Top Vent Venting Runs - Montigo HW42DF Installation, Operation & Maintenance Manual

Converting to Top Vent/ Rear Vent
HW42DF Top Vent
Use the following instructions to convert a HW42DF, for Top Vent use:
1. Install the 5" inner flue cap on the rear flue outlet and secure the
cap in place with five screws, as shown in figure 7a.
2. Install the 8" outer flue cap on the rear flue outlet, and secure it
with five screws, as shown in figure 7a.
3. Install the flue gasket material and flue cover plate on the rear vent
Figure 8a. Flue cap installation for Rear Vented fireplace.
outlet . Fasten the plate with four screws, as illustrated below.
4. Install the 5" inner flue collar and the 8" outer flue collar in place
on the top vent outlet using 5 screws, as illustrated below.
Figure 7b. Flue collar installation, Top Vented HW42DF fireplace.
HW42DF Rear Vent
Use the following instructions to convert an HW42DF, for Rear Vent use:
1. Install the 5" inner flue cap on the top flue outlet and secure the
cap in place with five screws, as shown in figure 8a.
2. Install the 8" outer flue cap on the top flue outlet, and secure it
with five screws, as shown in figure 8a.
Part No. XG0191 - 031010
Installation
5" Inner Flue Cap
8" Outer Flue Cap
5" Inner Flue Collar
8" Outer Flue Collar
Figure 8b. Flue collar installation for Rear Vented fireplace.
3. Install the flue gasket material and flue cover plate on the top vent
outlet. Fasten the plate with four screws, as illustrated in figure 8b.
4. Install the 5" inner flue collar and the 8" outer flue collar in place
on the rear vent outlet using 5 screws, as illustrated below.
Figure 8b. Flue collar installation, Rear Vented HW42DF fireplace.

Top Vent Venting Runs

For the HW42DF Top Vent, there are two types of installations: A) Through-
The-Wall Installations and B) Vertical (Through-The-Roof) Installations.
A) Through-The-Wall Installations
Before you install any venting, you must determine whether the venting
run will be acceptable. Unacceptable venting can affect the fireplace's
combustion.
The Venting Graph
Measure the vertical height from the fireplace hearth to the centre of
the termination and the horizontal run from the from the fireplace flue
collar to the wall flange of the termination. Plot on the Venting Graph
(Fig. 9a) with an 'X'.
If the 'X' falls on or above the top boundary of the shaded area, the
installation is acceptable.
Important:
An inspection of the explosion relief flappers and door must be
made prior to lighting the fireplace. This will ensure the door gas-
keting material will provide an adequate seal during operation.
HW42DF Gas Fireplace
8" Outer Flue Cap
5" Inner Flue Cap
8" Outer Flue Collar
5" Inner Flue Collar
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