MEPF Cambodia 92 Questions 38 Answers 7 Best Answers 9 Points View Profile 0 MEPF Asked: October 28, 20202020-10-28T05:04:49+00:00 2020-10-28T05:04:49+00:00In: MEP Questions What are the three types of ventilation system? 0 What are the three types of ventilation system? ventilation system Share Facebook 1 Answer Voted Oldest Recent MEPF Cambodia 92 Questions 38 Answers 7 Best Answers 9 Points View Profile Best Answer MEPF 2020-10-28T05:05:39+00:00Added an answer on October 28, 2020 at 5:05 am Different Types Of Mechanical Ventilation There are three types of whole-house mechanical ventilation systems: exhaust-only, supply-only, and balanced. Each system uses a combination of fans, ducting, dampers and controls, and they each have different pros, cons, and costs accompanying them. Exhaust-Only Ventilation Exhaust-only ventilation tends to consist of a fan, commonly a bath fan, exhausting indoor air. Outdoor makeup air is drawn into the house through leaks in the building’s enclosure. Pros/cons/cost: Contaminants may be drawn into the house from an attic, garage, crawlspace or wall cavity Possible to draw moist outdoor air into the wall cavity that could condense during the cooling season and cause moisture problems, particularly in hot and humid climates Can cause or contribute to back-drafting of combustion appliances Lowest installed cost and low operating cost Supply-Only Ventilation Supply-only ventilation consists of a fan drawing outdoor air into the house. Indoor air escapes through the building enclosure and exhaust fan ducts. Supply-only can be a dedicated system, or more commonly a central-fan integrated (CFI) system. With a CFI system, outdoor air is ducted to the return plenum of an HVAC air handler that draws in and distributes the outdoor air. Pros/cons/cost: Reduces contaminants entering through the building enclosure Outdoor air is drawn from a single, known location for best air quality Potential to drive moist indoor air into the wall cavity that could condense and cause moisture problems during the heating season in colder climates Low installed cost, however for a CFI system, the electronically commutated motor may increase the initial cost and operating cost may be higher Balanced Ventilation Balanced ventilation systems are a combination of exhaust and supply methods roughly providing equal indoor exhaust and outdoor supply air flows (e.g. an exhaust fan combined with a supply fan or passive inlet vents). A balanced system could include a heat recovery ventilator (HRV) or an energy recovery ventilator (ERV). Pros/cons/cost: An HRV transfers a portion of the heat between the exhaust air and the fresh air; an ERV transfers heat and moisture An HRV or ERV provides the benefits, but limits the drawbacks, of supply-only and exhaust-only methods Commonly, an HRV is recommended for dry, cold climates and an ERV is recommended for moist, warm climates Highest installed cost for HRV or ERV due to equipment and additional ducting There are pros and cons to each type of mechanical ventilation but one type may work better for your home than the other two. 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Save my name, email, and website in this browser for the next time I comment.