Honeywell 11255 - Manual (Page 52)

52
Application Guidelines
Rigid-Air filters may be used wherever job require-
ments and available space will accommodate 6” or
12” deep filters.
Rigid-Air filters should be selected using 24” x 24”
and 24” x 12” face sizes. This allows for 12” incre-
ments in height and width of the filter bank and
insures that replacement cartridges will be readily
available.
Rigid-Air filters should be installed with pleats ver-
tical wherever possible. It is permissible to install
24” x 12” face size cartridges with pleats horizontal
if necessary to meet the size requirements of the
filter bank.
VAV Systems
Filter banks should be sized so that the maximum
rated flow at design conditions falls within the pub-
lished recommended velocities. Rigid-Air filters
may be applied at any capacity between zero flow
and cataloged capacities.
Hospital Applications
Rigid-Air filters may be used on the downstream
side of the supply fan in hospitals if they are far
enough from the fan so that the high fan discharge
velocity will not affect them. Rigid-Air rigid filters
can withstand adverse air flow conditions better
than bag filters and are the preferred selection for
these applications.
Gasketed Headers
Rigid-Air headered filters installed in Flanders K-
Trac Filter Framing Modules or Sureseal Side
Access Housings require gaskets on opposite
header sides to prevent air bypass.
To specify headered version Rigid-Air filters with
gasketed headers, add suffix “S” or “H” to the
model number. Example:
Model Number - S: Gaskets are on the sides paral-
lel to the pleats.
Model Number - H: Gaskets are on the sides per-
pendicular to the pleats.
1.0 General
1.1 Medium and high efficiency self-supporting filters
shall be Rigid-Air lofted fiberglass or micro-fine
synthetic media rigid filters as manufactured by
Flanders.
1.2 Filter sizes, efficiencies and capacities shall be
as scheduled on the drawings.
2.0 Filter Construction
2.1 Filters shall be constructed of lofted micro-fine
fiberglass or micro-fine synthetic media laminat-
ed to a non-woven backing, bonded to an
expanded metal wire grid and pleated to form the
filter pack
2.2 The filter pack shall be strengthened on the air
entering and air exiting sides with horizontal and
diagonal metal support members.
2.3 The enclosing frame shall be assembled in a
rigid manner and shall incorporate a header on
the air entering side if required by the applica-
tion.
2.4 The filter pack shall be sealed into a 24 ga.
corrosion-resistant steel casing with metal or
plastic pleat separators on the upstream and
downstream sides to maintain pleat configura-
tion.
3.0 Performance
3.1 Initial and final resistances shall not exceed the
scheduled values.
3.2 Media area must equal or exceed that of the
specified filter.
3.3 The average efficiency shall be as determined by
the ASHRAE Standard 52.1 test methods.
3.4 The manufacturer shall guarantee performance
as stated in its literature within tolerances as out-
lined is Section 7.4 of ARI Standard 850.
Guide Specifications
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