To maximize the effectiveness of your Greentek HRV or ERV, attractive wall controls give homeowners many options from digital multi-functional designs to non-digital models that address specific functionality needs in user-friendly layouts. Push button timers allow 20, 40 or 60-minute high-speed operation for bathroom exhaust or other rooms that often require spot ventilation to minimize issues such as excessive moisture and annoying odors. Outside hoods in a variety of styles address ease of installation, tight spaces and maintenance concerns.