Finished Wall 
Vent |
Termination |
FP1005 |
Fig. 23 Side view of final unit location.
Rear Wall Vent Installations -
Flex Vent Pipe
Follow Steps 1 and 2 on Page 15.
Step 3
Install the 4” (102 mm) flex vent pipe to the appliance collars described in “General Information Assembling Vent Pipes”, Page 12. If the installation requires a 45° angle, grasp the vent pipe close to the appliance collar and bend to 45°. DO NOT exceed 45°. (Fig. 24)
Install the 7” vent pipe in the same manner as Step 2.
Termination 
Flex Section
Appliance Collars
FP1473
Fig. 24 Grasp the vent pipe close to the collar and bend to 45° angle. Do not exceed 45°.
NOTE: There must be a 1/2” (13 mm) rise in a 12” (305 mm) length of flex vent.
Step 4
Assemble the flex vent to the collars on the termination as you did on the appliance.
DVB4136 Direct Vent Gas Fireplace
Rise
FP1472
Fig. 25 There must be a 1/2” rise per foot length.
Vertical Sidewall Application
Since it is very important that the venting system maintain its balance between the combustion air intake and the flue gas exhaust, certain limitations as to vent configurations apply and must be strictly adhered to.
The Vent Graph, showing the relationship between ver- tical and horizontal side wall venting, will help to deter- mine the various dimensions allowable.
Minimum clearance between vent pipes and com- bustible materials is one inch (25 mm) on top, bot- tom and sides unless otherwise noted.
When vent termination exits through foundations less than 20” (508 mm) below siding outcrop, the vent pipe must flush up with the siding.
It is best to locate the fireplace in such a way that mini- mizes the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent pipe from the flue collar of the fireplace (or the top of the Transition Elbow) to the face of the outer wall.
Horizontal plane means no vertical rise exists on this portion of the vent assembly.
When installing the appliance as a rear vent unit, the 90° or 45° Transition Elbow attached directly to the rear of the unit is NOT INCLUDED in the following criteria and calculations, and unless specifically mentioned should be ignored when calcu- lating venting layouts.
•The maximum number of 90° elbows per side wall installation is three (3). (Fig. 26)
•If a 90° elbow is fitted directly on top of the fireplace flange the maximum horizontal vent run before the termination or a vertical rise is 36” (914 mm). (Fig. 27)
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