Honeywell 11255 manual Application Guidelines, Gasketed Headers, Prefilters, Guide Specifications

Application Guidelines

Precision Pak filters should be selected using 24” x 12” face sizes. This allows for 12” increments in height and width of the filter bank and insures that replacement filters will be readily available.

Housings require polyfoamgaskets on opposite header sides to prevent air bypass. To specify Precision Pak filters with gasketed headers, add suffix ”S” or “H” to the model number.

Precision Pak filters should be installed with pockets vertical wherever possible. It is acceptable to install 24” x 12” face size filters with pockets horizontal if necessary to meet the size requirements of the filter banks.

Gasketed Headers

Precision Pak filters installed in Flanders K-Trac Filter Framing Modules or Sureseal Side Access

Prefilters

Properly selected bag filters without prefilters will generally require changeout annually in typical HVAC applications. Because of the frequent main- tenance expense and in rease in fan kW input using prefilters, they are often re ommended with 85% and 95% efficient Precision Pak final filters. However, the energy cost to operate a prefilter sel- dom warrants their use with 55% or 65% filters.

Guide Specifications

1.0 General	2.4 Pockets shall be 100% stake-through crimped to
1.1 Medium and high efficiency self-supporting filters	prevent media pull-out
shall be Precision Pak extended su face type as	2.5 Pockets shall be bonded to corrosion-resistant
manufactured by Flanders.	steel casings and assembled into a corrosion-
1.2 Filter sizes, efficiencies and capacities shall be	resistant steel header.
as scheduled on the drawings.	2.6 Filters shall be UL 900 Class 2 or Class 1 listed.
2.0 Filter Construction	3.0 Performance
2.1 Filters shall be cons ruc ed of lofted fiberglass or	3.1 Initial and final resistances shall not exceed the
micro-fine synthet c media encased in a thin non-	scheduled values.
woven polyester backer mat.	3.2 Media area must equal or exceed that of the spec-
2.2 Open area on the ilter face for air passage shall	ified filter.
be not less than 90%.	3.3 The average efficiency shall be as determined by
2.3 Flexible internal support stitching shall maintain	the ASHRAE Standard 52.1 test methods.
individual pockets in a controlled form under all	3.4 The manufacturer shall guarantee performance
rat d air flow conditions. Stitchings shall be
	as stated in its literature within tolerances as out-
s al d with thermoplastic sealant. Edges shall
	lined is Section 7.4 of ARI Standard 850.
be finis ed with overlock stitch to prevent air
unravelling.

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