4
FUTERA FUSION INSTALLATION AND OPERATION INSTRUCTIONS
All Air From Inside The Building
If the Futera Fusion is to be located in a confined
space, the minimum clearances listed in Table 1 must be
maintained between it and any combustible construction.
When installed in a confi ned space
without the intake
air option,
Figures 5, and 6, two permanent openings
communicating with an additional room(s) are required.
The combined volume of these spaces must have
suffi cient volume to meet the criteria for an unconfi ned
space. The total air requirements of all gas utilization
equipment, fireplaces, wood stoves or any type of
exhaust fan must be considered when making this
determination. Each opening must have a minimum free
area of
1 in
2
/1000 Btu/hr
,
2200 mm
2
/kW
based on the
total input rating of ALL gas utilization equipment in the
confined area. Each opening must be no less than
100 in
2
,
64,516 mm
2
in size. The upper opening must
be within
12 in
,
305 mm
of, but not less than
3 in
,
76 mm
from, the top of the enclosure. The bottom
opening must be within
12 in
,
305 mm
of, but not less
than
3 in
,
76 mm
from, the bottom of the enclosure.
All Air From Outside The Building
When installed in a confi ned space
without utilizing the
intake air option
two permanent openings communicating
directly with, or by ducts to, the outdoors or spaces that
freely communicate with the outdoors must be present. The
upper opening must be within
12 in
,
305 mm
of, but not
less than
3 in
,
76 mm
from, the top of the enclosure. The
bottom opening must be within
12 in
,
305 mm
of, but not
less than
3 in
,
76 mm
from, the bottom of the enclosure.
Where directly communicating with the outdoors
or communicating with the outdoors through vertical
ducts, each opening shall have a minimum free area of
1 in
2
/4000 Btu/hr
,
550 mm
2
/kW
of the total input rating
of all of the equipment in the enclosure.
Where communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of
1 in
2
/2000 Btu/hr
,
1100 mm
2
/kW
of the total input rating
of all of the equipment in the enclosure.
When ducts are used, they must have the same cross-
sectional area as the free area of the opening to which they
connect.
When calculating the free area necessary to meet the
make-up air requirements of the enclosure, consideration
must be given to the blockage effects of louvers, grills and
screens. Screens must have a minimum mesh size of
1/4 in
,
6.4 mm
. If the free area through a louver or grill is
not known, ducts should be sized per Table 2.
Table 2 – Make-up Air Louver Sizing
Required Cross Sectional Area
Input
1/4 in
6.4 mm
75% Free Area
25% Free Area
(MBH)
Wire Screen
Metal Louvers
Wooden Louvers
in
2
cm
2
in
2
cm
2
in
2
cm
2
500
125
806
167
1077
500
3226
750
187
1206
250
1613
750
4839
1000
250
1613
333
2148
1000
6452
1250
313
2019
416
2684
1250
8065
1500
375
2419
500
3226
1500
9677
1750
437
2819
583
3761
1750
11,290
1999
500
3226
667
4303
2000
12,900
Canadian installations must comply with CSA B149.1 when
air supply
is provided by natural air fl ow from the outdoors
for
natural draft
, partial fan-assisted, fan-assisted, or
power draft-assisted
burners
, there shall be a permanent
air supply
opening(s) having a cross-sectional area of not
less than
1 in
2
per
7,000 Btuh
(310 mm
2
per kW)
up to
and including
1 million Btuh,
plus
1 in
2
per 14,000 Btuh
(155 mm
2
per kW)
in excess of
1 million Btuh
.
Intake Air Option – General Guidelines
This confi guration provides combustion air directly to the
boiler/water heater’s air intake using a dedicated pipe when
using the direct vent option. The RBI air intake adapter
must be fi tted to the blower inlet. Combustion air can be
drawn in horizontally through the same outside wall which
terminates the exhaust gases or vertically through the roof,
see Figures 1, 2, 3 & 4.
WARNING: Common intake air systems may be
used provided the common duct is sized properly
and an intake combustion air damper is installed
in the intake air pipe of each heater. Improper
installation can result in excessive levels of carbon
monoxide which can cause severe personal injury
or death!
Single wall galvanized smoke pipe, single wall aluminum
pipe, fl exible aluminum pipe, PVC or CPVC pipe can be
used for the intake air pipe. It must be sized per Table 3.
Table 3 - Intake Air Pipe Sizing
Model
For Vertical
For Horizontal
Size
(Up To 60')
in
mm
in
mm
500
8
203
6
152
750
8
203
6
152
1000
8
203
6
152
1250
10
254
8
203
1500
10
254
10
254
1750
12
305
12
305
2000
12
305
12
305
All joints in metal intake air systems must be secured using
corrosion resistant fasteners and sealed using a suitable
Silicone caulk. If PVC or CPVC is used, the joints must be
cleaned with a suitable solvent and connected using a
solvent based PVC cement.
The combustion air system
MUST be supported by the building structure not the
boiler/water heater.
