424WBST Designer Woodburning Fireplaces
Install Remainder of Chimney Sections
Since you have already preplanned the height of your termination according to the Ten Foot Rule, continue to install pipe to the predetermined height.
Check the chimney top installation instructions for details on how high above the roof top the chimney sec- tions (all pipes) should extend.
Installing Top Housing or Termination
Air Space Clearances
Combustible framing material MUST NOT penetrate AIR SPACE (shaded areas).
156O"
(38 mm) 
Standoff
Follow the installation instructions provided with the chimney termination you have selected.
Installing Chimney In a Chase
Refer to Page 5, Figure 4 for an illustration of a typical chase installation.
CAUTION: Treatment of firestop spacers and construc- tion of chase may vary with type of building. These instructions are not a substitute for local building codes. You must check your local building codes to determine specific requirements for your city or state. Note: Other building materials may be required in addition to Firestop Spacers.
Finishing
CAUTION: All joints between the finished wall and the fireplace surround (top/sides) must be sealed with non- combustible material to prevent cold air leakage into the room. Only noncombustible material may be applied to the facing of the fireplace surround. (Black painted area) (Fig. 20)
Finish Wall
Finish the wall with material of your choice. Do not install a combustible mantel shelf less than 12" (305 mm) above the front opening. Do not install a mantel face plate less than 6" (159 mm) from
1/2" (13mm)
air space to sides
Front View
Wall
Shield
Only noncombustible material may be applied as facing to the black fireplace surround.
MaintainOUTER |
1/2"DOME(13 mm) |
air space |
to sides |
Side View
Firestop
1/2" (13 mm) Air Space to Sides
0" Clearance to Floor
Hearth Extension
FP717
top of fireplace opening. (Fig. 21) If a combustible material is used below a flat mantel shelf, consult your local building codes for minimum clearance from top of fireplace opening to bottom of mantel shelf.
Note: No side wall protection is required for fireplaces installed at 45° to two (2) side walls (corner installation).
Adjacent combustible side walls that are within 16" (406
mm)of fireplace opening must be protected with an MHSC Wall Shield Model SP40 or a specifically built wall shield described in Figure 20 & 24.
Often a decorative surround or vertical portion of the mantel is desired. If this is constructed of any combus- tible material, it must be within the safe zone indicated in Figure 24.
Fig. 20 Minimum clearances to combustibles.
14 | 87D1506 |