Energy Matters: MHRV-mechanical-heat-recovery-ventilation-Vent-Axia-HR25H- 20

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(Energy Matters): MHRV mechanical heat recovery ventilation Vent Axia HR25H with humidistat being fitted to small bathroom 20 DHD.jpg
D=2011-12-21 [Dec 21, 2011]; S=4MB, 4000x3000; T=JPEG image [MIME:image/jpeg].

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mhrv = MRHV, HRV, mechanical heat recovery ventilation, mechanical ventilation with heat recovery, energy-efficient ventilation = Provides controlled ventilation (ie "fresh air"), while recovering and returning most of the heat from the building that would normally be lost with the stale exhaust/expelled air, with typical recovery rates being around 80%, thus allowing 1/5th the heat loss to maintain adequate ventilation over just leaving a window open for example. For cooling, 'coolth' is retained by MHRV instead. Can be automatically triggered/boosted by elevated humdidity or CO2, or occupancy, to further reduce energy consumption when not needed.