Hearthstone Quality Home Heating Products, Inc
CARINA Series 8910
13
Vent Restrictors
Installations with extended vent runs may experience over-drafting and require the addition of a Vent Restrictor
(E or F). The best indication of over-drafting is a hyper-active flame pattern (flames that move too quickly). Over-
drafting may affect the pilot, causing it to lift off the flame sensing rod shutting off the unit.
Too much restriction will lead to ghosting or lifting flames - in this case less restriction is required.
The CARINA Fireplace Insert is supplied with two restrictor plates and provide restriction as follows:
No Restrictor Plate
—No Restriction
Plate “E” 1.75” diameter—Maximum Restriction
Plate “F” 2.00” diameter. —Minimum Restriction
Determine the flue restrictor needed for this application and install into the exhaust port on the insert body.
•Natural gas uses no restrictor from 10’ to 22’ and the 1.75”ID (E) restrictor from 22’ to 36’.
•Propane uses no restrictor for 10’ to 22’ and the 2.0” ID (F) for the 22’ to 36’ chimneys.
If you determine that a restrictor is required in your installation, place either the “E” or “F” restrictor into the
exhaust port of the fireplace insert body PRIOR to reconnecting the Vent Connector Plate to the insert body as
shown:
