Heatilator NA36 Installation & Operating Instructions Manual page 23

NA SERIES INSTALLATION INSTRUCTIONS
2. Chase Top
Construct a chase of desired materials maintaining a
minimum 2” air space around the chimney.
3. Termination Cap
Install the chimney sections up through the chase
enclosure. When using a TR344/NATR344 round
termination cap, the uppermost top section of pipe
must extend 6” above the top of the chase collar
to allow installation of the storm collar and
termination cap. See Figure 22.
For installations utilizing a TR342 telescoping
round termination cap, the uppermost chimney
section must be below the top of the chase top,
but not more than 14½” below the top of the chase
top flashing collar. See Figure 23.
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