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Designers of welding fume and smoke fan / blower ventilators, air
compressure blowers, high temperature industrial air exhaust systems,
conveyor dust collectors, heat treating conveyorized ovens and dryers
for industry, custom build air dryer fans, industrial vacuums and
pneumatic conveyors, air and gas dryer ventilators, cyclone and bag
dust collectors, industrial cartrige dust collectors, air cyclones,
food oven conveyors and dryers, stainless steel blower & fan
systems.
Direct Gas-Fired
Heating Systems may be built in a number of configurations. They may be
curb mounted as horizontal rooftop systems with down or horizontal
discharge or in a vertical configuration for mounting on a pad outside
of a building, with air ducted to the interior. They may also be
located inside a building, suspended from hangers or mounted on support
steel. Various manufacturers can supply any physical configuration
required. Two air flow configurations are available: 100% Fresh Air or
Recirculating. In the 100% Fresh Air arrangement, air is heated as it
passes through the unit and supplied to the building space. In the
Recirculating arrangement, a damper is installed to allow a portion of
building air to be supplied to the unit and returned to the building.
This air is usually introduced downstream of the burner in a
pull-through unit. Various percentage settings are available: 80%
return / 20% fresh, 50/50, or variable. Typical components, options and
accessories are listed below:
Mounting Curbs:
For installation on building roof. Note – As a service, some
manufacturers will also specify mounting requirements for fabrication
by others. This allows a contractor to field fabricate a curb for
faster installation or allows for third-party fabrication of curbs
where the engineer specifies seismic-resistant construction.
Inlet Hoods:
Generally an add-on item. Prevents rain and trash from being drawn into
a unit.
Filters:
Filtration may be accomplished using Cleanable Filters mounted in the
Inlet Hood or by using a Flat or V-bank Filter Section. For special
applications, Bag Filters or HEPA final filters may be specified, but
these are not common.
Clogged filter switches and indicators are often supplied to alert
maintenance personnel when filters are dirty.
The airflow through the rig is determined by measurement of the
pressure differential and simultaneous readings are taken of the static
pressure developed by the fan, air velocity at the exit side, power
consumed by the fan driving motor etc.
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