12
Duct Location
Backwall
1.
See Figure 15. Locate studs in wall.
2.
Measure and cut an opening for thimble as
illustrated in figure below. Cutout should be 6
1
/
8
-inch
diameter circle.
A
B
A—8 inches
B—4
5
/
16
inches
Figure 15
3.
Ducting is completed in
Duct Connection section.
Floor
1.
See Figure 16. Locate studs in floor.
2.
Measure to locate center of floor duct location. See
figure below.
A
B
A—10
7
/
8
inches
B—13
1
/
8
inches for installation with counter top or
backsplash behind range. 11
5
/
8
inches for
installation without counter top or backsplash
behind range.
Figure 16
3.
Cut an opening for floor transition piece as illustrated
in figure below. Cutout should be 7
1
/
4
x 7
1
/
4
inches
square. If opening is not correctly aligned, duct does
not connect properly.
4.
Ducting is completed in
Duct Connection section.
Duct Length
Ducting design is in terms of maximum length of straight
metal duct. To ensure proper air movement, limit fittings,
other than straight, to 50% of total duct length.
Maximum allowable calculated duct length is 60
equivalent feet.
• Use
Duct Length Piece Equivalents section to
calculate duct length.
• Flexible duct is not recommended because it can
create a fire hazard. However, if it is used, one foot of
flexible duct is equal to two feet of smooth metal duct.
