Honeywell 11255 manual Save In-LineSpace, Save Storage Space and Shipping Costs, HEPA Prefilters

Prefilters

Prefilters are always a wise choice for the protec- tion of minipleat filters no matter what the efficiency or brand. The closely-spaced pleats are subject to face-loading (bridging) by lint and coarse particles, thus reducing their usual long life. A minimum 25- 30% ASHRAE efficiency pleated panel filter such as the Flanders Prepleat 40 is recommended.

Save In-Line Space

Compare the airway lengths of 22” PrecisionPak bag filters and 12” Rigid-Air filter to a 4” PrecisionCell filter when they are installed with 2” prefilters.

VAV Systems

Filter banks should be sized so that the face veloc- ity at maximum design conditions is 625 fpm or less. PrecisionCell II filters may be applied at any capacity between 0 and 625 fpm. Operating a filter bank at reduced flow will greatly increase xp ct d filter life.

Save Storage Space and Shipping Costs

Using the 24” x 24” size as an example, a carton of four PrecisionCell II 4” filters has a v lume of 5.3 cubic feet and a weight of 26 lbs. C mpare this to four 12” deep rigid separator- ype fil ers packed in four cartons with a total volume of 16 cubic feet and total weight of 80 lbs.

Type 9 Frame with PrecisionPak and Pre Pleat 40

Type 9 Fr me with PrecisionCell II nd PrePle t 40

Sureseal Housing with 12” Rigid-Air and PrePleat 40

Surepleat Housing with PrecisionCell II and PrePleat 40

Application Guidelines

PrecisionCell II filters should be s l cted for new installations with 24” H x 24” W and 24” H x 12” W face sizes. These are he most widely used and stocked sizes. Th s a ows for 12” increments in height and width of the f ter bank and insures that replacement cartr dges w ll be readily available.

PrecisionCell II ilters should be installed with the pleats vertical wherever possible. It is permissible to install 24” H x 12” W face size filters with pleats horizontal if n c ssary to meet the size require- ments of the filt r bank.

HEPA Prefilters

PrecisionCell II filters are ideal as prefilters for Alpha Cell HEPA filters. Their light weight and 4” depth make them an excellent choice for installa- tion in the optional Prefilter Frame Assembly for the Alpha Cell HEPA Filter Holding Frame or in Surelock Side Access HEPA Housings.

Specify the Surelock housing with an optional 4” wide prefilter track for the PrecisionCell II filters, in lieu of the 2” wide prefilter track for pleated panel fil- ters. We recommend the selection of 80-85% PrecisionCell II filters as HEPA prefilters.

Flanders - Foremost in Air Filtration

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