Download - ECCO Supply
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HOME Ventilation Guide Many ERVs look and operate very similarly to HRVs. An ERV not only conducts heat but also allows water vapor to pass from one air stream to the other. In cold weather, moisture is transferred from the exhaust air stream to the fresh air stream. In warm, humid summer weather, the ERV transfers moisture from the fresh air stream into the exhaust air stream, which the air conditioner has cooled. In both cases, this moderates the humidity from the extreme levels found outdoors. Selecting a model There are many different models of HRVs and ERVs, each with its own advantages and uses. To select the right model for your application, consult HVI’s Certified Home Ventilating Products Directory, available at www.hvi.org, which contains performance-testing reports for HVI-Certified HRVs and ERVs. Airflow is an important consideration when selecting an HRV or ERV, as the unit’s first function is ventilation. It is critical to select a unit suitable for use in the climate in which it will be installed. In cold climates, the unit’s frost protection must be sufficient “RECIRCULATION” IS NOT VENTILATION Ventilation is one of the most misunderstood parts of any central heating and air-conditioning system. Builders, contractors and homeowners alike may believe that the home’s ventilation needs are being met by the central forced-air system since it provides air movement and distribution. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) defines ventilation for indoor air quality as, “the process of supplying outdoor air to or removing indoor air from a dwelling by natural or mechanical means.” Traditional forced-air heating and cooling systems do not ventilate; they only recirculate the same air through the dwelling over and over again, controlling temperature but doing little to improve air quality. A large variety of excellent mechanical ventilation solutions is available, from single-point exhaust fans to balanced supply and exhaust systems with heat and energy recovery. Installation of HVI-Certified ventilation products will help to ensure optimum indoor air quality. to ensure that ventilation will continue throughout the winter. Other factors to consider include “sensible heat-recovery efficiency,” controls, type of defrost system and power consumption. To determine the best choice for your area, contact HVI member companies, which have many years of experience with HRVs and ERVs. Control options The controls for continuous ventilators range from simple to complex. Controls are available that permit variable ventilation rates, automatic high-speed operation (when bathrooms are in use, for example), automatic operation to control excess humidity, timed or proportional operation, and even air-quality-sensing. HVI member companies can provide detailed information to guide your selection process. ■ 24 circle 66 on reader service card H V G www.hvi.org
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- Page 3 and 4: IN RESIDENTIAL VENTILATION Contents
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