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Calculating Vent System Length
To calculate the length of the system you need, add the
equivalent feet (meters) for each vent piece used in the system.
7" (17.8 cm) Round Vent System
Vent Piece
45° elbow
90° elbow
7" (17.8 cm) wall cap
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
to 7" (17.8 cm)
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
to 7" (17.8 cm) 90° elbow
Example vent system
7" (17.8 cm) round
90˚ elbow
2 ft (0.6 m)
Maximum Recommended Length
1 - 90° elbow
1 - wall cap
8 ft (2.4 m) straight
Length of 7" (17.8 cm) system
6
All manuals and user guides at all-guides.com
Round
2.5 ft
(0.8 m)
5.0 ft
(1.5 m)
0.0 ft
(0.0 m)
4.5 ft
(1.4 m)
5.0 ft
(1.5 m)
Wall cap
6 ft (1.8 m)
= 50 ft (15.2 m)
= 5.0 ft (1.5 m)
= 0.0 ft (0.0 m)
= 8.0 ft (2.4 m)
= 13.0 ft (3.9 m)
3¹⁄₄" x 10" (8.3 cm x 25.4 cm) Vent System
Vent Piece
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
90° elbow
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
flat elbow
3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
wall cap
Example vent system
¹⁄₄
3
" x 10"
(8.3 x 25.4 cm)
elbow
6 ft (1.8 m)
2 ft
(0.6 m)
Maximum Recommended Length
1 - 90° elbow
8 ft (2.4 m) straight
1 - wall cap
Length of 3¹⁄₄" x 10" (8.3 cm x 25.4 cm)
system
Electrical Requirements
Observe all governing codes and ordinances.
Ensure that the electrical installation is adequate and in
conformance with National Electrical Code, ANSI/NFPA 70 (latest
edition), or CSA Standards C22.1-94, Canadian Electrical Code,
Part 1 and C22.2 No. 0-M91 (latest edition) and all local codes
and ordinances.
If codes permit and a separate ground wire is used, it is
recommended that a qualified electrician determine that the
ground path is adequate.
A copy of the above code standards can be obtained from:
National Fire Protection Association
One Batterymarch Park
Quincy, MA 02269
CSA International
8501 East Pleasant Valley Road
Cleveland, OH 44131-5575
A 120 volt, 60 Hz., AC only, 15-amp, fused electrical circuit is
required.
5.0 ft
(1.5 m)
12.0 ft
(3.7 m)
0.0 ft
(0.0 m)
Wall cap
= 35 ft (10.7 m)
= 5.0 ft (1.5 m)
= 8.0 ft (2.4 m)
= 0.0 ft (0.0 m)
= 13.0 ft (3.9 m)
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