-6, 4-7 not provided
4-9 not provided
4-6, 4-7 4-22, 4-23, 4-24
4-13, 4-22, 4-23,
4-8
4-24
4-6, 4-7, 4-9 4-22, 4-23, 4-24
4-9 4-22, 4-23, 4-24
4-6, 4-7 4-22, 4-23, 4-24
4-9 4-22, 4-23, 4-24
4-6, 4-7 4-30, 4-31, 4-32
4-6, 4-7 ,4-9 4-30, 4-31, 4-32
4-9 4-30, 4-31, 4-32
4-6, 4-7 4-30, 4-31, 4-32
4-9 4-30, 4-31, 4-32
Reference
Section
A, B
A, B, E
A,C
A,C, E
A, D
A, D, E
15