UL De 30 Manual De Instrucciones Para La Instalación, El Uso Y El Mantenimiento página 6

Installing the Ductwork
Use galvanized or aluminum duct in 6" round or 3½"
x 10" size, or a combination of both. PVC duct should
be used if installing under a poured concrete slab.
Use the shortest and straightest duct run possible.
For satisfactory
performance,
the duct run should
not exceed 100 feet equivalent length. Refer to the
"Calculating Duct Length" chart for equivalent lengths.
(see page 14). All duct joints should be fastened with a
screw and sealed with tape as shown in Figure 5.
NOTE: Local building code must be followed in
specifying approved type and schedule of ALL duct
used. Always use an appropriate roof or wall cap with
damper.
Duct Tape
Over Seam
and Screw
!
Figure 7 - DUCT THROUGH-THE-FLOOR
Screw
Figure 5 - DUCT TAPE OVER SEAM AND SCREW
° '. ° I["'
Figure 6 - DUCT ON-THE-FLOOR
Figure 8 - DUCT THROUGH-THE-WALL