Marquis MQRB4436N Installation Instructions Manual page 89

Wall Thimble Shield
Note that the minimum height from the bottom of fireplace to the centre of vent is 37-1/2" [95 cm] for the
for the and 56-1/2" [144cm] for the
rise from the unit (i.e. zero/minimum horizontal length). In installations where there is a horizontal run simply refer to the Horizontal Vent
Table to determine the vertical location of the hole cutout required.
1. In a combustible wall cut a square hole that is 11" x 11" [28cmx28cm] (inside dimension) for the MQRB4436 / MQRB5143 or 13-
3/4" x 13-3/4" [35cmx35cm] for the MQRB6961. In a non-combustible wall, cut an 8" [20cm] diameter hole for the MQRB4436 /
MQRB5143 or an 11" [28cm] diameter hole for the MQRB6961. See below for detail.
2. Refer to
precise measurements are not needed as the flex pipe can be expanded to twice its shipped length.
3. If installing the wall thimble, center it over the square cutout hole and secure both pieces on either sides of the wall. Route the flex
vent pipe through the wall thimble. Before joining pipes, apply a bead of high temperature sealant (Millpac) to the end. Then attach
the inner pipe to the vent termination with sealant, and secure it with the four screws provided. At this time make sure the spacer
springs are attached to the inner flex pipe. Then attach the outer pipe by the same method.
4. Mount the vent termination and seal it to wall using caulking around the thimble to weather proof. After installing the vent
termination, double check to make sure the pipe extends properly through wall thimble and into the termination. Before joining
pipes to the fireplace flue, apply a bead of high temperature sealant (Millpac) to the end of it. Then attach the inner flue pipe to
fireplace with sealant; and secure with the four screws provided. At this time verify that the spacer springs are attached properly to
the inner pipe and then attach the outer pipe by the same method.
5. Support the horizontal pipe every 2ft [61cm] with metal strap bands. Verify that the fireplace is leveled, properly positioned, and
secured to the framing.
6. Support vertical pipes with metal strapping to maintain a minimum of 1" [2.5cm] or greater clearance to combustibles.
MQRB4436 / MQRB5143
must be used in Enclosures under 72" for MQRB4436 / MQRB5143, and under 78" for MQRB6961.
. This dimension is for installations where venting exits immediately after its
information in this manual. Select the approximate vent length for your installation. Note that
37-1/2" Min -MQRB4436
51-1/2" Min -MQRB5143
Vertical rise over 3ft horizontal run (MQRB5143 shown).
MQRB6961
3ft
52-1/4"Min
, 51-1/2" [131 cm]
56-1/2" Min
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