Passive House Standard - Heat Recovery Ventilation - Zehnder

zehnderamerica.com Most of us spend most of our time in buildings. With the Passive House Standard, there is a requirement for a high level of airtightness: 0.6 Air Changes per Hour. So how do we get quality and fresh air into our buildings? In this video we look at the mechanically controlled ventilation system; it's benefits and practical installation. For more information, contact Zehnder today by calling 888.778.6701 or emailing [e-mail]
Zehnder America Inc. provides high quality heating and ventilation solutions to promote comfortable, healthy, and energy-efficient indoor living. Zehnder America is a division of the Zehnder Group, headquartered in Switzerland. The Zehnder Group is represented worldwide and specializes in advanced heating, cooling, and ventilation technology.
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[@robertocorradi7571]

Number one - Amazed that nobody has left a comment ! . . . My thoughts are that this was extremely well presented with clearly defined information . Thank you very much .

[@datoming]

Thank you for clear presentation, Zehnder US. This has helped my understanding of my new "air recuperation" system being installed in my new house.
I have some thoughts & questions.
(1) The ventilation box being shown in this video is a huge-sized badass box while my Zehnder box is tiny in comparison and hangs on the wall of a small utility room on the ground floor. Viewers may not realise the size of the unit is depending on the living space of the Passive House (my new house is 2 storeys with 3 bedrooms, main bathroom on upper floor & 1 bedroom, 2nd bathroom, kitchen, open plan living, dining areas, small utility room on ground floor).
(2) Zehnder units are certified by Pass House Institute - I can expect the 90% efficiency in its heat recovery rating without any 12% deduction. How does this translate to the 25% heating cost saving, I wonder? I can only image the heat loss via wall, roof, windows accounts for the slide from 90% to 25%.
(3) What is the implication of opening a window in the bedroom in my new house, which my strong-willed wife insists that she may want to do so occasionally? This flies against the concept of a Passive House degrading heat recovery, dust filtering etc. in my view but I would you to recommend a good way, explanation to help encourage my wife to avoiding opening any windows.
(4) Without the optional fresh air inlet tower & the underground earth heat exchange ducts but a single fresh air intake vent on the external wall on the ground floor (near the utility room), should I need to have any security concerns about malicious access to the single fresh air intake vent by would-be intruders/burglars?

[@datoming]

I have just discovered the meaning of 90% recovery. A 100% recovery translates to zero centigrade fresh air being warmed up to the "same" warmer temperature of the stale at 20 degree centigrade (say), existing exhaust air. A 90% recovery means the fresh air is only warned up to 90% of the warmer temperature of the exhaust air or 18 degree centigrade. The heat loss through walls, windows, roof, ground is independent of the HRV's efficiency.

[@GoneOffTheGrid]

very helpful