Tjernlund GPAK-J,JT,1,1T (Discontinued) 8504013 Rev 3 09/97 - Manual (Page 7)

DRAFT CONTROL INSTALLATION
When installing any GPAK-Series Side Wall Venting System on a fan assisted furnace a barometric draft control must be added. The
draft control provides pressure relief to neutralize over-drafting and allows a means of draft adjustment for optimum furnace efficiency.
By adjusting the draft control the installer can obtain the furnace manufacturer’s recommended draft setting.
Install the vent pipe and draft control as shown in the diagrams below. The draft control should connect to a tee off of the furnace flue
outlet.
The GPAK-Series Venting System may only be used with furnaces capable of being chimney vented. It is not suitable for use
on high-efficiency, condensing models.
POWER VENTER MOUNTING
1. Slide the outlet of the Power Venter over the inlet of the Vent Hood and connect them together using the provided screws,(See
Diagram D). If you are unable to make a direct connection to the Vent Hood, vent pipe may be installed between the Power Venter
and Vent Hood. However, all vent pipe connections after the Power Venter must be sealed with high temperature silicone caulk or
aluminum vent pipe tape to prevent flue gas leakage, (See Diagram E).
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DIAGRAM D DIAGRAM E
(HORIZONTAL FURNACE)
(UPFLOW FURNACE)
NOTE: DRAFT CONTROL
ONLY NECESSARY ON
APPLIANCES WITHOUT
DRAFT HOOD OR DRAFT
DIVERTER