Hearth and Home Technologies EM-415H owner manual Using Offsets/Returns

B. Using Offsets/Returns

To bypass any overhead obstructions, the chimney may be offset using an offset/return.

An offset and return may be attached together or a chimney section(s) may be used between an offset and return.

Perform the following steps to determine the correct chim- ney component combination for your particular installation:

WARNING

Fire Risk

•Draft will be restricted if offset/returns greater than 30° are used.

•Measure how far the chimney needs to be shifted to enable it to avoid the overhead obstacle. See Figure 5.3. Use dimension “A” to determine chimney section required to achieve the needed shift.

•After determining the offset dimension, refer to Table 5.2 and find the “A” dimension closest to but not less than the distance of shift needed for your installation.

•The “B” dimension that coincides with the “A” dimension represents the required vertical clearance that is needed to complete the offset and return.

•Read across the chart and find the number of chimney sections required and the model number of those particular chimney parts.

•Whenever the chimney penetrates a floor/ceiling, a ceiling firestop must be installed.

•The effective height of the fireplace assembly is measured from the base of the fireplace to the top of the starter collar. See Dimensions in Section 12.

Table 5.2

	15-degree				30-degree
A		B		A		B
in.	mm	in.	mm	in.	mm	in.	mm	SL306	SL312	SL318	SL324	SL336	SL348
1-5/8	41	13-3/8	340	3-5/8	92	15-1/2	394	-	-	-	-	-	-
2-7/8	73	17-3/4	451	5-1/2	140	18-5/8	473	1	-	-	-	-	-
4-1/8	102	22-3/8	568	7-1/4	184	21-3/4	552	2	-	-	-	-	-
4-1/2	114	23-5/8	600	8-1/2	216	23-3/4	603	-	1	-	-	-	-
5-3/4	146	28-1/4	718	10-1/4	260	27	686	1	1	-	-	-	-
6	152	29-3/8	746	11-1/2	292	29	737	-	-	1	-	-	-
7-1/4	184	34	864	13-1/4	337	32-1/8	816	-	2	-	-	-	-
7-3/4	197	36-1/8	918	14-1/2	368	34-1/8	867	-	-	-	1	-	-
8-3/4	222	39-3/4	1010	16-1/4	413	37-3/8	949	1	-	-	1	-	-
10-3/8	264	45-5/8	1159	19-1/4	489	42-1/2	1080	-	-	2	-	-	-
10-5/8	270	46-3/4	1187	20-1/2	521	44-5/8	1133	-	-	-	-	1	-
11-7/8	302	51-3/8	1305	22-1/4	565	47-3/4	1213	1	-	-	-	1	-
13-1/2	243	57-1/4	1454	25-1/4	641	52-7/8	1343	-	-	-	2	-	-
13-3/4	349	58-3/8	1483	26-1/2	673	55	1397	-	-	-	-	-	1
15	381	63	1600	28-1/4	718	58-1/8	1476	1	-	-	-	-	1
16-1/2	419	68-3/4	1746	31-1/4	794	63-1/4	1607	-	1	-	-	-	1
18	457	74-5/8	1895	34-1/4	870	68-1/2	1740	-	-	1	-	-	1
19-5/8	498	80-3/8	2042	37-1/4	946	73-3/4	1873	-	-	-	1	-	1
20-5/8	524	84-1/8	2137	39-1/8	994	76-7/8	1953	1	-	-	1	-	1
22-3/4	578	91-7/8	2334	43-1/4	1099	84-1/8	2137	-	-	-	-	1	1
24	610	96-1/2	2451	45-1/8	1146	87-1/4	2216	1	-	-	-	1	1
25-7/8	657	103-1/2	2629	49-1/4	1251	94-1/2	2400	-	-	-	-	-	2

Proper assembly of air-cooled chimney parts result in an overlap at chimney joints of 1-1/4 in. (32 mm). Effective length is built into this chart.

A

B

1-1/4 in. (32 mm)

OVERLAP

Figure 5.3 Chimney Offset/ Return

Example: Your “A” dimen- sion from Figure 5.3 is 14 1/2 in. (368 mm). Using Table 5.2 the dimension closest to, but not less than 14 1/2 in. (368 mm) is 14 1/2 in. (368 mm) using a 30° offset/return. It is then determined from the table that you would need 34 1/8 in. (867 mm) (Dimension “B”) between the offset and return. The chimney component that best fits your application is one SL324.

18 Heat & Glo • EM-415/EM-415H • 31317 Rev Q • 10/06