Lennox Hearth LSO-43 installation instructions Multiple Terminations, TEN Foot Rule Summary

Note: It is recommended that all exterior ex- posed metal chimney components; such as ter- minations, flashings, storm collars and/or flue be painted with a premium quality, high tem- perature, rust preventative paint designed for metal. This is especially important when instal- lations are made in abnormally adverse or corro- sive environments; such as near lakes, oceans or in areas with consistently high humidity condi- tions. Consult the paint manufacturers instruc- tions for proper preparation and application.

MULTIPLE TERMINATIONS

If more than one termination is located in the same chase or within the same general prox- imity, we suggest they should be separated in distance at least 24" horizontally from flue center to flue center and stacked or staggered vertically at least 18" apart, from the termina- tion of one smoke exit to the termination of another smoke exit (Figure 32 ).

FTF10 CHIMNEY COMPONENT CALCULATIONS

The minimum height for a complete system is 7' 8" if installed with FTF10-CT1 or FTF10-CTDT terminations. The maximum height is 80' 0".

To determine the number of chimney sections and chimney components required, follow these steps:

TEN FOOT RULE SUMMARY

The minimum chimney height above the roof and/or to adjacent walls and buildings is speci- fied by all major building codes.

If the horizontal distance from the peak of the roof is less then 10', the top of the chimney must be at least 2' above the peak of the roof.

If the horizontal distance from the chimney edge to the peak of the roof is more than 10' a chimney height reference point is established on the roof surface 10' horizontally from the chimney edge. The top of the chimney must be

18" (457mm)

24"

(610mm)

Figure 32

FTF10-CTD

FTF10-CTDT

18" (457mm)

24" (610mm)

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 Fireplace	=	49 ⁵⁄₈"
FTF10-12	=	10 ¹⁄₄"

at least 2' above this reference point. In all cases, the chimney cannot be less then 3' above the roof at the edge of the chimney.

The 2' in 10' rule is necessary in the interest of safety but does not ensure smoke-free opera- tion. Trees, buildings, adjoining roof lines, ad- verse wind conditions, etc., may require a taller chimney should the fireplace not draft properly (Figure 31 ).

This suggestion is provided in the interest of better operation. If the terminations are lo- cated too close to each other, smoke may migrate from one flue into the other.

FTF10-18	=	16 ¹⁄₄"
FTF10-36	=	34 ¹⁄₄"
FTF10-CTDT Termination	=	12" to 18"
FTF10-CT1 Termination	=	12" to 18"
FTF10-CT2 Termination	=	15" to 23"
FTF10-CTT Termination	=	6" to 14"
FTF10-ATT Termination	=	8" to 14"
FTF10-S4 Stabilizer *	=	3"*

Less than

10' (3m) To

Roof Peak

3'		2' (610mm)
			Min.
(914mm)
	Min.

10' (3m)

FTF10-CT1

3'

2' (610mm)(914mm)

Min.Min.

*Required for every 30' of vertical chimney and/or 10' of offset chimney.

4.Determine amount of chimney height re- quired by subtracting total combined height of all pre-selected components (fireplace and chimney components from total desired height.)

Reference Vertical Elevation Chart and deter- mine the number of chimney sections (quan- tity and length) required.

Figure 31

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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