The termination cap should be designed to inhibit down-drafting without restricting the exhaust discharge.
For the best draw the chimney termination should be at least 2 feet above the highest point of the roof that is within a 10 foot radius of the chimney.
When using a brick chimney, you must line the entire chimney with stainless steel liner. The liner must be 6" for the FC1500 and FC1700. The diameter of the chimney stack should be consistent throughout the length of the chimney.
The chimney size should be at least as large as the exhaust stack on the furnace , but not more than twice its size.
The chimney stack should have a built-in airtight clean out. WARNING: Do not operate with clean out uncapped.
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