Patent ID: 7458228

Claim:
A ventilation apparatus, for exchanging air between the interior and exterior of a building, and for transferring, a member of the group comprising i) sensible heat and ii) sensible heat and water moisture, between exhaust air taken from the building and fresh air taken from the exterior ambient air for delivery to the building, said ventilation apparatus comprising fresh air path means having a fresh air intake side and a fresh air discharge side, exhaust air path means having an exhaust air intake side and an exhaust air discharge side, an exchanger for exchanging, a member selected from the group comprising i) sensible heat and ii) sensible heat and water moisture, between fresh air and exhaust air, said exchanger means being configured and disposed so as to define a first air stream path and a second air stream path, said first air stream path defining a portion of the fresh air path means between the fresh air intake side and the fresh air discharge side thereof and said second air stream path defining a portion of said exhaust air path means between the exhaust air intake side and the exhaust air discharge side thereof, characterized in that said ventilation apparatus comprises first, second, third and fourth static pressure taps, said first and second static pressure taps being configured and disposed for the determination of a first static pressure difference there between in said fresh air path means, said first air stream path being disposed between said first and second static pressure taps, said third and fourth static pressure taps being configured and disposed for the determination of a second static pressure difference therebetween in said exhaust air path means, said second air stream path being disposed between said third and fourth static pressure taps.