Heatilator Birmingham BIR50-B Installation Manual page 21

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three screws or nails per side.
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Storm collar must
1/2 in. air space
be installed 1 in.
established by
off chase top
spacing clips
1/2 in. Air Space
Spacing Clips
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20 ft insert-guard screening
are included with the unit.
Figure 4.13
Field-Constructed Chase Top Flashing
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materials.
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around all four sides.
• Include a minimum 1 in. turn down and a 1/2 in. drip
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• Seal chase top collar section to flashing with non-
hardening waterproof sealant to ensure a weather tight
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Heatilator • Birmingham BIR50-B Installation Manual • 4059-701• Rev AA • 06/23
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three screws or nails per side.
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Figure 4.14
Chase top
flashing
Roof
radiation
shields
Chase Top
Required
Collar
spacing
clips
Screws
to hold
flashing to
chase top
Additional
Structural Support
Figure 4.15
1 1/2 in. ventilation
opening around
chimney pipe
Figure 4.16
1 1/2 in. ventilation
opening around
chimney pipe
Roof Radiation Shields
placed here
Chase Top Collar
Slope downward
Turn-down
Drip edge
Insect-guard screening
may be added between
chase and chase top
flashing.
Sealant
Screw or
Pop-rivet
Insect
Screen
21