Honeywell 11255 Application Guidelines, VAV Systems, Hospital Applications, Gasketed Headers

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 downstr am side of the supply fan in hospitals if th y a far enough from the fan so that the high fan discha ge velocity will not affect them. Rigid-Air igid filte s can withstand adverse air flow c nditi ns better than bag filters and are the preferred selecti n for these applications.

Gasketed Headers

Rigid-Air headered filters in talled 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 he ders, dd suffix “S” or “H” to the model number. Ex mple:

Model Number - S: G skets are on the sides paral- lel to the pleats.

Model Number - H: Gaskets are on the sides per- pendicular to the pleats.

Guide Specifications

1.0 General
1.1 Medium and high efficiency self-supporting filters		the air entering side if required by the applica-
		tion.
shall be Rigid-Air lofted fiberglass or micro-fine
synthetic media rigid filters as manufactured by		2.4 The filter pack shall be sealed into a 24 ga.
Flanders.		corrosion-resistant steel casing with metal or
1.2 Filter sizes, efficiencies and capacities shall be		plastic pleat separators on the upstream and
		downstream sides to maintain pleat configura-
as scheduled on the drawings.
		tion.
2.0 Filter Construction		3.0 Performance
2.1 Filters shall be cons ruc ed of lofted micro-fine
		3.1 Initial and final resistances shall not exceed the
fiberglass or m cro-f ne synthetic media laminat-
		scheduled values.
ed to a non-woven backing, bonded to an
expanded metal wire grid and pleated to form the		3.2 Media area must equal or exceed that of the
filter pack		specified filter.
2.2 The filter pack shall be strengthened on the air		3.3 The average efficiency shall be as determined by
nt	ring and air exiting sides with horizontal and	the ASHRAE Standard 52.1 test methods.
diagonal m tal support members.		3.4 The manufacturer shall guarantee performance
2.3 The	nclosing frame shall be assembled in a	as stated in its literature within tolerances as out-
rigid manner and shall incorporate a header on		lined is Section 7.4 of ARI Standard 850.

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