SECTION I. GENERAL DESCRIPTION

Contractor shall furnish and install the AAF-RPS self-contained, self-cleaning extractor and side-draft dust control panel per plans. The unit shall be an AAF-RPS as supplied by AAF International of Louisville, Kentucky, USA, or approved equal.

Each unit shall consist of a cabinet style filtration module, motor blower module, on/off control, compressed air manifolds, 1” diaphragm valves attached to blast nozzles. A 58”x58” baffled face dust control panel fitted with 13 ply spark arrestance panels complete the assembly. The AAF-RPS shall be completely factory assembed as a self contained unit. Each unit shall be neatly finished with hammer style, powder coat, thoroughly tested and properly packaged for shipping. The extractor precision sheetmetal fabriction shall be fabricated in an ISO-9001 compliant facility and the complete packaged unit shall bear the ETL/CSA label.

SECTION II. EXTRACTOR CAPACITY RATING

The capacity of each unit at nominal rating shall be to produce at least 4000 actual cubic feet per minute. Free air rating shall be at least 5500 cubic feet per minute airflow with new cartridges. Fan wheel is a 15” airfoil, backward inclined, non-overloading high efficiency spark resistant type. Motor shall be; 5 HP,  3450 RPM, 208v/13.2A, 230v/12.2A, 460v/6.1A, 575v/5.8A, 3 Phase 60HZ.

The primary filter cartridges are to be 100% spun bond polyester. Hydro Oleophobic (HO) treated polyester 80/20 cell/poly blend may also be used depending upon the application specification. The cartridges are 30”Hx 18”OD x14”ID. Spun bond polyester media is 99.9% efficient at .3 micron particulate size.

SECTION III. EXTRACTOR DESIGN AND SIZE

Extractor shall be of side-draft design with the baffled side-draft panel serving also as the filter cartridge and dust tray access door. The side-draft panel consists of 5 vertically arranged 58”x6” baffle slats with 1” 45° wings arranged 1 1/2” apart. A second row of 6 baffle slats is arranged back to back and staggered to create the airflow “eddy” sufficient for spark attenuation. A third line of tortuous path spark arrestance shall consist of (4) 24”x24”x2” thick panels with 10 ply of expanded aluminum mesh and 3 ply of tight woven steel screen interspersed. The aluminum mesh filters are rated to achieve 100% spark arrestance up to 700 FPM per 24”x24”x2” panel. Air enters the baffled side draft panels at 650 feet per minute face velocity.

The filter cartridges rest on a sloped blower transition plenum. Metal clamp down compression strips secure the cartridges to blower plenum. At the junction of the transition plenum and the base housing panel are four removable dust trays.

A minimum of four clear inches of space shall exist between the cartridge and the housing walls on three sides (better air flow distribution). A minimum of eight inches of space shall separate the cartridges (limit cross blasting of particulate).

The main extractor housing will have a minimum of 25 Sq. ft. of 1” thick class one acoustical lining. Total blower noise shall not exceed 78 DBA at 3ft. on the discharge side.

The extractor will make use of standard convection louvers in the side panels to enhance heat transfer away from the motor.

The Motor/Blower frame, panels and housing will be 12 ga. welded steel construction. The side panels are situated to provide access to two sides of the fan wheel motor, and electrical fittings.

The filter module housing and blower plenums shall be of 12 ga.

welded steel construction with a single hinged side-draft panel that is fitted with a compression gasket and will allow access to both cartridges and all four dust trays.

The reverse pulse assembly, consisting of the air manifolds, 1” diaphragm valves and blast nozzle shall be mounted to the sides and beneath the blower plenum with a diaphragm valve and blast nozzles directly below each cartridge.

SECTION IV. CONTROLS AND FITTINGS.

All junctions, connectors, leads, strain relief grommets, wiring and components are ETL/CSA recognized components.

Blower/Motor control shall be of the on/off operation type, and may include 115VAC step-down transformer for integral high intensity Large Lighted Hood (LHX). The motor starter shall be equipped with thermal overload and under voltage protection. Motor/Blower control box shall be panel mounted and so located on extractor to provide ease of servicing and use.

SECTION V. FILTER MODULE CONTROLS

A manual reverse pulse controller shall be installed behind the filter module and shall be of on/off type. An optional reverse pulse controller shall provide an automatic cleaning sequence of the filter cartridges. The cleaning process with the optional control is activated when the  ΔP set point is exceeded by the actual  ΔP value. When the set point is exceeded the controller activates the electric diaphragm valves according to a preset, constant pulse and interval time setting. A digital display shall indicate the preset filter module  ΔP set point value. The optional controller will also perform a final cleaning sequence upon shut down of the system.

SECTION VI. TEST

A QC inspection of the extractor shall include a physical inspection of the following:

1. Finish
2. Motor Mounts
3. Shaft
4. Key Way
5. Fan and Cone Alignment

Followed by a trial power-up to test the reverse pulse controller, motor/blower control, and direction of fan rotation. Finally a test of the acoustical lining for adhesive performance and a physical inspection of the primary filter cartridges for shipping damage, pleat seal, gasket seal, tears and/or pin holes.

SECTION VII. OWNER’S MANUAL

A. Instructions for installation, operation and maintenance of the extractor shall be contained in the owner’s manual provided with each extractor unit.

B. A wiring diagram corresponding to the  extractor
shall be included in the owner’s manual.

C. Instructions for operating the reverse pulse controller and the corresponding wiring diagram shall be contained in the owner’s manual provided with each extractor unit.

SECTION VIII. WARRANTY

The extractor shall have a one year (12 month) material and workmanship warranty. All other components are covered by a one year manufacturers (12 month) warranty.