Precisionaire Pak XDH manual Guide Specifications

Application Guidelines

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

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

VAV Systems

VAV systems can be designed using the full range depth of Precision Pak XDH filters. Filter banks should be sized so that the maximum rated flow at design conditions falls within the published recom- mended velocities. Precision Pak XDH filters in all standard depths can be applied at any capacity between zero flow and catalog-rated capacities.

Installation Considerations

Precision Pak XDH bag filters may be installed in Flanders Astr Holding Frames, K-Trac Filter Framing Modules, Sureseal Side Access Housing or in similar existing hardware.

Astr Holding Frames are riveted together to form a bank and may be installed for upstream or down- stream service. K-Trac Filter Framing Modules are especially suitable for medium to large built-up filter banks. Smaller systems and systems with minimum upstream access space are best served using Sureseal Side Access Housings.

Gasketed Headers

Precision Pak XDH filters installed in Flanders K-Trac Filter Framing Modules or Sureseal Side Access Housings require polyfoam gaskets on opposite head- er sides to prevent air bypass.

To specify Precision Pak XDH filters with gasketed headers, add suffix “S” or “H” to the model number. Use “S” gaskets on the sides parallel to the pockets and “H” for gaskets on sides perpendicular to the pockets.

Prefilters

Properly selected bag filters without prefilters will gen- erally require changeout annually in typical HVAC applications. Because of the frequent maintenance expense and increase in fan kW input using prefilters, they are seldom recommended on lower efficiency final filters.

	Guide Specifications
1.0 General		2.4 Pockets shall be bonded to galvanized steel cas-
1.1	Medium and high efficiency self-supporting fil-		ings and assembled into a galvanized steel
			header with reverse-hemmed edges for safety.
	ters shall be Precision Pak XDH extended sur-
	face type as manufactured by Flanders.	2.5	Headers shall be gasketed with polyfoam on
1.2 Filter sizes, efficiencies and capacities shall be			vertical sides to prevent leakage when installed
			in framing modules or Side Access Housings.
	as scheduled on the drawings.
2.0 Filter Construction		2.6	Filters shall be UL 900 Class 2 listed.
2.1 Filters shall be constructed of polyolefin micro-		3.0 Performance
	fine synthetic media encased in a thin non-	3.1	Initial and final resistances shall not exceed the
	woven polyester backer mat.		scheduled values.
2.2 Open area on the filter face for air passage shall		3.2	Media area must equal or exceed that of the
	be not less than 90%.		specified filter.
2.3 Flexible internal support stitching shall maintain		3.3	The average efficiency shall be as determined
	individual pockets in a controlled form under all		by the ASHRAE Standard 52.1 and 52.2 test
	rated air flow conditions. Stitching shall be		methods.
	sealed with thermoplastic resin. Edges shall be	3.4	The manufacturer shall guarantee performance

finished with a four-thread overlock stitch to pre-	as stated in its literature within tolerances as
vent air bypass.
	outlined is Section 7.4 of ARI Standard 850.

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