If more than one termination is located in the same chase or within the same general proxim- ity, we suggest they should be separated in distance at least 24" (610 mm) horizontally from flue center to flue center and stacked or staggered vertically at least 18" (457 mm) apart, from the termination of one smoke exit to the termination of another smoke exit (Figure 34 ).
18" 
(457mm)
18" (457mm)
24" 
(610mm)
Figure 34
This suggestion is provided in the interest of better operation. If the terminations are located too close to each other, smoke may migrate from one flue into the other.
FTF10 CHIMNEY COMPONENT CALCULATIONS
The minimum installed height of the completed fireplace fireplace system is 16'0" (4.8 m). The maximum system height is 80'0" (24.38 m).
To determine the number of chimney sections and chimney components required, follow these steps:
1.Determine total vertical height of the fireplace installation. This dimension is the distance from the surface the fireplace sets on to the point where smoke exits from the termination.
2.Determine the number of chimney compo- nents required, except chimney sections. This would include firestop spacers, stabilizers, roof flashing, etc.
3.The effective heights of the components are:
The Fireplaces | = | 65 | ¹⁄₄" (1657 mm) |
= | 10 | ¹⁄₄" (260 mm) | |
= | 16 | ¹⁄₄" (413 mm) | |
= | 34 | ¹⁄₄" (870 mm) | |
CTDTM Termination | = | 10" (254 mm) | |
CT2 Termination | = | 15" to 23" | |
|
| ||
S4 Stabilizer * | = | 3" (76 mm)* | |
*Required for every 30' (9.1 m) of vertical chimney and/or 10' of offset chimney.
4.Determine amount of chimney height re- quired by subtracting total combined height of all
Reference Vertical Elevation Chart and determine the number of chimney sections (quantity and length) required.
SPECIAL OFFSET INSTRUCTIONSTo clear any overhead obstructions, you may offset your chimney system using Security's 30° offset and return elbows. Use two elbows
-an offset elbow to initiate the offset and a return elbow to terminate it. A 30° offset elbow, angling in any direction, may be the first component used off the top of the fire- place flue collar.
The offset and return elbows may be attached together, or a section or sections of chimney may be used between, but must not exceed 20' (6.1 m) in total length between elbows (Figure 36 ). If sections of pipe exceed 10' (3
m)between elbows, a chimney stabilizer must be used at the midpoint. The stabilizer sup- port straps must be attached under tension (in shear) to structural framing members above. When two sets of elbows are used, the maximum combined length of chimney used between elbows cannot exceed 20' (6.1 m)
(Figure 37 ). Example: If C1 = 10' (3 m) then C2 cannot exceed 10' (3 m).
If an offset exceeds 6' (1.8 m) in length, each chimney joint beyond the first 6' (1.8 m) of offset to the return elbow, must be secured by a No. 8 x ¹⁄₂" sheet metal screw located at the underside of the joint (Figure 38 ).
A ¹⁄₈" (13 mm) diameter hole must be drilled in the chimney joint using a ¹⁄₈" (13 mm) diameter drill. Hole should be drilled in center of joint overlap (Figure 39 ). Be sure to drill only
Less Than 10' (3m)
2' Min. (610mm) 2' Min. (610mm) 
2' Min.
(610mm)
3' Min.
(916mm)
Figure 35
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
through the outer chimney casting. Do not puncture the inner flue.
Maximum offset of chimney system is 30° . Two offsets must not be assembled to form a 60° offset. However, two sets of offset and return elbows may be used on a single flue system, provided the total height of the system exceeds 22' (6.7 m) (Figure 42 ).
Return elbow support straps must be securely attached under tension (in shear) to structural framing members above. Do not substitute a
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