Awards & Engraving

2018 Laser Engraving Report

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LER 2018 n 5 CHOOSE WISELY WITH THE HELP OF PROFESSIONALS Most people gravitate toward venting to the outdoors because it initially seems simple and cost-effective. It can be, but it still requires proper planning and engi- neering expertise to avoid unforeseen complications and costs, e.g. increase in power consumption due to the heating or cooling of make-up air and heating ventilation and air conditioning (HVAC) balancing problems. Make-up air is the air that enters a building in the amount equal to the rate of the air vented out of the building. The make-up air must be heated or cooled in order to maintain the desired room temperature. This leads to higher energy bills. Additionally, if the existing heating/ cooling system does not have enough capacity to treat the extra make-up air, it may need to be upgraded, which can be a costly investment. Venting to the outdoors can also adversely affect the balancing of your HVAC system. HVAC duct balancing ensures that the appropriate amount of air is reaching individual rooms so that not one room is too hot while another is too cold. When implementing a vent-to-outdoor solution, the existing ducts must be prop- erly re-balanced by installing and adjusting dampers or gates that control the rate of air- flow to each room. An unbalanced HVAC system also leads to excessive energy bills. The main benefit of venting to the outdoors is that there aren't any filters to replace because the contaminated air is sent directly outside. The compromise is that your energy bills increase. For example, two 32-by-20-inch laser engravers Figure 1: vent-to-outdoors diagram. Figure 2: recirculating fume extractor (RFE) diagram. continues on page 8

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