Napoleon Fireplaces GDS25N GDS25P Horizontal Termination, Definitions, Elbow Vent Length Values

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DEFINITIONS

for the following symbols used in the venting calculations and examples are:

>- greater than

>- equal to or greater than < - less than

< - equal to or less than

HT - total of both horizontal vent lengths (HR) and offsets (HO) in feet

HR - combined horizontal vent lengths in feet

HO - offset factor: .03(total degrees of offset - 135°*) in feet

VT - combined vertical vent lengths in feet

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ELBOW VENT LENGTH VALUES

 

feet

inches

0.03

0.5

15°

0.45

6.0

30°

0.9

11.0

45°*

1.35

16.0

90°*

2.7

32.0

*the first 45º and 90° offset has a zero value and is shown in the formula as -45°and -90ºrespectively or -135ºwhen combined.

HORIZONTAL TERMINATION

when (HT) < (VT)

90°

FIGURE 5

For vent configurations requiring more than one 45º and 90° elbow, the following formulas apply:

Formula 1: HT < VT

Formula 2: HT + VT < 40 feet

Example 1:

90° H2

FIGURE 6

V1

45º 45º

Simple venting configuration (only one 45º and 90° elbow)

H1

90°

REQUIRED VERTICAL R I S E I N FEET (VT)

3940

30

20

10

0

2.5

5

7.5

10

12.5

15

17.5

20

V1

=

8 ft

VT

= V1 = 8 ft

H1

=

2.5 ft

H2

=

2 ft

HR

= H1 + H2 = 2.5 + 2 = 4.5 ft

HO

= .03(one 45º elbow + two 90º elbows - 135º)

=0.3(225-135º) = 2.7ft

HT

=

HR + HO = 4.5 + 2.7 = 7.2 ft

CALCULATED HORIZONTAL VENT RUN PLUS OFFSETS IN FEET (HT)

The shaded area within the lines represents acceptable values for HT and VT .

HT + VT = 7.2 +8 =15.2ft

Formula 1: HT < VT 7.2 < 8

Formula 2: HT + VT < 40 feet 15.2 < 40

Since both formulas are met, this vent configuration is acceptable.

W415-0547 / B / 05.08.06

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Contents W415-0547 / B What to do if YOU Smell GAS Table of Contents Napoleon GAS Fireplace Presidents Lifetime Limited Warranty Care of GLASS, and Plated Parts General InstructionsGeneral Information Location & Clearances Stove DimensionsAccent Lite Replacement Blower InstallationAIR Terminal Locations Part Supplier Typical Corner Install With Zero RiseVenting Venting Lengths AIR Terminal LocationsSpecial Vent Installations Typical Vent InstallationsRequired Vertical R I S E I N Feet VT Horizontal TerminationDefinitions Elbow Vent Length ValuesHT + VT Formula 2 HT + VT 24.75 feetHT VT Vertical Termination+ VT =HR + HO = 8 + 5.4 = 13.4 ft = 13.4 + 2.5 = 15.9 ft 3VTVertical Through Existing Chimney InstallationWall and Ceiling Protection Vertical InstallationHorizontal Installation ¼ Inch Rise PER Foot Vertical Venting InstallationPER Foot Restricting Vertical Vents Mobile Home InstallationGAS Installation Stove Vent ConnectionDoor Latches Cast Front InstallationSwitch Functions FinishingLOG Placement Logo PlacementWire Size MAX. Length Optional Switch / Wiring DiagramTo Turn OFF GAS Operating InstructionsVenturi Adjustment AdjustmentsMaintenance Pilot Injector and Orifice ReplacementReplacements Page Symptom Problem Test Solution Trouble Shooting GuideDo not Clean Glass When HOT SymptomFireplace Service History