Heatilator A36C - Offsets;Returns

Heatilator • A36/42C, A36/42CH • Installers Manual • 4017-262 • Rev D • 10/07/13
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B. 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
overheatingandre.Secureoffsetswith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4.2.
• FindtheappropriateAdimensionlistedinTable4.3.TheBdimensioncoincidingwiththeAdimensionmeasurementin
Table4.3representstherequiredverticalclearanceneededtocompletetheoffset/return.
• Readacrossthecharttondthenumberofchimneysections/modelnumbersneededbetweentheoffsetandreturn.
A
B
1-1/4 in. (32 mm)
OVERLAP
Figure 4.2 Chimney Offset/Return
Table 4.3 Offset Dimensions
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re-
turn.
Thechimneycomponentthatbesttsyourapplicationis
oneSL324.
15-degree 30-degree
SL306 SL312 SL318 SL324 SL336 SL348
A B A B
in. mm in. mm 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 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.