B. Clearances
Warning! Risk of Fire! You must comply with all minimum air space clearances to combustibles as specified in Fig- ure 6.2. Do NOT pack required air spaces with insulation or other materials.
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| 1 1/2” Ventilation Opening | |
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| around Chimney Pipe | |
| Storm collar must |
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1/2 in. air space | be installed 1 in. |
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off chase top | Chase Top |
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established by | 1 in. | ||
spacers |
| Flashing |
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1/2 in. |
| Roof |
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Air Space |
| Radiation Shield |
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Spacers furnished with | 1/2 | (attic) | |
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complete Chase Top Flashing |
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(May be |
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CHASE TOP CLEARANCES
(insulation)
Storm Collar
Chase Top Flashing
(roof)
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Attic Shield Collar
Attic Insulation Shield
(ceiling)
2 in. (51 mm) min. 
(ceiling)
Combustible Object
Ceiling Firestop 
48 in. 1219 mm
0 in.
to floor
Must have 2 in. (51 mm)
minimum clearance
to any combustible materials
including header
0 in. to level of standoffs
to back & sides of appliance (except at nailing flanges where it is 1/2 in. [13 mm])
Figure 6.2 Air Space Clearances
Heatilator • Birmingham | 19 |