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From left to right, seen outside the Fast trio of adjoining buildings: a Farr Gold Series GS8 dust collector installed in 2009 to tackle weld fumes; a GS16 installed in 2011 that captures laser-cutting dust and fumes; and a GS6 installed in 2012, also for laser-cut- ting fumes and dust.
cleaner air that “our welders really notice and appreciate,” Roll says, “the new sys- tem provided a 3-yr. return on invest- ment based solely on reduced heat loss.”
Also significantly improved, notes Camfil APC specialist Jon Ladwig, is the amount of noise generated on the clean- air side of the dust- and fume-exhaust system. Ladwig and Camfil APC metal- working market manager Greg Schreier designed the system for Fast.
“The old horizontal-style cartridge unit,” says Ladwig, “not only was undersized but created a lot of noise, which can be very fatiguing in the tight confines of a factory. We installed a better silencer on the exhaust and opti- mized the design of the ductwork to minimize air velocity of the clean air reentering the plant. All of this added up to an effective solution—cost- and performance-wise—that keeps the air clean and the noise to a minimum.”
Low-Pressure-Drop Filters
When Fast cleared the air of its weld shop, it also tackled the tube-produc- tion area by installing another GS8 dust collector. Gold Series units feature ver- tically mounted cartridges with a cone in the center of the cartridge that, says Schreier, expands the amount of usable media in the filter by as much as 25 per- cent compared to other horizontal car- tridge-filter models.
“Fast also uses the new HemiPleat eXtreme fire-retardant media filter,” Schreier notes, “designed specifically for cutting and metal-dust filtration.
It further reduces energy use at Fast by operating with a low pressure drop, and achieves high filtration efficiency, to 15-16 MERV (minimum efficiency reporting value) rating.”
In 2011, Fast added a GS16 (16 fil- ters) dust collector to its plasma-cutting table (since removed from the factory floor), which, says Roll, “always had a haze nearby. With the new system, air quality in that building improved dra- matically. The same can be said of the GS6 unit installed with our newest flat- bed three-axis laser-cutting machine in December 2012, where we’re pulling cutting dust and fumes through a downdraft table.”
Filter Life
As if the improved environment and energy savings (all four dust and fume collectors allow warm, clean air to recir- culate back inside the adjoining build- ings) weren’t enough to justify its air- handling investment, Fast appreciates the low maintenance requirements associated with the new equipment— specifically, filter life.
“For example,” says Justin Herring- ton, the firm’s weld- and fab-shop man- ager, “Camfil recommends changing the filter on the system clearing the air from our tube laser once per year, but we ran it for 3 yr. before the gauge on the machine indicated that the filter needed to be changed. And in the weld shop, we expected to have to change the filters every 9 months, but they’ve lasted longer than a year.” MF
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