Hearth and Home Technologies BIR50-B owner manual Assemble Chimney Sections, Using Offsets/Returns

G. Assemble Chimney Sections

•Attach the first chimney section or offset onto the top of the fireplace (Figure 8.3). Sheet metal screws are required to connect chimney section to the fireplace starter collar. Continue to add additional sections of chimney as needed.

•Use a wall strap every eight feet of chimney height.

•For each additional chimney section use four of the sheet metal screws provided to make a secure connection between the chimney sections (Figure 8.4). Do not penetrate the inner liner of the chimney.

Figure 8.3

Figure 8.4

H. 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! Rish of Fire! Do not use offset/returns great- er than 30’. Chimney draft will be restricted and could cause overheating and fire.

•Measure the shift required to avoid the overhead obstruction (Offset, Figure 8.5).

•Find the appropriate offset dimension listed in Table 8.2.

•The rise (see Figure 8.5) coinciding with the offset dimension measurement in Table 8.2 represents the required vertical clearance needed to complete the offset/ return.

RISE

OFFSET

Figure 8.5

Table 8.2

Elbow	Chimney
Angle	Length
from	Between	Offset	Rise	Offset	Rise
Vertical	Elbows	Inches	Inches	Millimeters	Millimeters
15°	0	2 5/8	21 5/8	67	549
15°	12 in./305 mm	5 1/2	32 1/4	140	819
15°	18 in./457 mm	7 1/8	38	181	965
15°	36 in./914 mm	11 3/4	55 3/8	298	1407
15°	48 in./1219 mm	14 7/8	67	378	1702
30°	0	6 1/4	24 1/2	159	622
30°	12 in./305 mm	11 3/4	34	298	864
30°	18 in./457 mm	14 3/4	39 1/4	375	997
30°	36 in./914 mm	23 3/4	54 7/8	603	1394
30°	48 in./1219 mm	29 3/4	65 1/4	756	1657

26 Heatilator • Birmingham BIR50-B • 4059-682C • 8/12