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Accessory Description and RemarksAccessory Description and Remarks
Plywood Cold Water
Collection Basin
Pressure-treated Douglas fir plywood collection
basin for towers located above grade.
See page 11.
Bottom-Outlet Sump Square-plan galvanized steel sump with bottom
outlet. Outlet connection is a hole and bolt circle
conforming to 125# ASME pipe connection.
Includes a plugged drain connection in sump
bottom.
Additional Access
Door
Extra access door on single-cell towers
offers easy access through either endwall.
Wood Stairway Pressure-treated Douglas fir 45° stairway located
at tower endwall provides access to the fan
deck. Choose a stairway in place of one endwall
ladder, or use both ladders as well as the
stairway. Handrails and kneerails are standard,
so design conforms to OSHA standards.
Steel Ladder
Galvanized steel ladder conforms to OSHA
standards. May be in place of or in addition to
standard aluminum ladders.
Ladder Safety Cage
Galvanized steel circular framework, bolts
to ladder siderails and conforms to OSHA
standards. Cages extend from the top of the
guardrail to about 7’ above the base of the
ladder. If the tower fan deck is more than 20'
above roof or grade, OSHA requires safety cages.
Plenum Walkway Pressure-treated Douglas fir plenum walkways
extend the full length of the tower from access
door to access door above the water line.
Guardrails are optional. However, OSHA requires
guardrails if the walkway is 4'-0" or more above
the basin floor.
Ladder Extensions
Used when tower is elevated appreciably above
working level. Extensions attach to the normal
ladder and may require base anchorage
(depending on length).
Premium
Hardware
Choose from several corrosion-resistant
hardware options, providing different degrees of
protection.
Fire Protection
Sprinkler systems and overlay materials let you
choose from a range of fire protection options.
See page 10.
Redwood Fan Deck,
Distribution Basin, or
Tower Structure
You can choose redwood instead of Douglas fir
for any or all of these tower elements.
Interior tower columns can be extended to
permit concrete basin depth of up to 5’-6”.
Some exceptions apply, so consult your
Marley sales representative
Fan Cylinder
Extensions
Optional flared fan cylinder extensions improve
fan efficiency to reduce your operating costs.
Extensions on Sigma 1000 Series towers
conform to OSHA requirements without fan
guards.
Cell Partitions Extra partitions between fan cells for specific
operating considerations. See page 9.
Vibration Limit
Switch
Robertshaw or Metrix single-pole, double-throw
vibration switches in NEMA 4 housing. Double-
pole, double-throw models are also available.
Oil Level Sight Glass A brass-fitted oil level sight glass takes the place
of the dip stick on the external oil fill and drain
system. Permits easy reading of oil level and also
lets you change oil through the lube line.
Air Inlet Screens Galvanized wire mesh screens over the air inlets
keep leaves and trash out of the tower. Easily
removable. Choose either treated fir frames or
galvanized steel U-edge frames.
Plywood
Distribution Basin
Covers
Removable, treated fir plywood covers keep
upper basins free of leaves and debris. They
also tend to retard growth of algae by keeping
ultraviolet radiation away from the warm
water in the basins. Covers may be used as a
working surface for tower maintenance.
Extended
Columns for Deep
Collection Basin