Horizontal Termination Configurations - Majestic 300DVBH Installation And Operating Instructions Manual

VENT INSTALLATION

HORIZONTAL TERMINATION CONFIGuRATIONS

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 vertical and horizontal side wall venting, will help to determine the vari-
ous dimensions allowable. See Figure 13, page 17.
NOTE: Horizontal sections of this vent system require a minimum of 3" clearances to combustibles at the top of the
flue and 1" clearance at the sides and bottom until the flue penetrates the outside wall. A minimum 1" clearance all
around the flue is acceptable at this point of penetration.
Vertical sections of this vent system require a minimum of 1" clearance to combustibles on all sides of the pipe.
When vent exits through foundations less than 20" below outcrop, the termination must be flush up with outcropped wall
above.
It is best to locate the fireplace in such a way that minimizes 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.
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 calculating
venting layouts.
• The maximum number of 90° elbows per side wall installation is three (3). See Figure 21.
• 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). See Figure 22.
3 x 90°
Elbows
Figure 21 - Maximum Three (3) 90° Elbows
Per Installation
0
3 x 90°
Elbows
36"
Max.
Figure 22 - Maximum Horizontal Run with No Rise
36"
Max.
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