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How ventilation products and components actually work, and how to compare the technologies behind them: HRV versus ERV, heat exchanger cores, EC versus AC motors, filtration stages and controls. Written for distributors, specifiers, engineers and contractors who have to read a spec sheet and defend the choice.

How EC motor fans use less energy and when the higher cost pays off in continuous or variable-demand ventilation.

How heat recovery units work, how they save energy, and what to look for when choosing one.

How HRV and ventilation products improve indoor air quality by supplying fresh air, exhausting stale air, and recovering heat.

How a filter box works, the three filter stages (pre-filter, HEPA, activated carbon), where it fits in an HVAC or ventilation system, how to select one, and how to maintain it.

An air curtain, also …