Passive House - Fresh Air System Install & Costs (Zehnder)

What people said

sd_mikey · 2022-09 · Recommendation

Matt Risinger explains how and why he put an ERV in his house in this episode of The Build Show [VIDEO] . It seems to be the thing to do of late in to help with air exchanges and still meet the passive house standards.

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throw0101a · 2021-08 · Reference

* Do try to get an HRV/ERV if you live in places where the outside air temperature gets >30C or <10C. Otherwise bring in fresh air will cause issues. * Make sure your system can handle MERV16 filters: they catch more things, but may create more back pressure, so the system has to be designed to handle it. Further nice-to-have upgrades would be HEPA capabilities, and (if you live in wildfire zones) charcoal filters (for smoke/fire smells). You don't have to (always) use the finer filters, but having that option is useful. * The filter should ideally be 4"/10cm, as they have more surface area, so reduce back pressure and often only have to be swapped every 6 months (sometimes even every 12). They do cost a bit more because of the extra material, but you get convenience. Don't go less that 2"/5cm though. * The mentioned Zehnder is a good brand, but AFAICT, are higher end systems, and so may be a bit more pricey: [VIDEO] [LINK] * Consider getting a separate whole house dehumidifier, depending on your climate: sometimes the indoor air temperature may be comfortable (20-25C), but if the relative humidity (RH) gets too hight (>60%) it will feel hot. But the AC won't run because its thermometer will say everything is fine. Temperature and moisture needs to be dealt with via separate mechanical systems.

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throw0101a · 2021-08 · Reference

Ah yes, it seems that the built-in stuff has restrictions, but there are external boxes that can be added: * [LINK] Which allow MERV 16 and even carbon filters: * [LINK] * [VIDEO]

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