Operator's Manual: Models Saturn™ 140 & Saturn™ 230
8-6
Installing the Make-up Air Louver
All louvers and grills, regardless of the material from which they are made, must be FIXED in the OPEN
position OR be interlocked with the appliance so that they will open automatically during the operation of the
appliance. The interlock must be placed on the driven member.
NOTE: It is very important to follow these instructions carefully to ensure proper performance of the louver.
1. The louver must not be close to the furnace. The fresh air should travel at least 40 to 50 feet before
reaching the furnace, so the air warms up. The furnace will not heat well if it is receiving cold return air.
2. The louver must be high in the sidewall of the building so the cold fresh air does not blow across the
floor level and chill the service personnel.
3. The louver should be installed in the opposite wall from the location of the exhaust fan. This
will quickly vent diesel exhaust from the top of the building and reduce the amount of run time
for the exhaust fan.
Installing a Make-up Air Louver (continued)
Calculated Opening Size
(Square Feet)
Required Louver / Grill Size
(Inches)
From 0.000 to 0.569
From 0.570 to 0.900
From 0.901 to 1.556
From 1.557 to 2.070
From 2.071 to 2.574
From 2.575 to 3.408
From 3.409 to 5.133
From 5.134 to 7.696
From 7.697 to 9.883
From 9.884 to 13.299
From 13.300 to 16.683
From 13.684 to 21.152
10 x 10
12 x 12
16 x 16
18 x 18
20 x 20
24 x 24
30 x 30
36 x 36
42 x 42
48 x 48
54 x 54
60 x 60
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