Page 21
Dryer Installation with Multiple Exhaust
For Exhaust Duct more than 14 feet (5 m) and 2 elbows equivalent and more
than 0.3 inches (.8 mbar) static pressure. (See illustration on page 21.)
1. Make-up air from outside building may enter enclosure from top or side walls.
(See Dryer Make-Up Air Chart on page 22)
2. Use constant diameter duct with area equal to the sum of dryer duct areas.
EXAMPLE:
Six 8 inch (204 mm) diameter ducts = one (1)
19.6 inch (498 mm) diameter duct in area. Use 20 inch (508 mm) diameter duct
or diameter to match tube-axial fan.
3. Enclosure (plenum) with service door. This separates the dryer air from room
comfort air. If dryers use room air instead of outside air, the heat loss can be
another 25 Btu/h (6.3 kcal/h) for each cubic foot per minute (cfm) used.
4. Zero inches clearance to combustible material allowed on sides and at points
within 4 inches (102 mm) of front on top.
5. Heat loss into laundry room from dryer fronts
only
is about 60 Btu/h per square
foot (15 kcal/h per 0.1m²).
6. Flange mounted, belt driven tube-axial fan. Fan must run
when one or more
dryers are running.
See suggested Automatic Electrical Control Wiring
Diagram on previous page.
Must meet local electrical codes. Fan air flow
(cfm) (m³/min.) is equal to sum of dryer air flows, but static pressure (SP) is
dependent on length of pipe and number of elbows.
7. Barometric bypass damperadjust to
closed flutter position
with all dryers
and exhaust fan running. Must be located within enclosure.
CAUTION:
Never
install hot water heaters or other gas appliances in the
same room as dryers.
Never
install cooling exhaust fans in the same room
as dryers.
CAUTION:
Never
exhaust dryers with other types of equipment.
DRYER INSTALLATION
WITH MULTIPLE EXHAUST
