OPEL 2000
30
noise reduction collars
alternate blower location
2-5
6 diameter runs
zero clearance
blower
3-5
5 diameter runs
back draft
damper
59 min.
Figure 29: Central heat location options
B vent pipe
4 min.
duct is to be connected to the return air of another cen-
tral heating system.
6. Connect the INLET of the blower to the ducting coming
from the fireplace, using 8 diameter metal ducting (rigid
or flex). Any other size will not work properly. Use only
metal ducting between the fireplace and the blower. You
may use plastic ducting after the blower, provided the
temperature rating of the ducting is at least 250° F. Do
not use plastic ducting in a chase.
Note: The central heat ducting may be run at a 0 clea-
rance to combustibles.
7. To install the blower (for the FD-HB6 only): attach
the noise reduction collars to either side of the blower
using 1/2 self-tapping screws.
8. Ductwork can then be run to the desired rooms. Up
to six 5" or five 6" diameter runs can be installed from
this system.
Note: Runs must be balanced as air travels along the
path of least resistance. Balance the airflow by diameter
and length of runs. Longer runs should have larger
diameters. Houses vary in size and layout, so duct
systems must be specifically designed for each home.
The diagrams on this sheet are examples only. The cross
sectional area of the distribution system must total at
least 50 square inches. If you have more than 50 square
inches, some of the system may be shut off, but there
must always be 50 square inches of ducting open at all
times. For example, if 5" pipe is used for distribution,
the cross section of each is 20 square inches. The mi-
nimum allowable ducting would be three runs of 5" pipe.
Figures 27 & 28 illustrate two examples of tying-in to
existing ductwork. Directing air in the right direction will
reduce reverse flow when the existing furnace blower is
off. Some reverse flow will not cause any problems
Summary of Contents for OPEL 2000
Page 40: ...OPEL 2000 40 ...
