Page 19
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 mm) static pressure.
1.
Make-up air from outside the building may enter enclosure from top or
side walls.
(See Dryer Make-Up Air Requirements Chart)
2.
Use constant diameter duct with area equal to the sum of dryer duct areas.
EXAMPLE:
Six 8 inch (204 mm) diameter ducts = one 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/hr (6.3 kcal/hr) for each cubic foot per minute
(cfm) used.
4.
The installation clearance from all combustible material is 0" ceiling
clearance for the first 4" (102 mm) from the front of the dryer. After the
first 4" (102 mm), the ceiling clearance required is 6" (153 mm). the rear
clearance required is 0", and the side clearance is 1" (26 mm).
5.
Heat loss into laundry room from dryer fronts
only
is about 60 Btu/hr per
square foot (15 kcal/hr 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 or m³/min.) is equal to the sum of dryer air flows, but static
pressure (SP) is dependent on length of pipe and number of elbows.
7.
Barometric Bypass Damper—Adjust 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
E X H A U S T