Patent ID: 6948553

Claim:
A heat recovery ventilation system comprising, in combination: a heat exchanger; and apparatus for causing air flow of fresh supply air and exhaust air to the heat exchanger to employ the exhaust air to either pre-heat or pre-cool the fresh supply air, said apparatus being of modular construction, spaced from the heat exchanger and comprising an enclosure defining an enclosure interior, said enclosure including an inlet portion having a supply air inlet opening and an exhaust air inlet opening and further including an outlet portion having a supply air outlet opening and an exhaust air outlet opening; a blower assembly; and connector structure releasably connecting said blower assembly to said enclosure with said blower assembly disposed in said enclosure interior, the blower assembly being in fluid flow communication with each of said supply air inlet opening, said exhaust air inlet opening, said supply air outlet opening, said exhaust air outlet opening and said housing interior whereby air flow of fresh supply air caused by said blower assembly passes seriatim through said supply air inlet opening, said housing interior and said supply air outlet opening and is delivered to said heat exchanger and whereby air flow of exhaust air caused by said blower assembly passes seriatim through said exhaust air inlet opening, said housing interior and said exhaust air outlet opening and is delivered to said heat exchanger to employ said exhaust air to either pre-heat or pre-cool said fresh air at said heat exchanger, said inlet portion comprising an inlet plate and said outlet portion comprising an outlet plate spaced from said inlet plate, said enclosure additionally comprising a shell having a shell top and two spaced shell sides connected to and extending between said outlet plate and said inlet plate and an access plate disposed under said shell top and extending between said inlet plate, said outlet plate and said shell sides, said access plate being selectively movable relative to the remainder of said enclosure to allow manual access to the enclosure interior from under said enclosure for removal and replacement of said blower assembly.