Greenheck Fan Centrifugal Roof Downblast Exhaust Fans GB - Manual (Page 10)

Options and Accessories
10
Roof Curbs
Prefabricated roof curbs reduce installation time and
costs by ensuring compatibility between the fan, the
curb and roof opening. All curbs are insulated with
fiberglass. A wide variety of roof curbs are available,
including: flanged, pitched and sound-absorbing.
Hinged Curb Cap with Cables (Field Installed)
Mounted to the curb cap, allows entire fan to tilt away
from curb for access to wheel and ductwork. Includes
restraint cables.
Hinged Base
(Factory Mounted)
Allows for easy
maintenance. Hinge and
restraining cables are
factory mounted to a
subbase attached directly
to curb without additional
height added.
Curb Seal
Rubber seal between fan and curb to assure proper
sealing when attached to a curb.
Curb Extensions
Extensions raise
the fan discharge
above the roofline
and provide an
accessible mounting
location for dampers.
Insect screen bases, constructed
with a removable fine mesh, are recommended for
applications where insect entry must be prevented.
High Wind and Severe Duty Roof Curbs
GPF/GPFP/GPFR – Approved for high wind
applications up to a 75 psf wind-load rating.
Constructed of 18 gauge steel, formed and welded
sides, and a 5-inch flashing flange. GPF is available
up to 42 inches in height. GPFP and GPFR are
available up to 24 inches in height.
Severe Duty Curbs – Designed for heavy
compression loads exceeding 1,000 lbs. and carry a
130 psf wind-load rating.
GPFHL (Heavy Load) - 14 gauge galvanized steel
with internal vertical support members and a 5-inch
flashing flange.
GPFHD (Heavy Duty) - 12 gauge galvanized steel
with internal vertical support members and a double
thick 5-inch flashing flange.
GPFHL and HD are available up to 24 inches in
height. Note: Maximum 24 inch height restriction on
all curb models certified for high wind.
For detailed curb information refer to Roof Curbs,
Extensions and Equipment Supports catalog.
Mounting details for the roof curb to the roof
substrate and the fan to the curb are included with
each model G and GB installation manual.
For additional severe duty information, refer to the
Greenheck High Wind brochure.
Tie-Down Points
Four brackets located on
the shroud for securing
the fan in high wind
applications. Cables and
anchors by others.