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Air Filters and Cleaners Coppus Engineering Corporation 339 Park Avenue, Worcester, Mass. MANUFACTURERS OF AIR FILTERS, STEAM TUR BINES, FORCED DRAFT BLOWERS, COOLING FANS Coppus Unit Filter Coppus Unit Filter--The Coppus Unit Filter is of the dry type using a removable filter glove of all-wool felt and sup ported by a rigid, welded distender frame which is adjustable so that after assembly the filter glove may be stretched and held tautly inside of the filter casing, giving the pockets a tapered shape so essential for an even air flow. All metallic parts are riist-proofed (Bonderized, Cadmium Plated),' and Duco painted. Specifications Normal Rating: 800 cfm. Resistance when clean: .2 in. W.G. Dust Arrestance (cleaning efficiency): 99.61 per cent (Tested in accordance with A.S.H.V.E. Standard Code for Testing and Rating Air Cleaning Devices Used in General Ventilation Work). Dimensions:. 20 in. by 20 in. by 6H inWeight per unit: 25 lbs. Outstanding Advantages 1. It has an exceptionally high dust arrestance. 2. It maintains a high dust arrestance even under diverse conditions of neglect. 3. Its operation is not impaired by atmospheric conditions. 4. It is a Medium Air Resistance Type (Class C) according to the A.S.H.V.E. Code for Air Cleaning Devices. 5. It is easily and quickly cleaned without removing the filter element. Cleaning Fitter Ele ments with Portable Vacuum Cleaner 6. Its cost of upkeep is very low because the permanent filter element is reconditioned periodically with a vacuum cleaner. 7. It combines scientific knowledge and.practical engineering methods with highest quality of material and workmanship. Coppus Dry-Matic Filter Automatic SelfCleaning DryType Air Filter --It uses a spe cially woven cotton textile as. filter medium arranged in the shape of an endless belt in zig zag fashion over rolls. The hori zontal pockets have a tapered shape, thus securing an. even rate of air flow over the. whole effective filter area. At pre determined intervals the filter curtain is automatically -moved by a small geared motor over the rolls, thus passing over a suction nozzle. For certain types of dust the filter is also equipped with a beater which, at predetermined intervals, auto matically reconditions the filter curtain. The cleaning and reconditioning operation takes place while the ventilating system is in operation. Built in capacities from 2000 cfm up. Coppus Window Air Filter It supplies a continuous flow of filtered air, is extremely quiet in operation, keeps out street noises, eliminates dirt and dust including invisible particles, and last, but not least, is very effective against rag weed pollen [ in concentrations _______ ___ commonly found FL 1 Wira in the hay fever M I! BHBfiMPseason. Its use ;s recommended * for offices, homes and hospitals. Air Filters for Compressors and In ternal Combustion Engines. Steam Turbines, Horizontal and Vertical, 1 to 150 Hp. Forced Draft Blowers. Portable and Cooling Ventilating Fans. 852 Air Filters Independent Air Filter Co. 215 West Ohio Street, Chicago "DOUBLE DUTY" An Air Cleaner That Cleans Itself--and Never Clogs Three Section Group, 9 ft. S in. high bp 9 ft. 0 in. unde, capacity 30,000 c'f.m. "Double Duty ' filters made in capacities from 3000 to 600,000 c.f.m. This type especially adapted for large installations, where automatic oper ation and unvarying air flow are im portant factors. The filtering principle is that of true impingement on viscous coated metal surfaces. Endless filter curtain-composed of die stamped steel plates, heavily indented, and disposed in overlapping form. Acute deflections of individual fins, constantly coated with heavy oil, result in high cleaning efficiency. Entirely self-cleaning, re-, gardless of dust content of air. Self draining design of curtain plates elimi nates all danger of oil entrainment. "KOMPAK" A Low Velocity, Dry. Fabric Air Filter--With Renewable Medium Cross-section through fitter. Sludge is removed at in tervals oftwo to six months. Oil consumption negligible --never changed; merely replenished For general ventilation and industrial air clean ing. Filtering principle that of straining air through fabric material at low velocity. Standard filter medium high grade, fluffy cotton material, with high cleaning efficiency and remarkable dust hold Note easy method of detaching unit from frame. Improved style locking device clamps felt seal firmly against main frame ing capacity. Each unit contains 27 sq. ft. of filter medium, which, at normal rating of 600 c.f.m., results in velocity of 22)4 f-p.ni. through Method of Servicing Entire - operation--unloading, re filling and replacing--consumes at most S minutes per unit. Useful life of fitter medium varies from three to six months, depending on conditions medium. Initial resistance 0.15 in. W. G. Frame installation. No pad container necessary. Only the pad is throum away HAIR PAD A High Grade, Low Cost Air Filter Filter medium composed of Keratin fibre (animal hair) thoroughly sterilized, making it sanitary and odorless. Fabricated with progressive density into a self-supporting pad of great resiliency. Oil treated to increase cleaning efficiency and dust holding capacity. For ventilating and air conditioning systems frames are made standard size 20 in. x 20 in. x 4)4 in. (overall) rated at 800 c.f.m. per unit. Initial resistance with pads in double formation 0.12 W. G. 853 For warm air heating systems and air condition ing units pads are made in three standard sizes, SO x SO, 16 x S5 and 16 x SO. Special sizes, any shape, cut to order