HEIL F8MVL - Page 12

12
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place when side return air inlet(s) are used without a bottom
return air inlet.
Figure 12 − Furnace, Plenum, and Subbase Installed on
a Combustible Floor
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
A96285
Figure 13 − Furnace, Plenum, and Coil or Coil Casing
Installed on a Combustible Floor
APPROVED
COIL ASSEMBLY
OR
COIL BOX
FURNACE
SHEET METAL
PLENUM
FLOOR
OPENING
COMBUSTIBLE
FLOORING
A08556
Not all horizontal furnaces are approved for side return air
connections (See Figure 20)
Table 4 – Opening Dimensions − In. (mm)
FURNACE
CASING
WIDTH
IN. (mm)
APPLICATION
PLENUM OPENING FLOOR OPENING
A B C D
14–3/16
(360)
Upflow Applications on Combustible or Noncombustible
Flooring (subbase not required)
12−11/16
(322)
21−5/8
(549)
13−5/16
(338)
22−1/4
(565)
Downflow Applications on Noncombustible Flooring
(subbase not required)
12−9/16
(319)
19
(483)
13−3/16
(335)
19−5/8
(498)
Downflow applications on Combustible Flooring
(subbase required)
11−13/16
(284)
19
(483)
13−7/16
(341)
20−5/8
(600)
Downflow Applications on Combustible Flooring with Coil
END4X, ENW4X or Coil Casing NAEA (subbase not required)
12−5/16
(319)
19
(483)
13−5/16
(338)
20
(508)
17–1/2
(445)
Upflow Applications on Combustible or Noncombustible
Flooring (subbase not required)
16
(406)
21−5/8
(549)
16−5/8
(422)
22−1/4
(565)
Downflow Applications on Noncombustible Flooring
(subbase not required)
15−7/8
(403)
19
(483)
16−1/2
(419)
19−5/8
(498)
Downflow Applications on Combustible Flooring
(subbase required)
15−1/8
(384)
19
(483)
16−3/4
(425)
20−5/8
(600)
Downflow Applications on Combustible Flooring with Coil
END4X, ENW4X or Coil Casing NAEA (subbase not required)
15−1/2
(394)
19
(483)
16−1/2
(419)
20
(508)
21
(533)
Upflow Applications on Combustible or Noncombustible
Flooring (subbase not required)
19−1/2
(495)
21−5/8
(549)
20−1/8
(511)
22−1/4
(565)
Downflow Applications on Noncombustible Flooring
(subbase not required)
19−3/8
(492)
19
(483)
20
(508)
19−5/8
(498)
Downflow Applications on Combustible Flooring
(subbase required)
18−5/8
(473)
19
(483)
20−1/4
(514)
20−5/8
(600)
Downflow Applications on Combustible Flooring with Coil
END4X, ENW4X or Coil Casing NAEA (subbase not required)
19
(483)
19
(483)
20
(508)
20
(508)
24−1/2
(622)
Upflow Applications on Combustible or Noncombustible
Flooring (subbase not required)
23
(584)
21−1/8
(537)
23−5/8
(600)
22−1/4
(565)
Downflow Applications on Noncombustible Flooring
(subbase not required)
22−7/8
(581)
19
(483)
23−1/2
(597)
19−5/8
(498)
Downflow Applications on Combustible Flooring
(subbase required)
22−1/8
(562)
19
(483)
23−3/4
(603)
20−5/8
(600)
Downflow Applications on Combustible Flooring with Coil
END4X, ENW4X or Coil Casing NAEA (subbase not required)
22−1/2
(572)
19
(483)
23−1/2
(597)
20
(508)