FC2500 Furnace Installation and Operation Manual
5.1.2 Adjustable height of the plenum When the ceiling height, measured from the floor, is lower than 78 1/4’’ (1990 mm), it will be possible to cut the plenum extension (A) of at most 10" (254 mm). The plenum extension (A) must therefore have a minimum height of 15 1/2'' (393 mm). Warning : The plenum extension (A) should not obstruct the openings for the hot air distribution of the plenum (B) . The shaded area represents the maximum cutting of plenum extension (A) .
5.1.3 Adjustable height of the plenum (A and B); without cutting 73 1/4" to 88" (1860 to 2240 mm). For ceiling height from 78 1/4" (1990 mm) to 93’’ (2362mm) and more.
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