Blower wheel assembly

摘要: Various systems and apparati as well devices structures are provided which may be used or incorporated into air handling (e.g. (air) ventilation apparati) for the manipulation control of in a enclosure such building, room structure residence, like. Such systems) example include an element transfer heat from warm exhaust (taken inside e.g. building) to cooler exterior fresh (drawn building). The present invention further relates not only stale interior outside but desired necessary also intermingle portion with delivery intermingled back (during cold weather). particular exploit defrost defrosting system during cool weather.