Heatiator C40 owner manual C. Using Offsets/ Returns, Table, Example

C. Using Offsets/ Returns

•Use an offset/return to bypass overhead obstructions.

•An offset and return can be used as a single entity or separated by chimney section(s).

Warning! Risk of Fire! Do not use offset/returns greater than 30°. Chimney draft will be restricted and could cause over- heating and fire. Secure offsets vwith screws ( not to exceed 1/2” / 13 mm in length) Secure returns with strapping. Straight chimney sections may be secured with screws. Keep chimney sections from separating or twisting.

•Measure the shift needed to aVOID the overhead obstruction. Refer to dimension A in Figure 8.3.

•Find the appropriate A dimension listed in Table 8.2. The B dimension coinciding with the A dimension measurement in Table 8.2 represents the required vertical clearance needed to complete the offset/return.

•Read across the chart to find the number of chimney sections/model numbers needed between the offset and return.

A

B

1-1/4 in. (32 mm)

OVERLAP

Figure 8.3 Chimney Offset/Return

Example:

Your “A” dimension from Figure 8.3 is 14 1/2 in. (368 mm). Using Table 8.2 the dimension closest to, but not less than 14 1/2 in. (368 mm) is 14 1/2 in. (368 mm) us- ing a 30° offset/return.

You determine from the table that you 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.

Table 8.2

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

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.

Page 44 Heatilator • Constitution EPA Fireplace • 480-1091H 4/12