Installation
o
utSide
f
reSh
-a
ir
c
onnection
:
This Heater must have adequate air for proper combustion in the room that it is installed.
A Fresh-air intake is strongly recommended for all installations
. Failure to install intake air may
Figure 8: Outside Air Connection.
e
xhauSt
a
nd
f
reSh
a
ir
i
ntake
l
ocationS
:
result in improper combustion as well as the unit smoking
during power failures.
The inlet to the intake must be below and a minimum of 12”
(30cm) away from the unit exhaust outlet.
Outside fresh air is mandatory when installing this
unit in airtight homes and mobile homes.
When connecting to an outside fresh air source, do not use
plastic or combustible pipe. A 3” minimum (76 mm) ID
(inside diameter) steel, aluminum or copper pipe or ducting
should be used. The inlet must have a screen installed. It is
recommended, when you are installing a fresh air system, to
keep the number of bends in the pipe to a minimum.
3" ID
(76 mm)
Optional
Elbow
Outside
Wall
18
1
/
4
"
(465mm)
14
7
/
8
"
(378mm)
11
3
/
8
"
(290mm)
5"
(128mm)
6
5
/
16
"
(161mm)
Figure 9: M-55-FS Inlet and Outlet Location.
This unit uses a 4” exhaust vent.
EXHAUST:
Base of unit to center of flue
18
1
/
4
”
(465 mm)
Center of unit to center of flue
6
5
/
16
”
(161 mm)
FRESH AIR INTAKE.
Base of unit to center of intake
14
7
/
8
”
(378 mm)
Center of unit to center of intake
5”
(128 mm)
10
