Intelli-Balance™ 100 ERV, 50-100CFMIntelli Balance 100 Balanced Air Energy Recovery Ventilator, Customizable 50 100 CFM, Ceiling Or Wall Mount, MERV 8 Filter Included; Optional MERV 8 And MERV 13 Replacements Available Tightly built homes and buildings utilizing exhaust only fans can create negative pressure. Intelli Balance 100 solves this by supplying air to replace exhausted air, helping to balance air pressure within the home. Intelli Balance 100 ERV uses four integrated dual 4 or