Rigid-Air
Spun Glass or Synthetic Media Rigid Filter
Bulletin PB1001-1106
General
The headered version should be selected for use
with the hardware listed. If the filter is to be installed
so that it protrudes upstream of the holding frame,
the box style filter is required.
Rigid-Air extended media surface rigid filters are
designed for use in most commercial or industrial
HVAC systems where medium to high efficiency
filtration is required.
Physical Data
They feature your selection of media backed with
expanded metal and pleated. The pleats are held
in place by rigid pleat separators, available in either
plastic or metal styles on 12"depth filters. 6" depth
filters feature rugged fiberboard separators. Rigid-
Air is available in two media types: lofted fiberglass
and micro-fine synthetic with average efficiency
ranges of 50-55%, 60-65%, 80-85% and 90-95%
perASHRAE Standard 52.1 and MERV 10-14 per
ASHRAE Standard 52.2.
Frame: 24 ga. corrosion-resistant steel
doubleturned flange makes a stronger frame.
Media: Lofted fiberglass or micro-fine synthetic.
Media Supports: Expanded metal grid with metal
or plastic pleat separator.
Face Grid: Horizontal and diagonal metal supports.
Header: 13/16" wide 26 ga. corrosion-resistant
steel.
Operating Limits: 180° F 100% RH%.
These filters are especially suitable for variable air
volume systems. Operating face velocity ranges
are from 0 to 375 fpm for 6" deep filters, and from
0 to 675 fpm for 12" deep filters. Two frame styles
are available: a single header model and a box type
without header. Rigid-Air filters are UL900 Class 2
listed. Optional Class 1 listed are available with
metal inserts and fiberglass media.
Actual Header or Box Filter Face Size: Nominal
size less 5/8" (e.g., a nominal 24" x 24" filter is
actually 23 3/8" x 23 3/8").
Actual Depth: 5-7/8" or 11-1/2".
Installation Considerations
Rigid-Air filters may be installed in Astr Holding
Frames, K-Trac Filter Framing Modules, Sureseal
Side Access Housings or in similar existing
hardware.
Important Features
• Ecologically advanced filtration medium made
entirely from recycled materials.
• Rugged corrosion-resistant steel casing minimizes
damage during shipping and handling.
• Lofted fiberglass micro-fine or synthetic media is
held in position by upstream and downstream
plastic or metal pleat supports.
• Units are available with or without header.
• Filters are completely rigid.
• MERV 10-14
Flanders PrecisionAire ~ Foremost in Air Filtration
Toll Free: 1-800-637-2803
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Corrosion Resistant Steel Frame
Double Turned flange
for a stronger frame.
• 5-7/8" or 11-1/2"
depths
Choice of media
Lofted fiberglass or
micro-fine synthetic
• Available with or
without header
• Class 1 available
with glass media
and metal fingers.
Diagonal support
prevent racking.
Robust Media Support
Expanded metal pleat
backng and choice of metal
or plastic pleat supports.
Rigid-Air Box Type Filter
With Metal Pleat Separators
Rigid-Air Filter with Header and
Plastic Pleat Separators
Flanders PrecisionAire ~ Foremost in Air Filtration
Toll Free: 1-800-637-2803
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Application Guidelines
Hospital Applications
Rigid-Air filters may be used wherever job
requirements 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" increments in height
and width of the filter bank and insures that
replacement cartridges will be readily available.
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.
Rigid-Air filters should be installed with pleats vertical
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.
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.
VAV Systems
To specify headered version Rigid-Air filters with
gasketed headers, add suffix “SA” (side access),
“GU” (upstream), “GD” (downstream) and “GS”
(sides) to the model number.
Filter banks should be sized so that the maximum
rated flow at design conditions falls within the
published recommended velocities. Rigid-Air filters
may be applied at any capacity between zero flow
and cataloged capacities.
Guide Specifications
1.0 General
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
configuration.
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 Precisionaire.
1.2 Filter sizes, efficiencies and capacities shall be
as scheduled on the drawings.
3.0 Performance
3.1 Initial and final resistances shall not exceed the
scheduled values.
2.0 Filter Construction
2.1 Filters shall be constructed of lofted micro-fine
fiberglass or micro-fine synthetic media
laminated to a non-woven backing, bonded to
an expanded metal wire grid and pleated to form
the filter pack.
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 Filter shall meet MERV 10-14 as determined
by ASHRAE Standard 52.2 test standards.
2.2 The filter pack shall be strengthened on the air
entering and air exiting sides with horizontal and
diagonal metal support members.
3.5 The manufacturer shall guarantee performance
as stated in its literature within tolerances as
outlined is Section 7.4 of ARI Standard 850.
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 application.
3.6 Filters to be UL 900 Class 2 or 1 listed.
Representative
Flanders ~ PrecisionAire
Foremost inAir Filtration
Toll Free 1-800-637-2803
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