DuraVent DirectVent Pro, Installation Instructions Manual

6

Figure 3

chimney, a Top Adapter (985K) and Flashing 
are used at the top of the masonry chimney.  
The 4-inch aluminum liner is connected to 
the adapter and is passed down the chimney 
and out through the masonry wall.  This 
is attached to the Retro Connector (909B) 
which is in turn, attached to the masonry wall 
and is then connected to the direct vent pipe 
leading to the appliance.

INSTALLATION  INSTRUCTIONS  

FOR  CONVERTING  A FACTORY  

BUILT  METAL  CHIMNEY

Step 1.  Remove the existing chimney cap.

Step 2.  Measure the distance from the top 
end of the chimney to the bottom of the 
ceiling support box, add 3 inches to this 
measurement, and cut a section of 4-inch flex 
pipe to that length (the flex should already be 
extended to its nominal length).

Step 3.  Connect the end of the flex pipe 
section to the underside of the Top Adapter 
you have selected, using (3) sheet metal 
screws. (Figure 2.)

Step 4.  Pass the flex pipe down through the 
center of the chimney system, and center 
the adapter on the top of the chimney pipe.  
Drill (4) 1/8-inch diameter holes through the 
adapter, and into the chimney top.  Insure 
that you are in fact, drilling into the metal on 
the chimney. Twist-lock the Termination Cap 
(980 or 991) onto the Adapter.  (Figures 3 and 

4.)

Step 5.  Pull the flex pipe down through 
the ceiling support box, until it protrudes 
approximately 3 inches.  Connect the flex 
pipe to the Retro Connector by slipping it 
into the 4-3/4-inch diameter sleeve on the 
top side of the Connector.  Use (3)  Sheet 
Metal Screws, to assemble these two parts.

Figure 2

Top Adapter

Flex Pipe

Sheet Metal 

Screws