ASSEMBLY AND INSTALLATION OF THE DOUBLE
WALL CHIMNEY SYSTEM
Each double wall chimney section is consist of a galvanized outer pipe, a stainless steel inner flue pipe and a wire spacer. The pipe sections must be assembled independently as the chimney is installed. When connecting chimney directly to the fireplace, the inner flue pipe section must be installed first with the lanced side up. The outer pipe section can then be installed over the flue pipe section with the hemmed end up. Press down on each pipe section until the lances securely engage the hem on the fireplace starter. The wire will assure the proper spacing between the inner and outer pipe sections.
WARNING: The opening in the collar around the chimney at the top of the fireplace must not be obstructed. Never use blown insulation to fill the chimney enclosure.
Continue to assemble chimney sections as outlined above, making sure that both the inner and outer pipe sections are locked together. When installing double wall “snap lock” chimney together, it is important to assure the joint between the chimney sections is locked. Check by pulling chimney upward after locking. The chimney will not come apart if properly locked. It is not necessary to add screws to keep the chimney together (exception – see page 6 figure 12).
ADJUSTABLE FIRESTOP THIMBLE (FST-A):
The Adjustable Firestop Thimble Assembly
To install the thimble assembly, determine the distance between the ceiling joist and the roof framing. Attach the adjustable thimble to the firestop spacer so that the assembly will cover the distance. The adjustable thimble should be even with or above the roofline (see thimble extensions on page 12 if a longer thimble is needed). Sheet metal screws or staples may be used to attach the thimble to the firestop spacer.
Figure 8 FIRESTOP THIMBLE
An opening large enough to allow the insertion of the firestop thimble assembly will be required in the ceiling. Attach the firestop/thimble assembly to the ceiling/ceiling joist using screws or staples as shown in figure 8. A minimum of 8 screws or staples should be used.
Figure 9 FIRESTOP THIMBLE ASSEMBLY |
The firestop thimble assembly should also be used where there is a cathedral ceiling, insulation barrier and roof, all in one assembly in a manufactured home. The
An opening big enough to allow the insertion of the firestop thimble assembly will be required. This opening depends on the pitch of your ceiling. If your ceiling is a flat or 12”/96” pitch, you must use the adapter plate provided to seal unwanted openings since the opening in the firestop is an ellipse. For 30”/144” pitch, discard the adapter.
Figure 10 | FIRESTOP THIMBLE |
For more information, visit www.desatech.com |
