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The feature that differentiates a Direct Gas-Fired Heating System from other types of heating equipment is its burner system. A “trough” or “line” burner is installed directly in the supply air stream. Combustion products are introduced into the building space during operation.Direct Gas-Fired Air Heating Systems are a class of equipment utilized primarily in industrial and commercial environments to provide for worker comfort. To a lesser extent, these systems are used to condition air for process and finishing applications such as material drying and paint curing.These systems have gained widespread use due to the fact that they are inexpensive to build, maintain, and operate compared to other furnace types of comparable heating capacity.The key advantages are simplicity and efficiency. No heat exchanger is required. This eliminates component installation and maintenance costs. With no heat transfer losses, the unit is nearly 100% efficient.The primary disadvantage is the introduction of waste products into the airstream. For this reason, both ANSI Z83.4/CSA3.7 and ANSI Z83.18 standards state: “Heaters covered by this standard are intended for use in industrial and commercial applications.” ANSI Z83.18 states further that: “Heaters covered by this standard are not intended for use in any area containing sleeping quarters." Carbon Monoxide and Nitrogen Dioxide are the primary pollutants. These are limited to no more than 5.0 PPM for CO and 0.5 PPM NOX, a fraction of OSHA allowable Permissible Exposure Limits (PEL’s).A Direct Gas-Fired Air Heating System may be used in an industrial or commercial application for any or all of the following purposes:* Make-Up Air Heating – Air is introduced to a building to replace air being exhausted.* Space Heating – A unit provides primary or supplementary heating to a building space.* Space Pressure Control – Building or Room Pressurization is held within a range.There are three general applications for Make-Up Air Units:- Direct Compensating Ventilation- General Area Ventilation- Door HeatingDirect Compensating Ventilation.Conditioned Air is Delivered to the Immediate Vicinity of Exhaust. This is the case for welding fume extractors, stovetop exhaust hoods, paint booths, or similar applications.General Area Ventilation. Conditioned Air Blankets Entire Area of Building to Compensate for Many Exhausts. Introduced in Cleanest Part of Building - Flows to Negative Pressure Areas - Picks up Dust, Vapors, and Odors en route.Door HeatersHeated Air is introduced at open doors to warm incoming air or compensate for loss. Heater may also be used as part of an “air door” system.Typical Industrial Uses:* Plating Tanks* Paint Spray Booths* Welding Operations* Chemical Exhaust* Degreasing* Factory Ventilation* Plastic Molding* Foundry Works* Grinding & Buffing OperationsTypical Commercial Uses:* Warehouses* Kitchens* Entryways* Gymnasiums* Pools* Exposition Buildings* GaragesAdditional information can be found at the ABB Blower company web site http://www.abbblower.comSusanna TerlitskiDesigner of Industrial Air Handling UnitsABB Blower [email protected]://ventilating.comhttp://fanblower.comhttp://highpressureblower.nethttp://industrialblowerfan.comhttp://industrialfanblower.nethttp://industrialfanblower.comhttp://pressureblower.nethttp://northernindustrialsupplycompany.comhttp://industrialpressureblower.comhttp://tenderall.comhttp://chicagoblowercanada.comhttp://cbblower.comhttp://buffaloblower.comhttp://buffalofan.comhttp://nis-co.comhttp://canadianblower.comhttp://olegsystems.comhttp://canadablower.comhttp://abbblower.comhttp://acmefan.nethttp://industrialblower.nethttp://fansandblowers.nethttp://americanblower.nethttp://barryfan.comhttp://cincinnatifan.nethttp://barryfan.net
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