Mastic Spark Modern Fires 91P - Manual (Page 19)

18 L100001 19
VENT INSTALLATION
HORIZONTAL TERMINATION CONFIGURATIONS — RIGID VENTING
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 various
dimensions allowable. See page 16.
Minimum clearance between vent pipes and combustible materials is
4 " on top and 1" from bottom and sides unless
otherwise noted.
When vent
terminations exit through foundations less than 20" below siding outcrop, the vent pipe must flush up with the sid-
ing.
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.
Figure 18 - Maximum Three (3) 90 Elbows
Per Installation
• The maximum number of 90° elbows per side wall installation is three (3) , the maximum horizontal run is 20" (Figures 18, 19)
Figure 19 - Maximum Horizontal Run with 2 foot rise
20"
Max.
2' min
The Commonwealth of Massachusetts requires the installation and USE of Carbon Monoxide detectors
in the rooms of ALL direct vent units which utilize a SIDE WALL VENTING TERMINATION
FOR STATE OF MASSACHUSETTS:
3 x 90o Elbows